

128 

WWUS20 KWNS 161730

SEL1

SPC WW 161730

INZ000-KYZ000-MDZ000-OHZ000-PAZ000-WVZ000-170000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 71

NWS STORM PREDICTION CENTER NORMAN OK

130 PM EDT FRI APR 16 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SMALL PART OF SOUTHEASTERN AND EAST-CENTRAL INDIANA

       SMALL PART OF NORTH-CENTRAL AND NORTHEASTERN KENTUCKY

       WESTERNMOST PART OF MARYLAND PANHANDLE

       MUCH OF OHIO

       MOST OF CENTRAL AND WESTERN PENNSYLVANIA

       NORTHERN WEST VIRGINIA



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 130 PM UNTIL 800

PM EDT.



HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

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

NORTHWEST OF CINCINNATI OHIO TO 15 MILES SOUTH OF WILLIAMSPORT

PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...INCREASING COVERAGE AND INTENSITY OF TSTMS ARE FCST

THROUGH AFTERNOON AS INFLOW-LAYER AIR MAS CONTINUES TO DESTABILIZE

AHEAD OF SFC COLD FRONT. PRIMARY SVR THREAT IS DAMAGING WIND FROM

MULTICELLULAR CLUSTERS/SEGMENTS...PER MESOSCALE DISCUSSION 318.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION

VECTOR 23040.





...EDWARDS/THOMPSON

