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MESOSCALE DISCUSSION 0775
NWS STORM PREDICTION CENTER NORMAN OK
1151 PM CDT FRI MAY 08 2009
AREAS AFFECTED...VA/NORTHERN NC
CONCERNING...TORNADO WATCH 276...
VALID 090451Z - 090615Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 276 CONTINUES.
TORNADO WATCH 276 CONTINUES UNTIL 07Z ACROSS PORTIONS OF WESTERN
VA/NORTHWEST NC. MONITORING FOR AN ADDITIONAL WATCH FARTHER EAST
ACROSS VA/NORTHERN NC.
MID LEVEL MCV ASSOCIATED WITH EARLY DAY/UPSTREAM BOW ECHO CONTINUES
TO QUICKLY PROGRESS EASTWARD ACROSS THE CENTRAL APPALACHIANS STRONG
40-50 KT WESTERLY MID LEVEL FLOW. ACROSS THE EASTERN PORTION OF
TORNADO WATCH 276...SURFACE COLD POOL AND PRESSURE
PERTURBATION/COUPLET APPEARS TO HAVE SUFFICIENTLY SURVIVED CROSSING
THE VA MOUNTAINS...WITH AN UPSWING IN TSTM INTENSITY NOTED FROM
SOUTHWEST INTO SOUTH CENTRAL VA OVER THE PAST HOUR. GIVEN THE PARENT
MCV AND STRONG/LARGELY UNIDIRECTIONAL VERTICAL SHEAR AND RELATIVELY
MOIST/UNSTABLE DOWNSTREAM AIRMASS ACROSS VA/NORTHERN NC...AN
ADDITIONAL WATCH MAY BE NEEDED.
..GUYER.. 05/09/2009
ATTN...WFO...AKQ...MHX...RAH...RNK...
LAT...LON 37167969 37317831 37717727 37417638 36727638 35887724
35927839 36438017 37167969
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