WATCHES: Severe Thunderstorm Watch Number 420

WWUS20 KWNS 191902
SEL0
SPC WW 191902
DCZ000-MDZ000-NYZ000-OHZ000-PAZ000-VAZ000-WVZ000-CWZ000-200300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 420
NWS STORM PREDICTION CENTER NORMAN OK
305 PM EDT TUE JUN 19 2007

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

DISTRICT OF COLUMBIA
NORTHERN MARYLAND
PARTS OF SOUTHEAST NEW YORK
PARTS OF SOUTHEAST OHIO
MUCH OF SOUTHERN PENNSYLVANIA
PARTS OF NORTHERN VIRGINIA
PARTS OF CENTRAL AND EASTERN WEST VIRGINIA
COASTAL WATERS

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 305 PM UNTIL
1100 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 95
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTHEAST
OF ALLENTOWN PENNSYLVANIA TO 10 MILES NORTH OF CHARLESTON WEST
VIRGINIA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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 417...WW 418...WW 419...

DISCUSSION...THUNDERSTORMS WILL INCREASER IN NUMBER AND INTENSITY
ACROSS THE WATCH AREA REMAINDER OF THE AFTERNOON AS STRONG HEATING
CONTINUES IN A MDTLY UNSTABLE AIR MASS. WITH APPROACH OF TROUGH AND
COLD FRONT FROM THE WEST..STORMS WILL DEVELOP INTO SHORT
LINES/CLUSTERS INCREASING WIND DAMAGE POTENTIAL LATE THIS
AFTERNOON/EVENING.

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 550. MEAN STORM
MOTION VECTOR 25020.

..HALES

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