LATE URGENT NOTE…
From Alan Gerard, Chief at the NWS Jackson…MSU (Miss. St.) chase team reports 3/4 mile wide tornado over NE Kemper county MS moving east. Estimated inflow winds of 80 mph.
We need everyone in Central Alabama to understand this is an increasingly dangerous situation for Central Alabama.
A powerful thunderstorm with strong signs of rotation is approaching northern Sumter County. This is the long lived supercell that produced all the damage in the Jackson MS area.
A tornado warning continues for Greene and Sumter Counties until 2:30 p.m.
The airmass over Alabama is becoming gradually more and more unstable. The severe weather threat is going to continue to ramp up through the rest of the afternoon and evening especially for areas south of the big rain area across Lamar, Marion, Fayette, Walker, Winston, Cullman and Marshall Counties.
This note from the SPC underscores that…
ACUS11 KWNS 151831
SWOMCD
SPC MCD 151830
GAZ000-ALZ000-FLZ000-MSZ000-LAZ000-152030-
MESOSCALE DISCUSSION 0438
NWS STORM PREDICTION CENTER NORMAN OK
0130 PM CDT FRI APR 15 2011
AREAS AFFECTED…PORTIONS MS…CENTRAL-ERN LA…AL…EXTREME WRN GA.
CONCERNING…TORNADO WATCH 140…141…
VALID 151830Z – 152030Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 140…141…CONTINUES.
CONTINUE W 141. REPLACEMENT WW FOR 140 IS LIKELY BEFORE SCHEDULED
20Z EXPIRATION…BECAUSE SVR THREAT WILL PERSIST WELL BEYOND THAT
TIME AND PRIOR TO COLD FROPA.
18Z SFC MESOANALYSIS SHOWED COLD FRONT CONTINUING TO MOVE EWD ACROSS
NERN…CENTRAL AND SWRN LA…WITH WARM FRONT ANALYZED ROUGHLY 30 NNE
TCL…TCL…GZH…NSE AND LIFTING NEWD ACROSS W-CENTRAL/S-CENTRAL
AL. PRE COLD-FRONTAL CONFLUENCE LINE IS PIVOTING EWD ACROSS
SWRN/CENTRAL MS WHILE DRIFTING EWD ACROSS SERN LA. AS THESE
PROCESSES CONTINUES…FAVORABLY BUOYANT AND STRONGLY HEATED AIR
MASS…CHARACTERIZED BY MLCAPE 1000-2000 J/KG…WILL OVERSPREAD
PROGRESSIVELY MORE OF CENTRAL/SRN AND EVENTUALLY ERN AL…THROUGH
LATE AFTERNOON. NRN FRINGE OF STRONGEST HEATING IS EVIDENT IN SFC
DATA AND VIS IMAGERY ROUGHLY ALONG JAN-EET LINE…AND HAS MOVED N OF
MEI. STORMS WITHIN AND JUST N OF THAT BOUNDARY MAY ENCOUNTER
ENHANCED LOW-LEVEL VORTICITY/ASCENT. THIS INCLUDES LONG-LIVED
SUPERCELL NOW MOVING TOWARD PORTIONS SUMTER/GREENE/HALE/TUSCALOOSA
COUNTIES AL THAT PRODUCED DAMAGING TORNADO IN JAN AREA AROUND
16Z…AND MORE RECENTLY…REPORT OF LARGE TORNADO IN KEMPER COUNTY
AT 1820Z. UPSHEAR SUPERCELLS S AND SW JAN ALSO MAY INTERACT WITH
THAT BOUNDARY. CELLS OVER SERN MS AND SRN AL MAY ENCOUNTER WARM
FRONT…WHERE LOW-LEVEL BACKING/VORTICITY/HODOGRAPHS WILL BE
RELATIVELY MAXIMIZED. BOTH REGIMES MAY SUPPORT CORRIDORS OF LOCALLY
ENHANCED TORNADO POTENTIAL…WITH EFFECTIVE SRH REACHING 500 J/KG.
HOWEVER…STG LOW-MIDLEVEL SPEED SHEAR WILL SUPPORT SUPERCELL THREAT
EVEN AS FAR W AS S-CENTRAL LA.
SVR POTENTIAL MAY EXTEND INTO PORTIONS WRN GA DURING NEXT 2-3 HOURS
WITH CELLS WELL NE OF SFC WARM FRONT…BUT IN REGIME OF ELEVATED WAA
AND STRENGTHENING BUOYANCY/SHEAR ALOFT…SUPPORTING OCNL HAIL.
BETTER-ORGANIZED THREAT THERE IS NOT EXPECTED UNTIL LATE AFTERNOON
INTO EVENING.
..EDWARDS.. 04/15/2011
LAMAR COUNTY FLOODING
Flooding is being reported in the city of Vernon in Lamar County.
