Tornado Watch 129

Issued

Apr 11, 2011, 12:47 PM EDT (16:47 UTC)

Expired

Apr 11, 2011, 7:00 PM EDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Jackson,KY radar (KJKL), 49 km from the middle of the area, began a volume at 16:47 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

10%

Ten or more severe wind reports

70%

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

20%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 409Apr 11, 9:58 AM EDT
• Mesoscale Discussion 411Apr 11, 11:41 AM EDT
• Mesoscale Discussion 412Apr 11, 12:24 PM EDT
• Mesoscale Discussion 413Apr 11, 1:37 PM EDT
• Mesoscale Discussion 414Apr 11, 3:44 PM EDT

846 
WWUS20 KWNS 111647
SEL9
SPC WW 111647
KYZ000-MDZ000-OHZ000-VAZ000-WVZ000-112300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 129
NWS STORM PREDICTION CENTER NORMAN OK
1250 PM EDT MON APR 11 2011

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

       MUCH OF EASTERN KENTUCKY
       PARTS OF MARYLAND PANHANDLE
       PARTS OF SOUTHEAST OHIO
       PARTS OF WESTERN VIRGINIA
       MUCH OF WEST VIRGINIA

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL
700 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 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 35 MILES SOUTH SOUTHWEST OF
LONDON KENTUCKY TO 5 MILES NORTH NORTHWEST OF MORGANTOWN WEST
VIRGINIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 128...

DISCUSSION...STRONG HEATING HAS DESTABILIZED AIR MASS ACROSS WATCH
AREA AHEAD OF COLD FRONT.  WITH 50-60KT OF SHEAR AND MUCAPES AOA
1000 J/KG...THUNDERSTORMS WILL INCREASE IN NUMBER/INTENSITY EASTWARD
ACROSS THE WATCH AREA.  PRIMARY THREAT WILL BE DAMAGING
WINDS...HOWEVER TORNADOES WILL BE POSSIBLE ASSOCIATED WITH ANY
SUPERCELL ABLE TO FORM.

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 24035.


...HALES

Tornado Watches in West Virginia, 2011Tornado Watches in Kentucky, 2011Tornado Watches in Virginia, 2011Every tornado watch in 2011

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.