WATCHES: Severe Thunderstorm Watch Number 355

WWUS20 KWNS 241643
SEL5
SPC WW 241643
MDZ000-NCZ000-VAZ000-CWZ000-250000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 355
NWS STORM PREDICTION CENTER NORMAN OK
1240 PM EDT TUE MAY 24 2011

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

SOUTHEAST MARYLAND
NORTHERN NORTH CAROLINA
CENTRAL AND EASTERN VIRGINIA
COASTAL WATERS

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1240 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 100
STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES WEST
NORTHWEST OF PATUXENT RIVER MARYLAND TO 30 MILES SOUTHEAST OF
ROCKY MOUNT NORTH CAROLINA. FOR A COMPLETE DEPICTION OF THE
WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).

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 352...WW 353...WW 354...

DISCUSSION...NOCTURNAL MCS CURRENTLY EMERGING FROM THE BLUE RIDGE
HAS SHOWN A RAPID INCREASE IN STORM COVERAGE AND INTENSITY ALONG
ERN/SRN PERIPHERY OF SYSTEM COLD POOL. AMBIENT INFLOW AIR MASS HAS
WARMED INTO THE 80S. WHEN COUPLED WITH BOUNDARY LAYER DEWPOINTS IN
THE 60S...ENVIRONMENT HAS BECOME MODERATELY UNSTABLE WITH MLCAPE
VALUES OF 1000-2000 J/KG. GIVEN 40-50 KT WLY FLOW OBSERVED IN THE
700-500 MB LAYER /PER REGIONAL VAD DATA/...SETUP WILL FAVOR
ORGANIZED STORM MODES INCLUDING LINE SEGMENTS AND SUPERCELLS CAPABLE
OF DAMAGING WINDS AND HAIL.

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 28035.

...MEAD

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