http://beta.abc3340.com/weather/video.hrb
Thanks to the second graders over at Briarwood Christian... I sure enjoyed the visit today!
SPC has upgraded south Alabama to a moderate risk tomorrow, while the rest of the state remains under a slight risk of severe thunderstorms.
Looks like the main batch of storms will roll in here sometime in the 3:00 to 9:00 p.m. time frame, with the primary threat coming from damaging straight line winds and hail.
Instability values are fairly high on the WRF (SBCAPE 1500 or so over west Alabama), but moderate on the NAM (closer to 500). We do note both the WRF and the NAM show high 0 to 3 km helicity values (350 or higher) around 6:00 p.m. tomorrow.
I am still underimpressed with the wind fields; the 850 mb winds (about 5000 feet) are only expected to be in the 25 to 35 kt range, while the 250 mb winds (jet stream level) are all under 100 knots. If the winds at all levels are higher than the models suggest, the severe weather threat will be higher.
New 12Z model data still suggests some pretty decent rain totals tomorrow and tomorrow night; the NAM shows 1.27" while the GFS has 1.32" (pretty good agreement
We will maintain the chance of scattered showers and storms on Thursday as the cold pocket aloft passes over north Alabama; there could be a few showers or storms with hail. Gradual clearing is likely by late Friday, and the weekend ahead looks rain-free.
Here is a note from the Birmingham NWS office on their thinking on tomorrow's event:
"Wanted to give everyone a heads up. This event is looking like the past several events. Isolated stuff ahead of the line in the morning after daybreak. The line arriving in W. AL around late morning / noonish...which will allow for excellent peak heating for central and eastern AL. South end of the line may stall out and start to train tomorrow evening. Potential flash flooding is a major concern again...especially the I-85 corridor. Going with the standard verbage...Large hail, straight line winds, and isolated tornadoes. Main area of concern for SVR wx is ROUGHLY the 20/59 corridor and southward."
We pretty much agree with that as well.
NEXT WEEK: The GFS continue to flip-flop on next week's system; the 12z run now shows a threat of heavy rain and severe storms on Tuesday of next week. Low confidence on this now... lets get through tomorrow and then we will focus on that!
Also wanted to thank the Jackson, MS NWS office for their coodination this afternoon!