WATCHES: Severe Thunderstorm Watch Number 418

WWUS20 KWNS 221816
SEL8
SPC WW 221816
DCZ000-DEZ000-MDZ000-NJZ000-VAZ000-CWZ000-230100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 418
NWS STORM PREDICTION CENTER NORMAN OK
215 PM EDT FRI JUN 22 2012

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

DISTRICT OF COLUMBIA
DELAWARE
MARYLAND EXCEPT PANHANDLE
SOUTHERN NEW JERSEY
CENTRAL AND EASTERN VIRGINIA
COASTAL WATERS

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 215 PM UNTIL 900
PM EDT.

HAIL TO 1.5 INCHES 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 95
STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES SOUTH
SOUTHWEST OF SOUTH HILL VIRGINIA TO 5 MILES NORTHWEST OF
WILMINGTON DELAWARE. FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

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...

DISCUSSION...TSTMS FCST TO CONTINUE INCREASING IN COVERAGE/INTENSITY
THROUGH REMAINDER AFTERNOON AHEAD OF SFC COLD FRONT...AMIDST
1000-2500 J/KG MLCAPE AND 20-30 KT EFFECTIVE SHEAR MAGNITUDES. THIS
WILL SUPPORT PRIMARILY MULTICELLULAR CONVECTIVE MODES AND THREAT FOR
DAMAGING DOWNDRAFTS. ISOLATED LARGE HAIL ALSO IS POSSIBLE.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 27025.


...EDWARDS

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