SWOMCD
SPC MCD 271933
DEZ000-MDZ000-VAZ000-NCZ000-272130-
MESOSCALE DISCUSSION 0606
NWS STORM PREDICTION CENTER NORMAN OK
0233 PM CDT FRI APR 27 2007
AREAS AFFECTED...ERN NC...SERN VA...VA CAPE
CONCERNING...SEVERE THUNDERSTORM WATCH 197...
VALID 271933Z - 272130Z
THE SEVERE WEATHER THREAT FOR VALID PORTIONS OF SEVERE THUNDERSTORM
WATCH 197 CONTINUES.
MID/UPR-LEVEL SPEED MAX MOVING THROUGH THE MID-ATLANTIC REGION HAS
SUPPORTED SCATTERED STRONG TSTMS ACROSS ERN NC INTO SERN VA THIS
AFTN. IN WAKE OF THIS IMPULSE...RUC SOUNDINGS SUGGEST THAT
SUBSIDENCE/MID-LVL WARMING WAS SPREADING NEWD AND HAS...OR
WILL...BECOME SOMEWHAT UNSUPPORTIVE FOR SUSTAINED SEVERE TSTMS BY
EARLY EVE. UNTIL THEN...TSTM CLUSTERS/SHORT-LINE SEGMENTS WILL
LIKELY FAVOR NERN NC INTO SERN VA FOR A FEW MORE HOURS. DAMAGING
WINDS AND PERHAPS HAIL WILL ACCOMPANY THE STRONGER STORMS. AN
UPSTREAM IMPULSE ROUNDING THE BASE OF THE GRTLKS TROUGH WILL SWING
NEWD INTO THE SERN STATES/CAROLINAS LATER THIS EVE. BY
THEN...HOWEVER...THE INCREASING DOWNSLOPE LOW-LVL FLOW SHOULD OFFSET
THE LARGER SCALE ASCENT AND MINIMIZE THE SVR RISKS DURING THE
EVENING HOURS.
.RACY.. 04/27/2007
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PHI...AKQ...MHX...LWX...RAH...RNK...
38857647 38787540 38417472 37157554 36897570 36187589
35647573 34957647 34817725 35057869 35857925
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