MESO: Mesoscale Discussion 0783

ACUS11 KWNS 231938
SWOMCD
SPC MCD 231937
PAZ000-DEZ000-MDZ000-VAZ000-DCZ000-WVZ000-232030-

MESOSCALE DISCUSSION 0783
NWS STORM PREDICTION CENTER NORMAN OK
0237 PM CDT THU MAY 23 2013

AREAS AFFECTED...PORTIONS OF CENTRAL VA...MD...SRN PA...NRN DE

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 231937Z - 232030Z

PROBABILITY OF WATCH ISSUANCE...40 PERCENT

SUMMARY...SCTD SVR TSTMS WITH AT LEAST SOME THREAT FOR DAMAGING
WINDS...MARGINALLY SVR HAIL AND A BRIEF TORNADO WILL CONTINUE
THROUGH 23Z. TRENDS ARE BEING MONITORED FOR A POSSIBLE WW.

DISCUSSION...SCTD STG/SVR TSTMS HAVE DEVELOPED ALONG THE BLUE RIDGE
MTNS THIS AFTN WHERE BREAKS IN CLOUD COVER HAS ALLOWED TEMPERATURES
TO CLIMB TO NEAR 80 WITH DEW POINTS IN THE MID TO UPPER 60S. MLCAPE
VALUES AVERAGE AROUND 1000 J/KG...LOCALLY HIGHER WHERE MORE
PERSISTENT BREAKS IN THE CLOUDS EXIST. MESOANALYSIS AND AREA VWP
DATA SHOW MODEST 0-6 KM SHEAR AVERAGING 30 KTS...SUPPORTIVE OF
ORGANIZED TSTMS. PW VALUES APPROACHING 1.5 INCHES WILL SUPPORT THE
POTENTIAL FOR DAMAGING DOWNBURST WINDS WITH THE STRONGEST TSTMS. AN
ISOLD LARGE HAIL REPORT IS ALSO POSSIBLE. A BRIEF TORNADO CANNOT BE
RULED OUT IN THE LEE OF THE BLUE RIDGE OVER NRN VA WHERE SURFACE
PRESSURE FALLS WERE NOTED IN ASSOCIATION WITH A WEAK SURFACE LOW.
THE THREAT SHOULD DIMINISH AFT 23Z AS DIURNAL COOLING COMMENCES.

..BUNTING/KERR.. 05/23/2013

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...PHI...AKQ...CTP...LWX...RNK...

LAT...LON 39657821 40477767 40657689 40457591 40047559 39467575
38037661 36627785 36597860 36797934 37527955 39657821

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