WATCHES: Severe Thunderstorm Watch Number 71

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

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