SWOMCD
SPC MCD 291620
NJZ000-PAZ000-DEZ000-MDZ000-VAZ000-DCZ000-WVZ000-291715-
MESOSCALE DISCUSSION 0889
NWS STORM PREDICTION CENTER NORMAN OK
1120 AM CDT FRI MAY 29 2009
AREAS AFFECTED...SERN PA...SRN NJ...MD...DE...NRN VA
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 291620Z - 291715Z
...SEVERE THREAT IS INCREASING ACROSS THE DELMARVA...
STRONG BOUNDARY LAYER HEATING CONTINUES EAST OF THE APPALACHIANS
EARLY THIS AFTERNOON WHERE SFC-3KM LAPSE RATES ARE NOW APPROACHING
7.5 C/KM ACROSS VA INTO SRN MD. SFC PARCELS HAVE APPARENTLY REACHED
THEIR CONVECTIVE TEMPERATURES WITH THUNDERSTORMS NOW DEVELOPING
ALONG WIND SHIFT WITH RELATIVE EASE FROM SCNTRL PA INTO NRN VA.
THIS TREND SHOULD CONTINUE WITH A MARKED INCREASE IN CONVECTION
EXPECTED ACROSS THE DELMARVA OVER THE NEXT FEW HOURS. WITH MODEST
SWLY FLOW THROUGH MID LEVELS...ESEWD MOVING STORMS WILL GRADUALLY
ORGANIZE AS THEY SPREAD TOWARD THE NJ/DE/MD/VA COAST. LARGE HAIL
AND GUSTY WINDS ARE POSSIBLE.
..DARROW.. 05/29/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PHI...AKQ...CTP...LWX...
LAT...LON 38997885 40247787 40547557 39537456 37887632 37897856
38997885
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