4/2 - 10:45pm - After Some Rain, a Warm Weekend in Mississippi

A stationary boundary stretched across Mississippi is giving folks to the south quite a bit of warm weather this evening but we're cooling down here in Starkville as we remain on the north side of it. An associated area of low pressure currently in Texas will move through the region later this week, triggering showers on Wednesday and Thursday. While temperatures will take a small tumble on those days we'll warm up vigorously into the 70's by the weekend. Check out your CampusConnect Forecast below for all the details!

1/23 - 7:15pm - Rainy End to the Week, Nice Weekend!

Tonight's low clouds aren't showing up well
on infrared satellite imagery.

After an evening of cool temperatures and a few clouds we'll be seeing a few rain showers setting in for the morning hours across the Golden Triangle and North Mississippi. These showers will be in advance of our next system that will bring us appreciable rain on Friday. But, how about the weekend? After this system moves out we'll have slightly cooler temperatures but at least the sunshine will be out in full force on Saturday. Temperatures will warm a bit for Sunday before we see more rain just in time for the new work week. Your full forecast is available in the CampusConnect video below!

12/30 - 8pm - Anyone Up for a Third Round of Wintry Weather?

With two winter weather events within a week's time in the books for Kentuckiana, it's apparently time for a third! Unfortunately the timing for this one is pretty bad. Just as folks are going home from New Year's parties in the early hours of Tuesday morning we could have snow, sleet, or even freezing rain falling in the region. The good news here is that regardless of what falls from the sky, there won't be much of it. Precipitation amounts will remain light since heavy rain and storms in the South will be stealing our moisture here up north in Kentucky and Indiana during the time of the event. As far as timing goes, a few snow showers will move through tomorrow afternoon as this system begins to move toward us. Going into the evening is when things get tricky.

As a weak area of low pressure continues to approach we'll see some warming aloft out ahead of it. This warming has the potential to turn our falling snow into sleet or even freezing rain. The GFS is leading the charge at the moment on the potential for freezing rain in Louisville as it has a layer above freezing from 4,000 to 7,000 feet at 4am on Tuesday morning that would support freezing rain. The NAM model keeps us all snow with the entire atmosphere being below freezing. Given that the models have overestimated temperatures aloft with the past two snowstorms we've seen lately, I'm inclined to think that Louisville will stay mostly or all snow. Another thing to focus on will be surface temperatures. Should they be just below freezing this snow, sleet, or freezing rain will stick to the roads and make for tricky travel on late Monday night. If they're just above freezing then only expect to see accumulation on the grass and elevated surfaces. We do have a bit of snowcover in Louisville now, so that might lean us more in the direction of below freezing instead of above for this event overnight Monday into Tuesday. We're going to be awfully close to freezing for much of the night regardless. Areas north of the city will likely stay all snow and below freezing while those areas to the south will see a wintry mix and temperatures just above freezing until the early morning hours. National Weather Service offices across the Plains have issued Winter Weather Advisories due to this system, in purple on the image to the left, but uncertainty about precipitation type and amounts in the Ohio Valley has NWS Louisville waiting for more agreement before they issue any advisories.

Like I said before, accumulations are going to be light for this event. The NAM (right) has up to an inch of snow in many areas and the GFS model has been a little more optimistic at times today with 1-3" across the area. Like the last two snow events, I'm thinking that the amount of precipitation being put out on the models will adjust upward a bit as we get closer to time (tonight and tomorrow morning). Given the trends I'm seeing right now I think we'll see 1-2" of snow in portions of Louisville and points northward with up to an inch of snow and mixed precipitation to the south. Once again... grumble grumble grumble... Louisville is right on the line between feast and famine with the snow. Southern Indiana has been the big winner with snow over the past week while folks south of the Ohio River are raising their hands in favor of more. That is, if you're a snow lover of course. So, we'll be looking to see over the next few hours how the models handle the amount of precipitation forecast, and temperatures both aloft and at the surface. Shifts in these could mean some significant changes to the forecast for many areas!

12/21 - 2pm - I'm Dreaming of a White (Day After) Christmas

How about that snow last night around Kentuckiana? Most places saw a dusting but areas in Southern Indiana near Orange County picked up about 3 inches since a snow band set up there for a few hours during the overnight. Here at my house in Southeast Louisville we picked up a dusting of snow that blew around a bit in the wind. Temperatures today aren't going to make it out of the mid 30's in Louisville today thanks to the cold air behind the front that passed through yesterday. Seems appropriate given that it's the first day of winter!

Temperatures will moderate for the weekend with southerly flow returning but an area of low pressure moving through will bring rain and even warmer temperatures for Christmas Eve. Booooo! Luckily Christmas Day isn't looking like a washout with just a few clouds and highs in the lower 40's. That's a different story further South in Mississippi, Alabama, and Georgia where rain will be setting up.

Now... onto the fun part. Over the past couple of days the forecast models have been jumping onto the idea of an area of low pressure moving from the Gulf states to the western side of the Appalachian Mountains the day after Christmas. This is concerning because this track favors a snow event for Kentuckiana and even some of West Tennessee. You need to be on the north and west side of these low pressure systems if you want to see some snow since that's where the cold air is confined to. The past few systems we've been on the south and east sides of the lows moving though so that has meant thunderstorms and warm weather lately.

The latest 3 runs of the GFS for this particular post-Christmas storm have been fairly consistent with the low track, which is good! The problem has been that there's been trouble determining how much cold air there will be to work with and how strong/large the low moving through will be. These issues have affected how much snow the Louisville area gets. The graphic on the left is a comparison of the last 3 runs of the GFS for December 26th. For entertainment purposes only, the 0z run had just shy of 8" of snow for Louisville, the 6z had about 3", and the 12z had around 2.5". It is still way, way too far out for specific totals and to worry about the cold air issues yet since things will change likely on the models between now and then. I will say though that the 6 and 12z runs seemed to have difficulty keeping the low as a single, compact system once it matured and instead wanted to go with an elongated large low that tries to interact with another low that develops east of the Appalachians. I've seen this kind of thing happen on the GFS earlier this year with the Nor'easters that we had. Eventually, based on what happened with these Nor'easters, these elongated lows should give way to more concentrated, compact lows on the GFS as we get closer to the actual event. This should help to clear up some of the murkiness with the cold air issues too.

The Euro has been fairly consistent with the track of the low as the GFS has been, but has also experienced a few issues of its own like the GFS. Yesterday's 12z run of the Euro had a blockbuster snow event in the Louisville area while the 0z last night backed off on that prospect thanks to, you guessed it, a more elongated low and trouble with cold air. I can't post the precipitation output from the Euro model since it's behind a paywall and copyrighted, but I can at least show you what the 0z run did with the low after it moved through. Lots and lots of cold air will be behind this system if you couldn't tell by the deep blues and purples on the map!

UPDATE 2:20pm - Today's 12z Euro model run is in and it has a blockbuster storm track for snow for us here in Kentuckiana and West Tennessee. That is quite a strong low in East Tennessee on the left-hand map compared to previous runs. Sheesh.

The CMC and the JMA, which are the Canadian and Japanese models, aren't worth showing here right now. The CMC has the storm running off the east coast and the JMA has a nice low track for some snow in Louisville. It's worth noting that this system might disappear all together on the models or make a radical change. It's still too far out for much certainty.

Also, West Tennessee may see snow from this storm should it take the track that we're seeing. It wouldn't be much snow but certainly more than an inch or so isn't out of the realm of possibility, especially in Northwest Tennessee. Once we get closer to time this will become a bit more clear.

The NAO, which is the North Atlantic Oscillation, frankly isn't agreeing that there will be support for this storm. A negative NAO means blocking near Greenland allows for cold air to flow into the Eastern US and stay locked in place. The current forecast is for a positive NAO during this time, but it has been flipping between negative and positive over the past couple of days. This storm doesn't have to have a negative NAO to happen, but it would help to have it for cold air support and for a storm track that rolls up to the northeast. This will, like the aforementioned models, sort itself out over the next few days.

 

Finally, NWS Louisville has been on board with this storm since yesterday. They're being cautious like they should be but mentioning at length the potential for this at 5 days out is something that they don't do very often. Here's their latest statement:

A much more significant weather system will arrive on the 26th. Both the 00z GFS/ECM and ensembles track a strong low pressure system just to the west of the Appalachian spine which may set us up for our first significant snow. If the low pressure system takes its current forecast track, precipitation would enter the area Wed morning with the bulk of precip occurring Wed during the day and then exiting late Wed night or Thurs morning.

Although there is still much uncertainty in the track of this weather system 6 days out, the possibility is there for significant snow based on the low track and anticipated thermal profiles. BUFKIT GFS showed 8 inches at SDF with a little more than 0.5 inch of qpf. The soundings denote a classic heavy snow sounding with subzero and deep isothermal layer super saturated. The synoptic features of interest are a 110 kt jet max entering a the base of a deepening trough.

For now will have 60% pops on the 26th with rain in the morning and then snow in the afternoon and Wed night. Bing Crosby`s I`m dreaming of a White Christmas may happen, just 24 hours later.

Stay tuned for upcoming forecast updates as this weather system may put a kink in holiday travel plans.

 

This will be a fun system to watch over the weekend. Hopefully there's some snow in our future!

 

12/11 - 10:30pm - Be Careful When Wishing for Snow... You Might Get it!

With all the warmth much of the eastern portion of the nation has been experiencing lately some folks are beginning to get antsy over whether we'll be able to fall into a more winter-like pattern in time for the holidays. The cold front that rolled through earlier this week has helped to assuage some of those fears as it brought much cooler temperatures and even some light snow/sleet to parts of Kentucky and Indiana.

So... What's next? First up is a system that will move through the region this weekend as a warm one. A low will travel from the Plains to Lake Michigan and keep the eastern half of the nation warm as it spreads rain from the Great Lakes to the South. This makes sense because the North Atlantic Oscillation (NAO) will be going neutral during this time, which generally means that cold air won't be able to spill down into the Eastern US from Canada. The Arctic Oscillation will be negative to support cold air coming out of the north, but that doesn't matter too much for us when the NAO isn't negative as well.

The system behind this weekend's is the one that is drawing some concern. A low will be moving across the South during the day on Tuesday and potentially spread some snow to areas that are north of it. At this point anywhere from West Tennessee to the Louisville area is in a potential corridor for snow. This all depends on the exact track of the low and how much cold air it will be able to bring down from the north. This scenario is supported by the NAO and AO both going negative during this time. The GFS model takes the storm along the southern border of Tennessee right to the Carolinas. The ECMWF (European) model starts out with the low a little further south along the Mississippi River but has it exit off the coast in about the same location as the GFS. The low would then become a storm that would ride up to the Northeast just off the coast. With the previous system pulling up toward the Chicago area, this low will likely stay suppressed to the south. So... the broad, general nature of this low's track isn't in too much question. My preliminary (read: subject to change!) thinking is that this will be a rain to light snow situation for portions of Tennessee and Kentucky since cold air would plunge in as the system is exiting to the east. Accumulations would be very light to none.

But here's an issue. The snow cover over the Northern Plains and Upper Midwest has expanded tremendously over the past week as a storm pummeled those areas with quite a bit of snow. We're now at 31.4% snow cover over the United States. Air moving from the north over that snow won't warm as quickly as it would over bare land and the computer models generally have a difficult time resolving that. With this snow cover, the air in place over us and the air coming down from the north may be a little cooler than the computer models think it will be at the moment. That could mean more snow from this system. We're still a week away from this event so while details are sketchy, it's now obvious that this is a system to watch. This likely won't be the only storm we'll have to contend with between now and the new year since a pattern is setting up that will allow cold air to sit close by to the Ohio and Tennessee Valleys while lows track through and just to the south of the region. There's hope for a white Christmas in the region but it will depend on whether we can get enough cold air and a storm to move through just before the 25th. It'll be fun to watch!

5/10 - 11:20am MDT - A Change in Plans Today

Our original plan to stay in Southeast New Mexico today has been altered because of some new weather data that came in overnight. We did visit Calsbad Caverns this morning, but we're now on our way to the Del Rio, Texas area where storms are ongoing at the moment. This activity is definitely not making it easy for our forecast this morning because having clouds and storms in the hours before an afternoon severe weather setup is never a good thing. Nonetheless, we'll be looking for holes in this activity and/or for it to die off a bit this afternoon so that stronger storms can develop. The good thing is that wind shear today looks promising due to a cut-off low in Mexico creating strong southwesterly winds aloft that will contrast with the easterly winds at the surface.

The Storm Prediction Center has issued a Slight Risk for severe storms in the region, which includes a 5% tornado risk. Should this pan out today even with the ongoing storms this morning, this could be the best setup we've seen so far this week. Here's an interesting snippet from the SPC's 1630z discussion:

THE EWD PROGRESSION OF MID AND HIGH-LEVEL JET STREAKS ACROSS THE LOWER RIO GRANDE VALLEY WILL RESULT IN PRONOUNCED VERTICAL VEERING OF WINDS WITH HEIGHT WITH EFFECTIVE BULK SHEAR STEADILY STRENGTHENING TO 50-60 KT. AS SUCH...THE ENVIRONMENT WILL BECOME INCREASINGLY SUPPORTIVE OF INTENSE SUPERCELLS CAPABLE OF VERY LARGE HAIL...TORNADOES...AND DAMAGING WIND GUSTS.

Up-to-the-minute updates will continue today on Twitter and Facebook.

5/5 - 11:55pm CDT - Interesting Setup Tomorrow

A cold front moving through the Plains tomorrow will provide the focus for severe storm development during our first chase day. This front has really slowed down on the computer models over the past day or so and this is good because it will allow the warm sector environment to to east of it to become richer with potential due to solar heating. Something the NAM model has been consistently picking up on is the development of a small, sharp shortwave moving through Oklahoma during the afternoon. This shortwave generates a secondary low on that model that creates some pretty good directional shear over Central Oklahoma. Couple that with some incredible instability due to the high moisture in the area and you've got an interesting little severe weather setup to chase. This setup has shifted around from North Texas to East Kansas over the past few model runs, but it seems to be stabilizing over Central Oklahoma for now. The tornado risk tomorrow originally looked very slim due to the lack of good wind speed aloft, but now it is becoming hard to ignore the good directional shear and the great instability. So while it still isn't a high tornado risk, I would venture to say that one or two may touch down if indeed this area of good directional shear sets up.

I'll have an update tomorrow morning on how the setup has evolved and where we'll be targeting. Follow my up-to-the-minute updates on Twitter and Facebook.

4/18 - 9pm - Rainy End to the Week?

Low off the Gulf Coast on Saturday

After seeing well over three inches of rain yesterday in Starkville we're enjoying much more pleasant weather that's going to continue over the next few days. Southerly winds will be bringing moisture and temperatures near 80 for both Thursday and Friday, but the weekend is a question mark at the moment. Our next system tracking to our south will be sending up rain our way for a good portion of the day on Saturday, but the most recent computer forecast model runs suggest this may be less of an issue than previously thought. Should that system stay well enough south and not send as much moisture our way, Saturday may be showery but not a washout. Sunday should be much cooler regardless but at least the sunshine will return! Your full forecast is available in the video below:

3/22 - 4:30pm - Heavy Rain is Gone, but Warm Temps Remain!

Heavy Rain

Did you get drenched? I think we all did. The rain over the past 24 hours has been tremendous, especially across Mississippi as inches and inches have fallen from the pesky system that has been slowly churning through the Plains and now the South. Check out the estimated rainfall map from today below to see what I mean (the totals for West Tennessee are underdone but you get the picture of who saw some tremendous rainfall earlier today!) Most of the rain is now east of West Tennessee and North Mississippi, but a few showers remain and will continue this evening.

More rain will fall tomorrow afternoon as another piece of energy from the same system rotates around the Mid-South. The area in red with the directional arrow coming from it is called a vorticity max. Usually the area where rain and storms develop is east of the vort max as it moves along. Tomorrow's rain won't be as heavy as today's by any stretch of the imagination and it will be more of a scattered nature than today's washout. Once this rain is all said and done by Saturday morning we should be left with a very nice weekend and temperatures warming back up through the upper 70's across West Tennessee and North Mississippi.

The Big Picture

Let's zoom out more and look at the system that's been causing all of this rain as a whole. What we have is an upper-level low in the Plains that is slowly moving eastward. An upper-level low like this one is basically a ball of cold-air that gets cut off from its northerly source because the jet stream kicks north leaves whatever is in the base of the former trough behind. It moves slowly because the jet stream, which usually drives big weather features, is absent from the process after the low gets cut-off. The satellite and radar images coming in from area where the low is are striking... you can see very well the rotation of the low pressure center, which makes it look like a land-based hurricane.

The jet stream being way up north is also why it's been so warm lately. In the winter the jet stream usually dips down from Canada and brings cold air to the USA. Areas north of the jet stream remain cold due to the influence of an arctic air mass while to the south of it there is usually a warm, moist air mass. This winter and now into this spring the jet stream has not really come down from Canada to the eastern half of the nation. The West has had it come down a few times though, which meant snow and cold temperatures for the Pacific Northwest and even down through California. The reason the jet stream stayed so far north is that La Nina (colder than usual ocean temperatures off the coast of Peru) remained pretty consistent throughout the season. In an El Nino pattern, the jet stream comes down to the US with a vengeance.

Record Warmth

The above-average temperatures from this pattern will persist for quite a while it looks like. A cursory glance at some of the long-range models shows that the jet stream will remain somewhere close to this northerly position for the foreseeable future. With that said, comparing this year and month to years past is incredible. This March so far has been the warmest on record in Jackson, TN and Tupelo, MS and the second warmest in Memphis. Jackson is running 10.6 degrees above average for this March. Comparing the year so far to years past, this is the warmest year so far in Memphis and Tupelo, and the second warmest so far in Jackson. These are remarkable numbers and we'll likely see more of these records flash by as the warmth continues. A running list of how this year's heat compares to previous records is available from NWS Memphis.

10/10 - 1pm - A Few Showers Around Mississippi

Moisture from the area of low pressure over Florida is providing us with a few rain showers across Mississippi today. These will likely continue throughout the day and taper off tomorrow. Not everyone will see rain, but don't be shocked to find a few raindrops falling at your location this afternoon. A cold front will move through on Wednesday evening and increase the potential for a few showers and storms, but after that point we'll see cooler temperatures and sunny skies as we head into the weekend. Check out the video below for more details:

2/1 - 4:30pm - MSU Forecast Video / No Severe Weather Here!

We dodged a bullet here in Starkville today in terms of severe weather. High winds aloft, adequate shear, and optimal low pressure placement all came together today, but a lack of atmospheric instability prevented a severe weather outbreak from occurring across North Mississippi. While they did have some severe storms in South Mississippi, things certainly didn't get out of hand and heavy rain was the only problem across much of the state. We'll clear out the clouds and usher in some cooler temperatures tonight and tomorrow, and maybe even see some light wintry precipitation on Friday. Things will be warmer for the weekend! Check out my MSU weather forecast video below:

12/10 - 12:30pm - Crazy Weather on the Way in Louisville!

I'm back home in Louisville after a long drive from Mississippi last night. My third semester at MSU is over after going through my final exams and now it's time to move on to more important things, like a potential accumulating snow here in Louisville this weekend!


The Latest
The computer forecast models have had a very difficult time trying to forecast this weekend's storm across the Upper Midwest and Ohio Valley. Earlier this week there were vast differences in where the low pressure center of this storm would track. Some models had the low moving into central Tennessee or central Kentucky before cutting northward to Ohio/West Virginia, and others had it moving into Wisconsin, Illinois, and Indiana before cutting north to the Great Lakes. The Tennessee/Kentucky track is the one that would give Louisville a snowstorm, but it appears a more northerly track will take place. The HPC's (Hydrometeorological Prediction Center) depiction of the northern track is on the right image. Luckily, for you snowlovers out there, this is not the end of our snow chances for this storm here in Kentuckiana!

As the cold air behind this storm catches up with the back end of the rain we'll see on Saturday, we may see a brief burst of wet snow on Saturday night. Then, light snow will wrap around the back end of the storm and impact us from the north on Sunday, possibly into Monday. By the time this is all said and done, I think Louisville will have 2-3" (isolated 4") of snow on the ground with lower amounts south and higher amounts north of here. The 6z GFS model seems to be picking up on these totals well and I've posted its forecast snowfall accumulation map to the left. You can click the image for a larger view if needed.

Here's what the National Weather Service in Louisville says about all of this:

THE COLD FRONT LOOKS TO PUSH THROUGH THE AREA SATURDAY EVENING BEFORE MIDNIGHT OVER MOST LOCATIONS.  DEPENDING ON HOW FAST THE COLD AIR CAN CATCH UP TO THE PRECIP...THERE MAY BE A BRIEF CHANGE OVER TO SNOW ESPECIALLY IN THE BLUEGRASS BEFORE WE GET INTO A BRIEF DRY SLOT EARLY SUNDAY MORNING. WRAP AROUND LIGHT SNOW WILL THEN PUSH THROUGH THE AREA ON SUNDAY.  LAKE ENHANCED LIGHT SNOW WILL CONTINUE SUNDAY NIGHT THROUGH MONDAY BECOMING MORE CONFINED TO OUR SOUTHEAST INDIANA COUNTIES AND THE BLUEGRASS BY MONDAY AS MOISTURE SLOWLY PULLS AWAY FROM THE REGION.  TOTAL SNOW ACCUMS LOOK TO BE BETWEEN 1-3 INCHES FROM SAT NIGHT THROUGH MONDAY WITH THE HIGHEST ACCUMS EXPECTED OVER SOUTHEAST INDIANA AND THE BLUEGRASS REGION.

Even though we have a general track somewhat ironed out now, there are a couple of details that could increase our snow totals. While the GFS/ECMWF (European)/NAM/CMC models all generally agree on a northern track to this storm, the UKMET model is still taking a more southerly track near the Ohio Valley. At this point I think it's an outlier solution, but nevertheless there is a sliver of a chance that the low could take a little jog southward and impact our snow totals. There's also a chance that a secondary low could form well to the south of the primary storm and the implications of that are pretty substantial on our snow totals. Chances for that look slim as well as most computer models either don't have it or get rid of it before it exits Texas. Again, these are just a couple little things to watch that could affect us if they come to fruition by some outside chance.

As if the snow wasn't enough, we'll also have to contend with gusty winds of 25-35mph on Sunday which will blow the drier snow around and create visibility issues. Temperatures will also plummet during the storm as a cold front comes through, meaning we'll see highs only in the 20's for Sunday and Monday here in the Metro. Factor those chilly temperatures in with the winds and you've got yourself below zero windchills. That's dangerous weather in itself... stay warm out there!

I'll be posting updates on my Facebook and Twitter accounts today if there are any updates.

11/15 - 10:30am - Great Weekend at WBBJ

This weekend was quite busy for me as I did weather for the 6pm and 10pm Saturday shows on WBBJ in addition to the morning show that I appear on. It was good experience to work both morning and evening shifts on the same day and it was actually pretty fun! The forecast was a little tricky in Jackson for this week because of a stationary front and multiple areas of low pressure riding up over the South that the computer models did not want to be consistent with. Check out the videos below of my morning, 6pm, and 10pm newscasts:

11/2 - 4:30pm - Rainy Days Ahead

The rest of today and tomorrow will be pretty rainy as a warm front just to our south keeps pumping in the moisture and lift needed for rainfall. Temperatures will take a nose dive after Thursday as the moisture clears out of the area and cool north winds take hold. Expect overnight lows to be in the 30's by the time the weekend rolls around. Check out the video below for more details:

10/26 - 5pm - MSU Weathercast / Severe Weather

We're under a Tornado Watch in Starkville until 7pm tonight as a cold front continues to kick up a few severe thunderstorms around North Mississippi. We've been lucky enough to miss the bulk of the severe weather here in Mississippi, but areas in Alabama, Tennessee, and Kentucky have been dealing with wind damage and tornadoes throughout the morning and afternoon today. As this record-breaking low pressure system in Minnesota begins to weaken and move off to the east, weather conditions will improve across much of the East and we'll see the return of sunny skies and cool temperatures here in Mississippi. Check out my latest MSU forecast video below:

10/23 - 1:30pm - Today's WBBJ Video

There's quite a bit of weather to talk about today after what seems like an eternity of drought and clear skies. A shortwave (small trough of low pressure) will advance towards West Tennessee over the next couple of days, resulting in increased chances for showers and thunderstorms on Sunday and Monday. Some of those storms Sunday night could be severe, especially across East Arkansas, North Mississippi, and extreme Southwest Tennessee. Another shortwave and cold front will cross through the area on Tuesday, giving Jackson and surrounding areas another shot at some strong storms. That's good news though... We need the rain! Check out this morning's video from ABC 7 in Jackson below:

12/28 - 2pm - A Difficult Snow Forecast

Hope that everyone in Louisville enjoyed the dusting of snow that came last night. Here's a little 6-inch snowman I was able to put together as the snow was falling:


The New Year's snow chance is still on the maps. The computer models are having difficulties trying to hammer down a track for this storm, but I think we may have a shot at 1-4" of snow. The precipitation amounts are different on all of the models right now, so that's about the best estimate I can offer at this point.

The 12z NAM run is a little warm for us in Louisville, but the track of the low is sufficient to generate a good snow around here if temperatures cooperate. There's a coastal low that may form as well, and that could impact how much precipitation we receive and the storm track.

The 12z GFS run is similar to the NAM, but the low is further east by a few miles. This helps to lower our temperatures a little bit, so we wouldn't have as much rain before the precipitation changes to snow. That coastal low shows up on the GFS as well.

The 12z ECMWF (Euro) is difficult to read because of the large time difference between frames this many days out, but you can see that it favors the low pushing further east and pushing off the coast.

Here's what the NWS in Louisville says about this system:

SO...WHAT KIND OF PRECIPITATION WILL IT BE? THAT IS A DIFFICULT QUESTION TO ANSWER AT THIS TIME. TAKING OUR BEST SHOT...FOR WEDNESDAY THROUGH THURSDAY IT LOOKS LIKE THE NORTHERN SECTIONS OF THE AREA /SOUTHERN INDIANA AND NORTHERN KENTUCKY/ COULD SEE PRIMARILY SNOW WITH SOME RAIN MIXING IN DURING THE WARMEST AFTERNOON HOURS. CENTRAL PORTIONS LOOK TO BE A RAIN/SNOW MIX...AND SOUTHERN KENTUCKY SHOULD SEE MOSTLY RAIN WITH SOME SNOW MIXED IN WEDNESDAY NIGHT.

....

CANNOT SAY WITH CONFIDENCE YET JUST HOW MUCH SNOW WILL FALL...BUT IT DOES LOOK LIKE ACCUMULATING SNOWS WILL BE POSSIBLE LATER THIS WEEK JUST ABOUT EVERYWHERE. STAY TUNED.

From what I've seen, I think we may start with a period of light rain on Wednesday evening as the low approaches the area. Cooler temperatures should filter in and change everything to snow by late Thursday as the low moves to our east. How much snow falls on Thursday and Friday will be determined by the track of the low as it moves northward. If this storm rides up the west of the Appalachians, expect more snow than if the storm moves out to sea or if the coastal low overpowers it. I still say this will be a widespread light snow event, but there's still quite a bit of wiggle room for precipitation amounts and storm track at this point.

12/26 - 2:15pm - Still Watching for New Year's Snow

I hope that everyone had a wonderful Christmas yesterday and that the lack of snow around here didn't get anyone down in the dumps.

As we shift our focus to the new year, we may also have to shift our focus to a chance of snow in Louisville. Over the past week, the long-range GFS computer model has been showing a storm tracking through the Gulf states. While the moisture and precipitation with this storm has been suppressed to the south on most model runs, I'm starting to see the (this) season-typical northward trend in the track of this storm.

The Euro model has this storm tracking from the Gulf Coast to Virginia, which would be a fairly decent track for us to have snow in Kentuckiana if enough moisture accompanies the storm. My worry is that there may not be enough cold air in place to counter the warm air being brought north by the storm, and this may negatively affect our snow chances. It's still too early to tell if this will indeed be a problem, but at least the storm track is good at this point.

Basically, the graphic from the last post with the potential storm tracks of this system still applies. There are a lot of factors like phasing, the polar vortex, and model-to-model differences that need time to get hammered out. I'd say this is our best chance for snow so far this season, and I think this is certainly a system that bears watching.

12/19 - 12:15pm - Update on Snow Chances

Snow did not fall in the Louisville area this morning as forecast because of warmer than expected temperatures both near the surface and just a couple thousand feet aloft. The short-range RUC model runs have been indicating a slow cool down of temperatures over the next few hours, so rain should change to snow later this afternoon. We may pick up a half inch on the grass tonight with any lingering snow showers.

The Christmas Eve snowstorm is having a very difficult time on the computer models right now. The most current 12z GFS run has mostly rain for us because the low cuts up to Chicago, but the previous few runs had been indicating a track just south of Louisville that would give us rain to snow or all snow. With solutions varying wildly from run to run, I don't think we'll have a track narrowed down until the start of next week. I will say that the pattern favors the southern track with snow for us because of high pressure in Canada suppressing any northward movement of the storm. The storm should be following this rule on the models, but unfortunately this is not happening with many of them. At least we still have a chance for snow! Here are some potential storm tracks that the models have been hinting at for the past couple days:

12/12 - 11:45pm - Looking for Snow

I know many of us here in Kentuckiana are waiting for the first big snow of the season. While we generally don't see much snow around Louisville in December, the pattern right now in my opinion is very ripe for an early season snowfall. The long range computer models (GFS & Euro) heat things up this weekend and early next week, but temperatures quickly turn downhill again by the middle of next week. We may even see a small bit of snow next weekend with a possible clipper system. The southern storm track, the one that brings most of our snowfall, has been and will continue to be very active throughout the arrival of this new batch of arctic air next week. Receiving snow in Louisville is all about timing, which means we have to have an abundance of cold air in place as a low pressure system tracks to our south and east, preferably along the mountains of Eastern Kentucky. Having one of these components out of place would mean rain or ice for us here in Louisville.

Many have asked: Does it look like we'll have a white Christmas? The answer is maybe. The possibility for light snow between now and the 25th looks pretty good right now, but getting a big storm in here will be tough. The GFS computer model has been hinting at some sort of snow event around Christmas for a couple days now, but accuracy that far out is very low. I'd say our chances for a white Christmas are probably the best since 2004, when we had a crippling snow/sleet system dump over a foot of snow in Louisville and Southern Indiana on the 22nd and 23rd of December. Just keep in mind that the pattern is ripe for snow, but that the specifics are blurry at this point.

If you're desperate to see some snow, head across the Ohio River to Paoli Peaks in Southern Indiana. They've been able to generate enough machine-made snow to open for skiing this weekend and they should be able to keep that snow on the ground through the warm spell we'll see early next week. Guess it's time to hit the slopes!

[Courier-Journal | "Paoli Peaks to open for skiing early"]