The atmosphere over South Mississippi and SW Alabama was becoming more unstable late tonight. The Storm Prediction thinks a slight threat of severe weather may shift a bit further inland into Central Mississippi.
The NWS, Jackson, issued a Tornado Warning until midnight for Yazoo County in Central Mississippi. A thunderstorm over that county was capable of producing a tornado. Moving NE at 40 mph.
Here is the partial text of a special discussion from the NWS, Birmingham:
SEVERE WEATHER POTENTIAL ACROSS CENTRAL ALABAMA IS INCREASING.
OVER THE PAST TWO HOURS…THE AIR HAS BEEN DESTABILIZING SOUTH
OF A TUSCALOOSA TO TROY LINE WITH INCREASING SURFACE TEMPERATURES
AND DEWPOINTS. AT 10 PM CST…MERIDIAN MISSISSIPPI REPORTED A
SURFACE TEMPERATURE OF 69 DEGREES AND DEWPOINT OF 66 DEGREES.
LOCAL MESOSCALE MODELS INDICATE THAT LIFTED INDICES HAVE FALLEN TO
-2 ACROSS SOUTHWEST ALABAMA AND SOUTHEAST MISSISSIPPI.
WITH THE APPROACH OF THE UPPER LEVEL DISTURBANCE AND OBSERVED
SURFACE PRESSURE FALLS…BELIEVE THE DESTABILIZATION WILL CONTINUE
THROUGH THE NIGHT. INSTABILITY WILL NOT BE EXCESSIVE…LIFTED
INDICES AROUND -2 AND SURFACE BASED CAPES UP TO 500 J/KG…BUT
THE AIR SHOULD BE UNSTABLE ENOUGH TO CAUSE SOME SEVERE WEATHER.
STRONG LIFT WITH THE UPPER LOW MOVING DIRECTLY OVERHEAD WILL
OVERCOME THE WEAKER INSTABILITY.
DAMAGING WINDS ARE THE MAIN HAZARD…THOUGH AN ISOLATED TORNADO
OR TWO MAY OCCUR AS WELL. LOCATIONS SOUTH OF A MILLPORT TO TROY
LINE APPEAR TO HAVE THE BEST CHANCE FOR SEVERE STORMS IN THE 2 TO
8 AM CST TIME FRAME WEST OF INTERSTATE 65…AND THE 5 TO 11 AM CST
TIME RANGE EAST OF INTERSTATE 65. WOULD NOT BE SURPRISED IF THE
LINE PUSHED FARTHER NORTH…DEPENDING ON THE STRENGTH OF MOISTURE
RETURN AND DESTABILIZATION.
We will try to update this situation soon after 2 am>
