WATCHES: Severe Thunderstorm Watch Number 490

WWUS20 KWNS 101750
SEL0
SPC WW 101750
VAZ000-CWZ000-110000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 490
NWS STORM PREDICTION CENTER NORMAN OK
150 PM EDT SAT AUG 10 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTH CENTRAL AND SOUTHEAST VIRGINIA
COASTAL WATERS

* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 150 PM UNTIL
800 PM EDT.

* PRIMARY THREATS INCLUDE...
SEVERAL DAMAGING WIND GUSTS TO 70 MPH LIKELY
A FEW LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 40
STATUTE MILES EITHER SIDE OF A LINE FROM 60 MILES WEST SOUTHWEST
OF RICHMOND VIRGINIA TO 40 MILES EAST NORTHEAST OF NORFOLK
VIRGINIA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

DISCUSSION...STRONG/SEVERE STORM APPROACHING RICHMOND HAS TAKEN ON A
BOW ECHO SHAPE SUGGESTING INCREASING POTENTIAL TO PRODUCE DAMAGING
WINDS. ADDITIONAL STORMS ARE EXPECTED TO DEVELOP OVER SOUTH CENTRAL
AND SERN VA WITHIN A VERY MOIST AND UNSTABLE ENVIRONMENT /MLCAPE
AROUND 2500 J PER KG. AREA VAD WIND PROFILE DATA INDICATE 30-40 KT
WESTERLY FLOW ABOVE 3-4 KM WHICH WILL PROVIDE SUFFICIENT SHEAR FOR
ORGANIZED MULTICELL STORMS AND OCCASIONAL BOW ECHOES. DAMAGING WIND
IS EXPECTED TO BE THE PRIMARY THREAT INTO THE 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 27025.


...WEISS

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