Post by Nws Olney Maryland on Sept 22, 2010 14:09:45 GMT -5
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 682
NWS STORM PREDICTION CENTER NORMAN OK/OLNEY MD
245 PM EDT WED SEP 22 2010
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
DISTRICT OF COLUMBIA
MARYLAND
NORTHERN VIRGINIA
EASTERN WEST VIRGINIA PANHANDLE
COASTAL WATERS
EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 245 PM UNTIL
1000 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 55
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH
NORTHWEST OF BALTIMORE MARYLAND TO 20 MILES EAST SOUTHEAST OF
CHARLOTTESVILLE VIRGINIA. FOR A COMPLETE DEPICTION OF THE WATCH
SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).
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 680...WW 681...
DISCUSSION...TSTMS ARE EXPECTED TO INTENSIFY ALONG LEE TROUGH AND
MOVE INTO THE REGION FROM THE W/NW AS AIR MASS CONTINUES TO
WARM/DESTABILIZE. WHILE AREA RESIDES ALONG SRN FRINGE OF
STRONGER...ZONAL MID AND HIGH-LEVEL WIND FIELD...SUFFICIENT VERTICAL
SHEAR WILL EXIST TO SUPPORT ORGANIZED STORMS INCLUDING MULTICELLS
AND BOWING LINE SEGMENTS WITH A RISK FOR 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 27025.
SEVERE THUNDERSTORM WATCH NUMBER 682
NWS STORM PREDICTION CENTER NORMAN OK/OLNEY MD
245 PM EDT WED SEP 22 2010
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
DISTRICT OF COLUMBIA
MARYLAND
NORTHERN VIRGINIA
EASTERN WEST VIRGINIA PANHANDLE
COASTAL WATERS
EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 245 PM UNTIL
1000 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 55
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH
NORTHWEST OF BALTIMORE MARYLAND TO 20 MILES EAST SOUTHEAST OF
CHARLOTTESVILLE VIRGINIA. FOR A COMPLETE DEPICTION OF THE WATCH
SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).
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 680...WW 681...
DISCUSSION...TSTMS ARE EXPECTED TO INTENSIFY ALONG LEE TROUGH AND
MOVE INTO THE REGION FROM THE W/NW AS AIR MASS CONTINUES TO
WARM/DESTABILIZE. WHILE AREA RESIDES ALONG SRN FRINGE OF
STRONGER...ZONAL MID AND HIGH-LEVEL WIND FIELD...SUFFICIENT VERTICAL
SHEAR WILL EXIST TO SUPPORT ORGANIZED STORMS INCLUDING MULTICELLS
AND BOWING LINE SEGMENTS WITH A RISK FOR 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 27025.