Tornado Watch 280

Issued

Jun 11, 2014, 2:59 PM EDT (18:59 UTC)

Expired

Jun 11, 2014, 9:00 PM EDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Pittsburgh radar (KPBZ), 109 km from the middle of the area, began a volume at 19:02 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

30%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

10%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 953Jun 11, 12:25 PM EDT
• Mesoscale Discussion 954Jun 11, 1:32 PM EDT
• Mesoscale Discussion 964Jun 11, 8:07 PM EDT

525 
WWUS20 KWNS 111859
SEL0  
SPC WW 111859
DCZ000-MDZ000-PAZ000-VAZ000-WVZ000-CWZ000-120100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 280
NWS STORM PREDICTION CENTER NORMAN OK
300 PM EDT WED JUN 11 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  DISTRICT OF COLUMBIA
  WESTERN AND CENTRAL MARYLAND
  SOUTHWEST AND SOUTH-CENTRAL PENNSYLVANIA
  NORTHERN VIRGINIA
  NORTHERN AND EASTERN WEST VIRGINIA
  COASTAL WATERS

* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 300 PM
  UNTIL 900 PM EDT.

* PRIMARY THREATS INCLUDE...
  A COUPLE TORNADOES POSSIBLE
  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTHWEST OF
PITTSBURGH PENNSYLVANIA TO 50 MILES SOUTHEAST OF HAGERSTOWN
MARYLAND.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 279...

DISCUSSION...THUNDERSTORMS DEVELOPING OVER PARTS OF VA AND WV ARE
EXPECTED TO MOVE NORTH AND INTERACT WITH A QUASI-STATIONARY BOUNDARY
WHERE SHEAR AND VORTICITY ARE ENHANCED. IN ADDITION TO A LARGE HAIL
AND DAMAGING WIND THREAT...A COUPLE OF TORNADOES ARE POSSIBLE.

AVIATION...TORNADOES AND 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 23025.


...MEAD

Tornado Watches in Pennsylvania, 2014Tornado Watches in Virginia, 2014Tornado Watches in West Virginia, 2014Every tornado watch in 2014

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.