WATCHES: Severe Thunderstorm Watch Number 254

WWUS20 KWNS 041720
SEL4
SPC WW 041720
INZ000-OHZ000-PAZ000-WVZ000-LEZ000-050000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 254
NWS STORM PREDICTION CENTER NORMAN OK
115 PM EDT FRI JUN 4 2010

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

CENTRAL INDIANA
MUCH OF OHIO
WESTERN PENNSYLVANIA
NORTHERN PANHANDLE OF WEST VIRGINIA
LAKE ERIE

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 115 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 55
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES WEST
SOUTHWEST OF TERRE HAUTE INDIANA TO 10 MILES EAST OF FRANKLIN
PENNSYLVANIA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).

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...STORMS ARE DEVELOPING ALONG CONVERGENT BOUNDARY THAT
EXTENDED FROM CENTRAL INDIANA NEWD INTO WESTERN PENNSYLVANIA. STORMS
SHOULD INCREASE IN NUMBER AND INTENSITY THROUGH THE AFTERNOON AS AN
UPPER LEVEL SHORTWAVE TROUGH PASSES THROUGH THE REGION. STRONG
INSTABILITY AND 30-40 KT MID LEVEL WINDS WILL SUPPORT ORGANIZED
MULTICELL STORMS WITH HAIL AND WIND DAMAGE. THE DEEP WLY FLOW ABOVE
THE BOUNDARY LAYER MAY AID STORMS ORGANIZING INTO LINE SEGMENTS
...AND IF THIS HAPPENS...THE THREAT FOR WIND DAMAGE WOULD BE
ENHANCED.

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.

...IMY

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