MESO: Mesoscale Discussion 0668

ACUS11 KWNS 290027
SWOMCD
SPC MCD 290027
MDZ000-VAZ000-NCZ000-290100-

MESOSCALE DISCUSSION 0668
NWS STORM PREDICTION CENTER NORMAN OK
0727 PM CDT THU APR 28 2011

AREAS AFFECTED...SERN VA...SRN DELMARVA PENINSULA...AND ERN NC

CONCERNING...TORNADO WATCH 255...

VALID 290027Z - 290100Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 255 CONTINUES.

SEVERE WEATHER THREAT WILL CONTINUE TO AFFECT THE ERN PARTS OF WW
255 BEYOND THE EXPIRATION TIME OF 01Z. LIMITED SPATIAL AND TEMPORAL
THREAT SHOULD PRECLUDE THE NEED FOR A NEW WATCH. HOWEVER...LOCAL
WFO EXTENSION OF THIS WATCH IS POSSIBLE DUE TO A CONTINUED SEVERE
WEATHER THREAT THROUGH 02-03Z.

THE AIR MASS ACROSS WW 255 REMAINS SUPPORTIVE FOR SEVERE STORMS
/MODERATE INSTABILITY AND EFFECTIVE BULK SHEAR 45-60 KT/...
INCLUDING A TORNADO THREAT PER EFFECTIVE SRH OF 200-300 M2/S2.
EARLY EVENING RADAR TRENDS SUGGEST STORMS WILL CONTINUE TO AFFECT
FAR ERN NC INCLUDING THE OUTER BANKS THROUGH 02Z. FARTHER
N...WEAKER LOW LEVEL SHEAR SUGGESTS A GREATER THREAT FOR ISOLATED
DAMAGING WINDS AND HAIL WITH STORMS TRACKING NEWD FROM SERN VA
TOWARD THE SRN CHESAPEAKE BAY TO SRN DELMARVA THROUGH 02-03Z.

..PETERS.. 04/29/2011

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

ATTN...WFO...AKQ...MHX...LWX...

LAT...LON 34387624 34607714 35417660 36267653 36657684 37047729
37787678 38427648 38387468 36827558 35377508 34907531
34387624

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