Post by Nws Olney Maryland on May 23, 2011 10:21:50 GMT -5
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 338
NWS STORM PREDICTION CENTER OLNEY MD
1050 AM EDT MON MAY 23 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
DISTRICT OF COLUMBIA
MARYLAND
CENTRAL PENNSYLVANIA
NORTHERN VIRGINIA
EASTERN WEST VIRGINIA PANHANDLE
COASTAL WATERS
EFFECTIVE THIS MONDAY MORNING AND EVENING FROM 1050 AM UNTIL 600
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 70
STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES EAST
NORTHEAST OF STATE COLLEGE PENNSYLVANIA TO 25 MILES EAST OF
CHARLOTTESVILLE VIRGINIA. 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 337...
DISCUSSION...TSTMS CURRENTLY DEVELOPING AHEAD OF MCV FROM WRN PA TO
ERN VA SHOULD CONTINUE TO INCREASE IN COVERAGE AND INTENSITY THIS
AFTERNOON AS ACTIVITY ENCOUNTERS A DESTABILIZING AIR MASS E OF THE
BLUE RIDGE. THE COMBINATION OF MLCAPE INCREASING TO 1000-2000 J/KG
AND STRONG WLY MID-TROPOSPHERIC FLOW /REF. 12Z ILN SOUNDING/ WILL
PROMOTE UPSCALE GROWTH OF STORMS INTO AN MCS CAPABLE OF LARGE HAIL
AND DAMAGING WIND GUSTS.
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 27035.
SEVERE THUNDERSTORM WATCH NUMBER 338
NWS STORM PREDICTION CENTER OLNEY MD
1050 AM EDT MON MAY 23 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
DISTRICT OF COLUMBIA
MARYLAND
CENTRAL PENNSYLVANIA
NORTHERN VIRGINIA
EASTERN WEST VIRGINIA PANHANDLE
COASTAL WATERS
EFFECTIVE THIS MONDAY MORNING AND EVENING FROM 1050 AM UNTIL 600
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 70
STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES EAST
NORTHEAST OF STATE COLLEGE PENNSYLVANIA TO 25 MILES EAST OF
CHARLOTTESVILLE VIRGINIA. 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 337...
DISCUSSION...TSTMS CURRENTLY DEVELOPING AHEAD OF MCV FROM WRN PA TO
ERN VA SHOULD CONTINUE TO INCREASE IN COVERAGE AND INTENSITY THIS
AFTERNOON AS ACTIVITY ENCOUNTERS A DESTABILIZING AIR MASS E OF THE
BLUE RIDGE. THE COMBINATION OF MLCAPE INCREASING TO 1000-2000 J/KG
AND STRONG WLY MID-TROPOSPHERIC FLOW /REF. 12Z ILN SOUNDING/ WILL
PROMOTE UPSCALE GROWTH OF STORMS INTO AN MCS CAPABLE OF LARGE HAIL
AND DAMAGING WIND GUSTS.
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 27035.