1/20 - 2:45pm - Bitter Cold Air is Arriving Soon!

Temperatures in the 30's were common last night in West Tennessee and North Mississippi but temperatures are poised to drop much further than that tonight. A dry and relatively marginal cold front is moving through West Tennessee right now and that cold front is the first of two cold shots for the region. This will put lows down into the mid 20's in West Tennessee and lower to mid 30's in North Mississippi as cold air pours in behind the front. This cold air won't allow temperatures to rise much during the day tomorrow either, with highs in the upper 30's closer to Jackson, TN and closer to 50 down toward the Golden Triangle in Mississippi.

During the day tomorrow the second of two shots of cold air will pour in as another cold front passes by. This one will bring the über cold weather that we'll see on Monday night and Tuesday morning. The winds behind this front will be out of the north, meaning the source region (AKA where the air is coming from) for the cold air we'll see during this time will be in the Upper Midwest where they'll be below zero. While that kind of cold isn't expected, mid to upper teens will be common in West Tennessee with readings closer to 20 or 25 degrees down toward North Mississippi. A low of 16 or 17 degrees in Jackson, TN on Tuesday morning looks pretty reasonable given the intensity of the cold air spilling down. While our neighbors to the north may scoff at this being branded as "bitterly cold" in the South, this is still some incredibly cold air. Pets will certainly need to be inside during this time and people need to be bundled up as much as possible. Limit your time outside on Tuesday morning, if possible, and be sure to cover any exposed skin if you do have to be out. Temperatures during the day on Tuesday will warm to a more reasonable lower 30's in West Tennessee and lower 40's in North Mississippi.

Temperatures will moderate during the week thanks to the return of wind flow from the south. This return flow means more moisture in the air across the region. You might guess that this warmer air and more moisture will eventually lead to rain chances... and you'd be right! A low pressure system and associated upper-level shortwave disturbance will track through near the end of the week, bringing rain chances. There's some disagreement between various models over whether this will start on Thursday or Friday. The GFS model's timeline on this is posted below. My guess at this point is that the timeline you see below will be delayed by about 12 hours, so expect rain chances to creep into the region ahead of this low on Thursday afternoon and continue through the night into Friday.

It's not out of the realm of possibility that a little bit of wintry precipitation may fall on the backside of this system on Friday. If cold air flows in behind a cold front associated with this system fast enough then some of the last few rain showers could mix with or change over to a brief period of snow. The GFS identifies Kentuckiana as being the prime target for this but we all know that model has been trending too warm lately in all the winter weather events we've dealt with. So in my mind, West Tennessee is in a potential area for this mix or snow switchover to occur. We're too early for specifics on this so the forecast will have to be fine-tuned during the week. Stay warm!

8/19 - 6pm - Tranquil Weather for the Workweek

Mississippi State University

It's that time of year again when I switch over blog post content to cover Mississippi and West Tennessee in place of the Louisville area. I do this for two reasons: 1) It's difficult to write about the day-to-day goings on of weather back home in Louisville when I'm taking a full college course load at Mississippi State that requires me to keep up with and forecast weather for the Golden Triangle area here in Mississippi and 2) I'm convinced that it is better to forecast for the area which you are currently living in because you're always aware (sometimes painfully) of how accurate your forecast is. If anything significant happens back home in Louisville I'll be sure to include it in my posts here over the next few months, but for now I'll be covering weather down here.

While it was supposed to be a rainy day across the Golden Triangle today we actually saw quite a bit of sunshine and nice weather. A front that has become stationary over Central Mississippi put us in a much drier environment and this has cut off most of the needed moisture for showers and storms to fire up. There's still a chance that a few isolated showers and storms will get going around the region but that's a potential that will be highest during the early morning hours according to the latest short-range guidance.

The trough that's brought us the front and the cooler temperatures this weekend will continue to do so for most of the workweek as it slides slowly eastward. A lack of surface moisture and building surface high pressure will stave off rain chances and even clouds for the most part until we get close to the weekend. Temperatures this week will be gradually rising through the mid 80's for highs until we get to Thursday. By then stronger southerly flow will be bringing in warmer, moister air from the Gulf and get us back to around 90 for highs as we go through the late week and the weekend. Shower and storm chances will be returning by the weekend.

Click image to see a larger view

The tropics have been fairly quiet as of late near the US coastline but there's potential for that to change next week. A disturbed area of weather in the middle of the Atlantic Ocean is on a course that may take it toward the East Coast if the latest computer models are to be believed. It's way too early in the ballgame to discern whether or not this will be a threat to the US since it could curve back out to sea before hitting land or not strengthen into a tropical storm or hurricane. This will be something to keep a close eye on since it could become Tropical Storm Isaac.

8/9 - 2:15pm - Severe Storm Threat Tonight

Small storms are popping up around the Louisville area after a fairly calm night that featured a few storms in Southern Indiana. The same trough of low pressure over the eastern half of the nation that's generating today's storm activity will see a potent burst of energy round the base of it late this evening into tomorrow morning. This piece of energy, which is really a small trough within the main trough over the east right now, is called a shortwave trough. This shortwave will have some fast winds aloft as it treks through Kentuckiana late this evening and that will along with a cold front moving through early tomorrow morning will trigger a threat of severe storms.

While scattered storms will be possible for most of today, the best timing for severe storms in Kentuckiana looks to be from 10pm to 4am. The main threats from the storms that go severe will be damaging winds and hail but any of these storms can have heavy rain and lightning. Since these storms will be hitting during the overnight period they won't have the punch that they could've had during the daytime. The tornado threat looks very low right now but as with any line of storms moving through there's a possibility that a kink in the line could form a small spin-up. A Slight Risk of severe weather has been issued for this evening through early tomorrow morning for the entirety of Kentuckiana. The good news with all of this is that much cooler air will be filtering in behind the cold front for Friday and the weekend!

7/10 - 11:55pm - A Tale of Two TV Stations

Let's start with weather first, shall we? Today was hot in Louisville, much hotter than anticipated because dry air that made its way into the area allowed temperatures to rise quite a bit. We're talking about a high temperature that was 95 degrees today, which even though is very warm, it was still cooler than what we experienced during last week's massive heat wave. Tomorrow should be a little cooler as moister air moves in again from the south.

Daily rain chances will be ramping up Thursday in Louisville as a trough develops to the west of the Mississippi River. It's already been raining in West Tennessee a bit this week, but more is on the way through the weekend as this trough gets its act together and a warm front moves northward. The rain is still needed in West Tennessee as drought conditions persist throughout the region. This rain will keep temperatures down in both regions, which is good news after all the heat! Between this past morning and Sunday morning there could be over 6 inches of rainfall  in West Tennessee and North Mississippi according to the Hydrometeorological Prediction Center (HPC). Flash flooding issues may crop up in some of the heavier thunderstorms.

Now, to the two TV stations. The first TV station in question here is WBBJ-TV in Jackson, TN where I'll be at on Saturday and Sunday night doing weather. It's been nearly three months since I've been on air in West Tennessee so I'm happy to be coming back this weekend and next weekend too for the Saturday night shows! The second TV station in question is WAVE-TV in Louisville. Today I went in to meet with Kevin Harned and the gang at the station and came out a WAVE 3 Weather intern. This has been "in the works" for awhile but today it was made official and I'm extremely excited to be sharing this news! I'll be at WAVE a couple days a week until mid-August. My duties will be mostly web-based with social media, blogs, etc, but I'll also assist with any needed TV-related tasks. I'm so thankful to be able to intern at the station I grew up with and to work with such a great team of meteorologists!

5/18 - 2:45pm CDT - Regarding Next Week's Chase

As we make our way back to Oklahoma City on our last day of this week's storm chasing tour, I'm looking over quite a bit of data for next week's severe weather potential. After a lengthy period of high pressure ridging across the Plains (A.K.A. no storms) we're finally seeing signs that a large-scale trough will begin to move onshore from the Pacific and begin to affect the Plains during the middle part of the week. A smaller trough will be coming through this weekend as well but not a lot of moisture and our inability to chase during its peak on Saturday due to our down day in Oklahoma City means it will not be discussed here.

This trough coming in next week will need some moisture to work with for severe weather to form. This is something we've had a problem with for a while now but it looks like the Gulf of Mexico will finally be "open for business" starting next week. As the trough begins creating southwesterly winds and diffluence aloft in Kansas extending into Northwest Oklahoma on Wednesday (5/23), southerly winds at the surface should begin to bring in some much-needed moisture. The degree to which this will happen is still very much up in the air at this point because the GFS model has been consistently overshooting actual dew points, meaning it's been too optimistic about moisture return. The European model does agree that moisture will begin flowing into the Plains on Wednesday, but to a lesser degree than the GFS on the right.

This setup will continue right into Thursday and Friday as the trough digs in and moisture continues to flow into the region. These two days may harbor better severe weather chances than Wednesday due to having more time for moisture to return. Given the possibility that small-scale weather phenomena like cloud shields and overnight storms could limit potential on any of these days it's very difficult to point out which of them will be the best for storm chasing. Not only that, but the aforementioned computer model issues and amount of time between now and the trough moving into the Plains creates an even bigger margin of error. It's safe to say right now that things are certainly looking more favorable synoptically (on a large scale) for severe storms, but calling for a tornado "outbreak" at this point wouldn't be logical due to the variability of all the smaller features involved. This setup certainly has our attention and we're keeping close watch! Our robotic streaming webcam has been sitting dormant since we haven't had any storms lately, but we're hoping that we can put it in action next week.

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5/17 - 4:15pm MDT - Some Fun in Denver!

Since good storms for chasing didn't form yesterday and won't form today, we're having a bit of fun in Denver, Colorado! Today we split into a few groups, one group that toured the Front Range of the Rockies, one that went to the Denver Art Museum, and another that went to the Elitch Gardens theme park in town. We all had a great time and will meet up this evening for dinner. Tomorrow we'll be heading back to Oklahoma City as Tour 2 ends and we'll be saying goodbye to our guests on Saturday morning.

For next week's tour, Tour 3, there may be a return of severe weather to the Plains. This may take until midweek though as a large-scale trough moves inland from the Pacific and moisture flows back into the region near the surface from the Gulf of Mexico. A lack of moisture in the Plains has plagued us for days now, so this return will be very welcome if what the long-range GFS model indicates pans out.

Be sure to keep up with my updates on Twitter and Facebook!
 

3/14 - 11:55pm EDT - Record-Breaking Warmth

The warm weather we've been seeing across the region hit record-breaking levels this afternoon. Here is a list of some broken temperature records today:

Jackson, TN: High 84° | Previous Record 80°

Memphis, TN: High 82° | Previous Record 80°

Chattanooga, TN: High 83° | Previous Record 81°

Louisville, KY: High 82° | Previous Record 80°

Paducah, KY: High 82° | Previous Record 78°
Evansville, IN: High 82° | Previous Record 77°

Indianapolis, IN: High 81° | Previous Record 79°

Many other cities in came close to breaking records, especially in Alabama and Middle Tennessee. The ridge over the Eastern US that's funneling all the remarkably unseasonable temperatures into the area will stay put through the weekend, but a few shortwave disturbances aloft will bring storm chances to much of West Tennessee, North Mississippi, and even into Central Kentucky tomorrow and Friday. These storms will be more organized than the spotty ones that developed in eastern portions of West Tennessee and even up through Western Kentucky this afternoon. The crazy-warm temperatures are going to last at least another full week as this strong ridge stays put, so I think to say that spring (or even summer) has sprung before winter officially ended!