SWOMCD
SPC MCD 312034
RIZ000-CTZ000-NYZ000-NJZ000-PAZ000-DEZ000-MDZ000-VAZ000-312200-
MESOSCALE DISCUSSION 1738
NWS STORM PREDICTION CENTER NORMAN OK
0334 PM CDT FRI JUL 31 2009
AREAS AFFECTED...MID-ATLC FROM NRN VA NEWD TO CT
CONCERNING...SEVERE THUNDERSTORM WATCH 644...
VALID 312034Z - 312200Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 644
CONTINUES.
MODEST PRESSURE FALL AXIS EXTENDS ACROSS LWR ERN MD NWD INTO CNTRL
NJ AND THE MESOSCALE LOW NEAR KPHL SHOULD TRACK ENE ALONG THE
EMERGING OUTFLOW INTO THE PRESSURE FALLS INTO CNTRL NJ THROUGH 22Z.
BOWS AND BRIEF SUPERCELL STRUCTURES AHEAD OF THIS FEATURE WILL
CONTINUE TO OFFER THE HIGHEST SVR THREATS DOWNSTREAM ACROSS DE INTO
CNTRL/SRN NJ. HERE...MLCAPES OF 2000 J/KG WILL SUPPORT VIGOROUS
UPDRAFTS AND PRESENCE OF AROUND 175 M2/S2 OF 0-1KM SRH MAY BE
SUFFICIENT FOR DISCRETE CELLS AHEAD OF THE BOWS TO PRODUCE A BRIEF
TORNADO.
ELSEWHERE...LINEAR STORMS CONTINUE TO EVOLVE ALONG NRN REACHES OF
THE OUTFLOW BOUNDARY ACROSS CNTRL/SRN NEW ENGLAND WHERE AIR MASS
HEATED INTO THE MID AND UPR 70S TODAY. SIMILAR TO THEIR
COUNTERPARTS TO THE SOUTH...STORMS IN THIS CORRIDOR MAY PRODUCE DMGG
WIND GUSTS/ISOLD TORNADO...PARTICULARLY SOUTH OF THE MASS TURNPIKE
AND SE OF A LINE FROM KBOS TO KHVN LINE.
..RACY.. 07/31/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...BOX...OKX...PHI...AKQ...LWX...
LAT...LON 38537727 39567581 40927368 41797258 41817201 41317188
40787199 40477305 40137364 39177425 38637480 38457532
38777601 38297636 38277691 38537727
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