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Mesoscale Discussion 639 |
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MESOSCALE DISCUSSION 0639
NWS STORM PREDICTION CENTER NORMAN OK
0627 PM CDT WED APR 27 2011
AREAS AFFECTED...ERN MS
CONCERNING...TORNADO WATCH 232...
VALID 272327Z - 280000Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 232 CONTINUES.
A NEW TORNADO WATCH WILL BE COORDINATED SOON FOR PARTS OF EAST
CENTRAL AND SERN MS TO REPLACE WW 232 SCHEDULED TO EXPIRE AT 00Z.
LATEST SURFACE ANALYSIS SHOWED A DRY LINE EXTENDING FROM NERN TO
SWRN MS. THIS BOUNDARY IS ADVANCING EWD AT 30 KT...WITH THE SRN
EXTENT S OF JAN NOT FORECAST TO MOVE INTO SWRN AL UNTIL AFTER 03Z.
WARM SECTOR AIR MASS REMAINS MODERATELY UNSTABLE WITH EFFECTIVE BULK
SHEAR EXCEEDING 50 KT. THIS ENVIRONMENT WILL CONTINUE TO SUPPORT
SUPERCELLS WITH EFFECTIVE SRH 200-400 M2/S2 RESULTING IN AN EXTENDED
TORNADO THREAT THROUGH THE EVENING.
..PETERS.. 04/27/2011
ATTN...WFO...MOB...MEG...JAN...LIX...
LAT...LON 31379094 33158924 34368818 31968850 30908929 30989022
31379094
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