Saturday, July 25, 2009

WATCHES: Severe Thunderstorm Watch Number 624

WWUS20 KWNS 251952
SEL4
SPC WW 251952
NYZ000-PAZ000-LEZ000-LOZ000-260100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 624
NWS STORM PREDICTION CENTER NORMAN OK
350 PM EDT SAT JUL 25 2009

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

WESTERN NEW YORK
CENTRAL PENNSYLVANIA
LAKE ERIE
LAKE ONTARIO

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 350 PM UNTIL
900 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 EAST AND WEST OF A LINE FROM 20 MILES NORTH
NORTHWEST OF ROCHESTER NEW YORK TO 50 MILES SOUTHWEST OF
HARRISBURG 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.

OTHER WATCH INFORMATION...CONTINUE...WW 623...

DISCUSSION...STRONG FORCING ASSOCIATED WITH GREAT LAKES UPPER LOW
WILL PROGRESS EWD THROUGH WRN NY/CENTRAL PA THROUGH THE AFTERNOON
AND AID IN THUNDERSTORM DEVELOPMENT/INTENSIFICATION. THE LOW AND
DEEP LAYER SHEAR IS FAVORABLE FOR SOME MID LEVEL ROTATION...WITH
LARGE HAIL AND DAMAGING WINDS THE MAIN THREAT.

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 450. MEAN STORM
MOTION VECTOR 24025.


...IMY

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