Tornado Watch 332

Issued

Jun 1, 2012, 1:28 PM EDT (17:28 UTC)

Expired

Jun 1, 2012, 9:00 PM EDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Sterling radar (KLWX), 144 km from the middle of the area, began a volume at 17:31 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

50%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1003Jun 1, 12:29 PM EDT
• Mesoscale Discussion 1004Jun 1, 1:03 PM EDT
• Mesoscale Discussion 1007Jun 1, 3:35 PM EDT
• Mesoscale Discussion 1008Jun 1, 3:49 PM EDT
• Mesoscale Discussion 1014Jun 1, 6:54 PM EDT

701 
WWUS20 KWNS 011729
SEL2
SPC WW 011729
MDZ000-NCZ000-PAZ000-VAZ000-WVZ000-020100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 332
NWS STORM PREDICTION CENTER NORMAN OK
130 PM EDT FRI JUN 1 2012

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

       MARYLAND
       NORTHWEST NORTH CAROLINA
       SOUTH-CENTRAL PENNSYLVANIA
       WESTERN AND NORTHERN VIRGINIA
       EASTERN WEST VIRGINIA PANHANDLE

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 130 PM UNTIL 900
PM EDT.

TORNADOES...HAIL TO 1.5 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 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHEAST OF ALTOONA
PENNSYLVANIA TO 40 MILES WEST OF GREENSBORO NORTH CAROLINA.  FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU2).

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.

DISCUSSION...STRONG FORCED ASCENT WITH A LARGE SCALE TROUGH WAS
LIKELY CONTRIBUTING TO AN INCREASE IN LOW-TOPPED CONVECTION ALONG A
COLD FRONT NOW SITUATED FROM ERN OH SWD ACROSS WV...EXTREME SWRN VA
AND ERN TN. EXPECT THAT THIS CONVECTION WILL CROSS THE SPINE OF THE
APPALACHIANS OVER THE NEXT 2 HOURS. AS THE FRONT BEGINS TO INTERACT
WITH GREATER INSTABILITY EAST OF THE MOUNTAINS...MORE  VIGOROUS
STORM DEVELOPMENT IN THE FORM OF BOWING/LEWPING LINE SEGMENTS CAN BE
EXPECTED. A WEAK FRONTAL WAVE MAY ALSO TAKE FORM WITH TIME
COINCIDENT WITH AN INCREASE IN STORMS ALONG A WARM FRONT EXTENDING
ACROSS SRN PA AND INTO THE DELMARVA REGION. IN ADDITION TO WIND
DAMAGE AND SOME HAIL THREAT WITH THE STORMS ALONG THE ADVANCING
FRONT...AN ENHANCED BUT FOCUSED TORNADO THREAT MAY EVOLVE NEAR THE
FRONTAL WAVE AND WARM FRONT.

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
450. MEAN STORM MOTION VECTOR 22035.


...CARBIN

Tornado Watches in Virginia, 2012Tornado Watches in West Virginia, 2012Tornado Watches in Pennsylvania, 2012Every tornado watch in 2012

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.