Cancellation
Severe Thunderstorm Watch
Statement as of 8:38 PM EDT on July 18, 2012
The National Weather Service has cancelled Severe Thunderstorm
Watch 491 for the following areas
In Virginia this cancels 11 counties
In central Virginia
Albemarle Greene Nelson
In northwest Virginia
Madison Page Rappahannock
Shenandoah Warren
In western Virginia
Augusta Highland Rockingham
In West Virginia this cancels 3 counties
In northeast West Virginia
Grant Hardy Pendleton
In Virginia this cancels 4 independent cities
In central Virginia
Charlottesville
In northwest Virginia
City of Harrisonburg
In western Virginia
City of Staunton City of Waynesboro
SEVERE THUNDERSTORM WATCH NUMBER 491
URGENT – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 491
NWS STORM PREDICTION CENTER NORMAN OK
1245 PM EDT WED JUL 18 2012
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
DISTRICT OF COLUMBIA
DELAWARE
MARYLAND
NEW JERSEY
SOUTHEAST NEW YORK
CENTRAL AND EASTERN PENNSYLVANIA
NORTHERN VIRGINIA
EASTERN WEST VIRGINIA PANHANDLE
COASTAL WATERS
EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1245 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 80
STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES EAST OF
STAUNTON VIRGINIA TO 25 MILES EAST NORTHEAST OF WILKESBARRE
PENNSYLVANIA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).
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 490…
DISCUSSION…TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY THIS AFTERNOON AHEAD OF COLD FRONT AND LEE TROUGH.
AMBIENT WARM SECTOR IS HOT AND HUMID WITH MLCAPE VALUES OF
2000-3000+ J/KG. WHEN COUPLED WITH STEEPENING LOW-LEVEL LAPSE RATES
AND HIGH PW VALUES…SETUP WILL FAVOR THE DEVELOPMENT OF INTENSE WET
MICROBURSTS CAPABLE OF DAMAGING WINDS.
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 31020.
County City Outline Area
SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 491
NWS STORM PREDICTION CENTER NORMAN OK
1245 PM EDT WED JUL 18 2012
SEVERE THUNDERSTORM WATCH 491 IS IN EFFECT UNTIL 900 PM EDT
FOR THE FOLLOWING LOCATIONS
VAC003-013-015-043-047-059-061-069-079-091-099-107-113-125-137-
139-153-157-165-171-177-179-187-510-540-600-610-630-660-683-685-
790-820-840-190100-
/O.NEW.KWNS.SV.A.0491.120718T1645Z-120719T0100Z/
VA
. VIRGINIA COUNTIES INCLUDED ARE
ALBEMARLE ARLINGTON AUGUSTA
CLARKE CULPEPER FAIRFAX
FAUQUIER FREDERICK GREENE
HIGHLAND KING GEORGE LOUDOUN
MADISON NELSON ORANGE
PAGE PRINCE WILLIAM RAPPAHANNOCK
ROCKINGHAM SHENANDOAH SPOTSYLVANIA
STAFFORD WARREN
VIRGINIA INDEPENDENT CITIES INCLUDED ARE
ALEXANDRIA CHARLOTTESVILLE FAIRFAX
FALLS CHURCH FREDERICKSBURG HARRISONBURG
MANASSAS MANASSAS PARK STAUNTON
WAYNESBORO WINCHESTER
$$
