MESOSCALE DISCUSSION 2290
NWS STORM PREDICTION CENTER NORMAN OK
0403 PM CDT WED AUG 27 2003
AREAS AFFECTED...MID/UPPER OH VLY INTO THE NRN/CNTRL WV
MTNS...SCNTRL PA...NRN VA...WRN/CNTRL MD AND THE DISTRICT OF
COLUMBIA
CONCERNING...SEVERE THUNDERSTORM WATCH 901...902...
VALID 272103Z - 272230Z
LARGE COMPLEX OF TSTMS CONTINUES TO TRANSLATE ACROSS THE CNTRL
APPALACHIANS LATE THIS AFTERNOON AND WILL BE MOVING INTO THE MIDDLE
ATLANTIC REGION EARLY THIS EVENING.
INDIVIDUAL CELLS WITHIN THIS MCS HAVE SHOWN A TENDENCY TO BOW...
ESPECIALLY FROM WRN MD INTO NRN WV THE LAST HOUR OR SO. THE TSTMS
HAVE BEEN MOVING INTO AN AREA WHERE MIDLEVEL FLOW IS STRONGER THAN
FARTHER WEST...ON THE ORDER OF 35-40 KTS. THUS...THE WIND DAMAGE
POTENTIAL COULD BE INCREASING DOWNSTREAM INTO THE ERN PNHDL OF
WV...NRN VA AND THE DISTRICT OF COLUMBIA FOR THE NEXT FEW HOURS.
THE STRONGEST TSTMS WITH THE HIGHEST PROBABILITY FOR WIND DAMAGE
WILL TRACK ALONG/SOUTH OF AN OLD OUTFLOW BOUNDARY EXTENDING FROM
KW99(MOOREFIELD WV)-KOKV-KDCA.
OTHERWISE...TO THE WEST...TSTMS HAVE BACKBUILT ON THE NRN AND SRN
EDGES OF THE MCS ACROSS SWRN PA AND ENTERING THE KANAWHA VLY OF WV.
THESE TSTMS MAY PRODUCE HAIL AND DAMAGING WINDS AS WELL...ESPECIALLY
ACROSS CNTRL WV WHERE INSTABILITY IS STRONGER.
..RACY.. 08/27/2003
ATTN...WFO...PHI...AKQ...CTP...LWX...PBZ...RLX...
38318243 38878117 39468055 40298087 40317915 39577594
37637653 38307986
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