

756 

WWUS20 KWNS 170008

SEL0

SPC WW 170008

OHZ000-WVZ000-170300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 670

NWS STORM PREDICTION CENTER NORMAN OK

810 PM EDT THU SEP 16 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EXTREME SOUTHEAST OHIO

       NORTHERN WEST VIRGINIA



EFFECTIVE THIS THURSDAY EVENING FROM 810 PM UNTIL 1100 PM EDT.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE

MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH NORTHWEST OF

ELKINS WEST VIRGINIA TO 65 MILES WEST SOUTHWEST OF ELKINS WEST

VIRGINIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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...CONTINUE...WW 669...



DISCUSSION...ONGOING SUPERCELLS ALONG THE OH RIVER WILL PERSIST FOR

ANOTHER 1-3 HOURS WHILE MOVING INTO WV.  INSTABILITY WEAKENS WITH

EWD EXTENT ACROSS WV...BUT SHOULD REMAIN SUFFICIENT TO SUPPORT A

CONTINUED RISK OF SUPERCELLS/TORNADOES GIVEN THE RELATIVELY STRONG

VERTICAL SHEAR.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.

MEAN STORM MOTION VECTOR 30030.





...THOMPSON

