WATCHES: Tornado Watch Number 257

WWUS20 KWNS 070031
SEL7
SPC WW 070031
MDZ000-NCZ000-VAZ000-CWZ000-070800-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 257
NWS STORM PREDICTION CENTER NORMAN OK
820 PM EDT WED MAY 6 2009

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

SOUTHERN MARYLAND
CENTRAL AND EASTERN NORTH CAROLINA
CENTRAL AND EASTERN VIRGINIA
COASTAL WATERS

EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 820 PM
UNTIL 400 AM EDT.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 60 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE
MILES EITHER SIDE OF A LINE FROM 50 MILES SOUTH SOUTHWEST OF
GREENSBORO NORTH CAROLINA TO 10 MILES NORTH OF WALLOPS VIRGINIA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU7).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 256. WATCH NUMBER 256 WILL NOT BE IN EFFECT AFTER
820 PM EDT.

DISCUSSION...ISOLD TO WIDELY SCTD TSTMS MAY CONTINUE TO FORM THROUGH
LATER THIS EVENING INVOF SHALLOW WARM FRONT OVER S CNTRL VA...AND
FARTHER S IN SLIGHTLY CONFLUENT WARM SECTOR ACROSS PIEDMONT NC.
ALTHOUGH LARGE SCALE FORCING FOR ASCENT WILL REMAIN MODEST PER
SATELLITE AND EVE VWP DATA/...AND LOSS OF SFC HEATING WILL KEEP
ADDITIONAL STORM DEVELOPMENT ISOLD TO WIDELY SCTD...PRESENCE OF
MODERATE TO STRONG DEEP DIRECTIONAL SHEAR...AND ENHANCED LOW LVL
SHEAR NEAR WARM FRONT ..SUGGEST POTENTIAL FOR ISOLD TORNADOES WITH
ANY LONGER-LIVED UPDRAFTS AS TEMPERATURE-DEW POINT SPREADS DECREASE.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 50 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.
MEAN STORM MOTION VECTOR 23035.

...CORFIDI

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