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Mesoscale Discussion 640 |
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MESOSCALE DISCUSSION 0640
NWS STORM PREDICTION CENTER NORMAN OK
0639 PM CDT WED APR 27 2011
AREAS AFFECTED...MUCH OF AL/NORTHWEST GA
CONCERNING...TORNADO WATCH 235...
VALID 272339Z - 280045Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 235 CONTINUES.
PARTICULARLY DANGEROUS SITUATION /PDS/ TORNADO WATCH 235 CONTINUES
UNTIL 03Z.
A HIGH-END TORNADO OUTBREAK WILL CONTINUE INTO THIS EVENING ACROSS A
LARGE PART OF CENTRAL/NORTHEAST AL AND NORTHWEST GA. THIS IS AN
EXTREMELY DANGEROUS AND LIFE-THREATENING SITUATION! CITIES AND AREAS
AT GREATEST RISK INCLUDE BIRMINGHAM...THE I-59 CORRIDOR OF
WESTERN/NORTHEAST AL...I-65 ACROSS NORTHERN/CENTRAL AL...AND I-20.
23Z SURFACE ANALYSIS CONTINUES TO REFLECT A HIGHLY FAVORABLE
ENVIRONMENT FOR TORNADIC SUPERCELLS...WITH RELATIVELY STRONG
SOUTHERLY LOW LEVEL WINDS COINCIDENT WITH NEAR 70F SURFACE DEWPOINTS
ESPECIALLY WITHIN AN AXIS FROM EAST-CENTRAL MS INTO WEST-CENTRAL TO
NORTHEAST AL/NORTHWEST GA. IN PROXIMITY TO DESTRUCTIVE TORNADIC
SUPERCELL NEAR/NORTH OF BIRMINGHAM...WSR-88D VWP DATA NOW REFLECTS
0-1 KM SRH IN EXCESS OF 600 M2/S2. A SEMI-DISCRETE/SUSTAINED
SUPERCELLULAR MODE...COINCIDENT WITH THE GREATEST INGREDIENTS FOR
STRONG/VIOLENT TORNADOES...IS EXPECTED TO REMAIN ACROSS WEST-CENTRAL
TO NORTHEAST/EAST-CENTRAL AL AND NORTHWEST GA THROUGH EARLY EVENING.
A CORRIDOR OF ROUGHLY 50 MILES EITHER SIDE OF I-59...AS WELL AS THE
GENERAL VICINITY OF I-20...REMAINS OF PARTICULARLY HIGH CONCERN FOR
LONG-LIVED/DESTRUCTIVE TORNADIC SUPERCELLS.
ANOTHER RELATIVELY CONCENTRATED AREA OF HIGH SHORT-TERM CONCERN WILL
REMAIN ACROSS FAR NORTHERN AL IN VICINITY OF A RECOVERING OUTFLOW
BOUNDARY...WHILE STORMS ALONG THE EASTWARD-ADVANCING PRE-FRONTAL
TROUGH/DRYLINE OTHERWISE INCREASE AND GROW UPSCALE/MERGE WITH
LEADING SEMI-DISCRETE STORMS. THIS MORE LINEAR EVOLUTION WILL LIKELY
TEMPER THE HIGH-END TORNADO POTENTIAL WITH TIME ACROSS NORTHERN
AL...BUT THE RISK FOR DAMAGING WINDS/ISOLATED TORNADOES WILL
NONETHELESS PERSIST THIS EVENING.
..GUYER.. 04/27/2011
ATTN...WFO...FFC...BMX...HUN...MOB...
LAT...LON 31558832 33758809 34798689 34548438 31988674 31558832
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