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Mesoscale Discussion 1345 |
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MESOSCALE DISCUSSION 1345
NWS STORM PREDICTION CENTER NORMAN OK
0503 PM CDT TUE JUN 21 2011
AREAS AFFECTED...FAR NERN AL...SERN TN...NRN GA...SWRN NC
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 212203Z - 212300Z
UPSCALE GROWTH INTO A QLCS HAS OCCURRED THROUGH PORTIONS OF NERN
AL...WHICH SHOULD RESULT IN A CONTINUATION OF SCATTERED DAMAGING
WIND REPORTS INTO PORTIONS OF THE SRN APPALACHIANS. A SEVERE TSTM
WATCH ISSUANCE IS POSSIBLE ACROSS THE REGION.
SQUALL LINE EXTENDED FROM LINCOLN COUNTY TN TO CHEROKEE COUNTY AL OF
2155Z. ALTHOUGH UPPER-LEVEL SUPPORT APPEARS NEBULOUS...A BELT OF
30-35 KT UNIDIRECTIONAL LOW/MID-LEVEL SWLYS WERE NOTED BEHIND THIS
LINE IN THE HUNTSVILLE/BIRMINGHAM VWP DATA. WITH DOWNSTREAM SURFACE
TEMPERATURE/DEW POINT SPREADS AROUND 25-30 DEG F...INDICATIVE OF A
STEEP LOW-LEVEL LAPSE RATE PROFILE...A CORRIDOR OF RELATIVELY
GREATER DAMAGING WIND THREAT SHOULD EXTEND NE OF THE CURRENT SQUALL
LINE THROUGH EARLY EVENING.
..GRAMS.. 06/21/2011
ATTN...WFO...GSP...MRX...FFC...OHX...BMX...HUN...
LAT...LON 34328572 35058628 35458596 35778546 36058453 36068370
35718308 35228323 34578369 34218424 33948521 33918563
34328572
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