Tornado Watch 447

Issued

Jun 4, 2008, 12:49 PM EDT (16:49 UTC)

Expired

Jun 4, 2008, 7:42 PM EDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Sterling radar (KLWX), 67 km from the middle of the area, began a volume at 16:50 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Two or more tornadoes

40%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

80%

One or more gusts of 65 knots or more

40%

Ten or more severe hail reports

70%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1199Jun 4, 11:51 AM EDT
• Mesoscale Discussion 1202Jun 4, 2:01 PM EDT
• Mesoscale Discussion 1205Jun 4, 4:04 PM EDT
• Mesoscale Discussion 1210Jun 4, 7:13 PM EDT

000
WWUS20 KWNS 041651
SEL7  
SPC WW 041651
DCZ000-MDZ000-PAZ000-VAZ000-WVZ000-CWZ000-050000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 447
NWS STORM PREDICTION CENTER NORMAN OK
1250 PM EDT WED JUN 4 2008

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

       DISTRICT OF COLUMBIA
       WESTERN AND CENTRAL MARYLAND
       SOUTH CENTRAL PENNSYLVANIA
       NORTHERN AND CENTRAL VIRGINIA
       EASTERN WEST VIRGINIA INCLUDING THE PANHANDLE
       COASTAL WATERS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL
800 PM EDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 95 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 55 MILES NORTHWEST OF
STAUNTON VIRGINIA TO 30 MILES NORTH NORTHEAST OF PATUXENT RIVER
MARYLAND.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

OTHER WATCH INFORMATION...CONTINUE...WW 446...

DISCUSSION...BAND OF INTENSE THUNDERSTORMS OVER WV WILL TRACK
EASTWARD AND AFFECT PARTS OF SOUTHERN PA...WESTERN AND CENTRAL
MD...AND NORTHERN VA THIS AFTERNOON.  OTHER ISOLATED STORMS ARE
LIKELY TO FORM IN MOIST/UNSTABLE AIRMASS OVER CENTRAL VA.  STRONG
WESTERLY WINDS ALOFT AND DEGREE OF INSTABILITY INDICATE A RISK OF
SUPERCELL STORMS CAPABLE OF DAMAGING WINDS...LARGE HAIL..AND
ISOLATED TORNADOES.  BOW ECHO FORMATION IS ALSO A POSSIBILITY WITH
AN ASSOCIATED ENHANCED RISK OF DAMAGING WINDS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 27035.


...HART

Tornado Watches in Virginia, 2008Tornado Watches in Maryland, 2008Tornado Watches in West Virginia, 2008Every tornado watch in 2008

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.