

418 

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

