Thunderstorms formed over Mississippi in unstable air generated when sun broke out over a warm, moist airmass at late morning.
They quickly became severe.
The airmass over Alabama is still unstable ahead of the line.
The activity will be moving through the Birmingham area between 5 and 6 o’clock.
Note the deepening low near Memphis…
The helcitiy or spin will be off the charts near the low. The good news is that our current line of storms over West Alabama will work the atmosphere over sufficiently so that instability will be limited as the main cold front arirves later tonight. It is approaching the Mississippi River now.
So that means that the primary threat appears that it will be associated with the current activity, although there will likely be additional storms near the front. They will likely be hail producers with gusty winds.
The best chance for tornadoes corresponds to this SIGTOR chart.
