Tornado Watch 31

Issued

Feb 28, 2011, 5:59 AM CST (11:59 UTC)

Expired

Feb 28, 2011, 12:42 PM CST

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

The Nashville radar (KOHX), 142 km from the middle of the area, began a volume at 12:01 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

60%

One or more EF2 to EF5 tornadoes

40%

Ten or more severe wind reports

60%

One or more gusts of 65 knots or more

40%

Ten or more severe hail reports

10%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 170Feb 28, 5:28 AM CST
• Mesoscale Discussion 171Feb 28, 5:47 AM CST
• Mesoscale Discussion 173Feb 28, 11:25 AM CST

256 
WWUS20 KWNS 281201
SEL1
SPC WW 281201
ALZ000-ARZ000-MSZ000-TNZ000-VAZ000-281900-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 31
NWS STORM PREDICTION CENTER NORMAN OK
700 AM EST MON FEB 28 2011

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

       NORTHERN ALABAMA
       FAR EASTERN ARKANSAS
       NORTHERN MISSISSIPPI
       MIDDLE AND EASTERN TENNESSEE
       FAR WESTERN VIRGINIA

EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 700 AM UNTIL 200
PM EST.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 115 STATUTE
MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH NORTHWEST OF
CROSSVILLE TENNESSEE TO 15 MILES SOUTHEAST OF GREENWOOD
MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

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 28...WW 29...WW 30...

DISCUSSION...COMPLEX STORM EVOLUTION IS ONGOING IN ADVANCE OF POTENT
MIDLEVEL TROUGH AND ASSOCIATED 80-100 KT MIDLEVEL JET STREAK MOVING
THROUGH THE OZARK PLATEAU.  AMBIENT AIR MASS IS WARM AND RATHER
MOIST WITH MLCAPE VALUES OF 500-1000 J/KG AND LITTLE OR NO
CONVECTIVE INHIBITION.  AREA VWPS CONTINUE TO SHOW VERY STRONG LOW
AND DEEP-LAYER SHEAR IN PLACE ACROSS REGION WITH 0-1 KM SRH VALUES
OF 300-500 M2/S2.  AS SUCH...THE POTENTIAL WILL EXIST FOR EMBEDDED
SUPERCELL AND/OR BOWING STRUCTURES WITH A RISK FOR TORNADOES
/POSSIBLY STRONG/ AND DAMAGING WINDS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 25040.


...MEAD

Tornado Watches in Tennessee, 2011Tornado Watches in Mississippi, 2011Tornado Watches in Alabama, 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.