MESO: Mesoscale Discussion 1273

ACUS11 KWNS 251958
SWOMCD
SPC MCD 251957
DEZ000-MDZ000-VAZ000-NCZ000-252100-

MESOSCALE DISCUSSION 1273
NWS STORM PREDICTION CENTER NORMAN OK
0257 PM CDT MON JUN 25 2012

AREAS AFFECTED...SERN MD...VA

CONCERNING...SEVERE THUNDERSTORM WATCH 426...

VALID 251957Z - 252100Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 426
CONTINUES.

SUMMARY...DAMAGING WINDS AND LARGE HAIL WILL ACCOMPANY THUNDERSTORMS
AS THEY SPREAD TOWARD COASTAL SERN VA.

DISCUSSION...SOMEWHAT VEERED LOW LEVEL FLOW HAS ALLOWED LOW LEVEL
LAPSE RATES TO STEEPEN SIGNIFICANTLY ACROSS SRN VA WHERE SFC-3KM
VALUES ARE NOW ON THE ORDER OF 9 C/KM. THIS APPEARS PARTLY
RESPONSIBLE FOR ROBUST UPDRAFTS AND SEVERE DOWNBURSTS THAT HAVE BEEN
NOTED WITH PRE-FRONTAL CONVECTION. UNTIL THIS AIR MASS STABILIZES
DUE TO FRONTAL PASSAGE OR DIURNAL COOLING THERE IS MORE THAN
ADEQUATE INSTABILITY ACROSS THIS REGION FOR SEVERE THUNDERSTORMS
CAPABLE OF PRODUCING DAMAGING WIND GUSTS AND LARGE HAIL. GREATEST
CONCENTRATION OF STORMS WILL SOON CONGREGATE OVER SERN VA.

..DARROW.. 06/25/2012

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

ATTN...WFO...PHI...AKQ...LWX...RAH...RNK...

LAT...LON 38137923 38457529 36727529 36387921 38137923

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