SEL4
SPC WW 272021
NYZ000-OHZ000-PAZ000-LEZ000-280400-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 424
NWS STORM PREDICTION CENTER NORMAN OK
420 PM EDT SUN JUN 27 2010
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN NEW YORK
EAST-CENTRAL AND NORTHEASTERN OHIO
NORTHWESTERN PENNSYLVANIA
LAKE ERIE
EFFECTIVE THIS SUNDAY AFTERNOON FROM 420 PM UNTIL MIDNIGHT 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 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES SOUTHWEST
OF MANSFIELD OHIO TO 55 MILES EAST SOUTHEAST OF BUFFALO NEW YORK.
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.
OTHER WATCH INFORMATION...CONTINUE...WW 423...
DISCUSSION...SVR THREAT FCST TO SHIFT/EXPAND EWD FROM WW 423 AND
FROM SRN ONT REGION ACROSS FAVORABLY UNSTABLE AIR MASS...UNDER SRN
RIM OF FAVORABLE WLYS ALOFT AND RELATED DEEP-LAYER SHEAR...DURING
REMAINDER AFTERNOON INTO EVENING. REF SPC MESOSCALE DISCUSSION 1147
FOR INITIAL FCST DETAILS.
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 27030.
...EDWARDS/THOMPSON
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