

146 

WWUS20 KWNS 112256

SEL0

SPC WW 112256

MDZ000-NCZ000-OHZ000-PAZ000-VAZ000-WVZ000-120300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 20

NWS STORM PREDICTION CENTER NORMAN OK

555 PM EST WED FEB 11 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN MARYLAND PANHANDLE

       NORTHWEST NORTH CAROLINA

       NORTHEAST OHIO

       WESTERN PENNSYLVANIA

       WESTERN VIRGINIA

       EASTERN WEST VIRGINIA



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 555 PM UNTIL

1000 PM EST.



HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES EAST AND WEST OF A LINE FROM 75 MILES SOUTH

SOUTHWEST OF DUBLIN VIRGINIA TO 30 MILES NORTH OF DUBOIS

PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 16...WW 17...WW 18...WW

19...



DISCUSSION...NARROW LINE OF FORCED MOIST CONVECTION/THUNDERSTORMS

WILL CONTINUE RACING ENEWD ACROSS WW ALONG AND JUST NORTH OF 115 KT

H5 JET MAX.  IMPRESSIVE PRESSURE FALLS AND INTENSE/DEEP ASCENT

SHOULD SUSTAIN LINE AND ASSOCIATED WIND DAMAGE THREAT THIS

EVENING...DESPITE LACK OF VERY LIMITED INSTABILITY.  WIND DAMAGE MAY

BE WIDESPREAD WITH MORE PRONOUNCED BOWING SEGMENTS WITHIN THIS LINE.

 IN ADDITION...EXTREME SHEAR MAY SUPPORT AN ISOLATED/BRIEF-LIVED

TORNADO ALONG LEADING EDGE OF THE LINE.



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

TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 350. MEAN STORM

MOTION VECTOR 26050.





...EVANS



057 

WWUS20 KWNS 112256

SEL0

SPC WW 112256

MDZ000-NCZ000-OHZ000-PAZ000-VAZ000-WVZ000-120300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 20...RESENT

NWS STORM PREDICTION CENTER NORMAN OK

555 PM EST WED FEB 11 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN MARYLAND PANHANDLE

       NORTHWEST NORTH CAROLINA

       NORTHEAST OHIO

       WESTERN PENNSYLVANIA

       WESTERN VIRGINIA

       EASTERN WEST VIRGINIA



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 555 PM UNTIL

1000 PM EST.



HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES EAST AND WEST OF A LINE FROM 75 MILES SOUTH

SOUTHWEST OF DUBLIN VIRGINIA TO 30 MILES NORTH OF DUBOIS

PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 16...WW 17...WW 18...WW

19...



DISCUSSION...NARROW LINE OF FORCED MOIST CONVECTION/THUNDERSTORMS

WILL CONTINUE RACING ENEWD ACROSS WW ALONG AND JUST NORTH OF 115 KT

H5 JET MAX.  IMPRESSIVE PRESSURE FALLS AND INTENSE/DEEP ASCENT

SHOULD SUSTAIN LINE AND ASSOCIATED WIND DAMAGE THREAT THIS

EVENING...DESPITE LACK OF VERY LIMITED INSTABILITY.  WIND DAMAGE MAY

BE WIDESPREAD WITH MORE PRONOUNCED BOWING SEGMENTS WITHIN THIS LINE.

 IN ADDITION...EXTREME SHEAR MAY SUPPORT AN ISOLATED/BRIEF-LIVED

TORNADO ALONG LEADING EDGE OF THE LINE.



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

TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 350. MEAN STORM

MOTION VECTOR 26050.





...EVANS

