

447 

WWUS20 KWNS 201728

SEL2

SPC WW 201728

NCZ000-VAZ000-WVZ000-210000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 502

NWS STORM PREDICTION CENTER NORMAN OK

130 PM EDT TUE JUL 20 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN NORTH CAROLINA

       CENTRAL AND WESTERN VIRGINIA

       SOUTHEAST WEST VIRGINIA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 130 PM UNTIL

800 PM EDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTH

SOUTHWEST OF BLUEFIELD WEST VIRGINIA TO 45 MILES SOUTHEAST OF

CHARLOTTESVILLE VIRGINIA.  FOR A COMPLETE DEPICTION OF THE WATCH

SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



DISCUSSION...A CLUSTER OF SHOWERS AND THUNDERSTORMS MOVING ACROSS

THE CENTRAL APPALACHIANS WILL LIKELY INTENSIFY AND SPREAD EASTWARD

ACROSS THE WATCH AREA THIS AFTERNOON.  HOT AND MOIST SURFACE

CONDITIONS ARE YIELDING MODERATE CAPE VALUES AND STEEP LOW LEVEL

LAPSE RATES.  STRONGER STORMS WILL BE CAPABLE OF DAMAGING WIND

GUSTS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 27025.





...HART

