Tornado Watch 7

Issued

Jan 22, 2012, 10:59 PM CST (04:59 UTC)

Expired

Jan 23, 2012, 6:00 AM CST

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Columbus AFB radar (KGWX), 96 km from the middle of the area, began a volume at 05:00 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

70%

One or more EF2 to EF5 tornadoes

40%

Ten or more severe wind reports

70%

One or more gusts of 65 knots or more

50%

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

95%

• Mesoscale Discussion 51Jan 22, 8:37 PM CST
• Mesoscale Discussion 52Jan 22, 9:47 PM CST
• Mesoscale Discussion 55Jan 23, 1:25 AM CST
• Mesoscale Discussion 56Jan 23, 4:02 AM CST

732 
WWUS20 KWNS 230503
SEL7
SPC WW 230503
ALZ000-ARZ000-LAZ000-MSZ000-TNZ000-231200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 7
NWS STORM PREDICTION CENTER NORMAN OK
1100 PM CST SUN JAN 22 2012

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

       NORTHWEST ALABAMA
       EXTREME SOUTHEAST ARKANSAS
       NORTHEAST LOUISIANA
       CENTRAL AND NORTHERN MISSISSIPPI
       WESTERN AND MIDDLE TENNESSEE

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1100 PM UNTIL
600 AM CST.

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 90 STATUTE
MILES EAST AND WEST OF A LINE FROM 15 MILES EAST NORTHEAST OF
CLARKSVILLE TENNESSEE TO 50 MILES SOUTH SOUTHWEST OF JACKSON
MISSISSIPPI.  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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 5. WATCH NUMBER 5 WILL NOT BE IN EFFECT AFTER 1100
PM CST. CONTINUE...WW 6...

DISCUSSION...PRE-FRONTAL SQUALL LINE WILL CONTINUE TO SURGE EWD
OVERNIGHT FROM NW MS/WRN TN TO MIDDLE TN AND NW AL...WHILE
ADDITIONAL STORM DEVELOPMENT WILL BE POSSIBLE ACROSS CENTRAL/NE MS
ALONG THE MOIST AXIS/CONFLUENCE BAND.  A VERY STRONG SHEAR
ENVIRONMENT REMAINS IN PLACE ACROSS THE WATCH AREA...WITH AN
ATTENDANT RISK OF BOTH SUPERCELL AND QLCS TORNADOES WHERE
SURFACE-BASED INSTABILITY EXISTS.  EVENTUALLY...THE NE EXTENT OF THE
TORNADO/WIND DAMAGE THREAT WILL BECOME LIMITED BY THE RESIDUAL
COOL/STABLE AIR MASS THAT HAS BEEN SLOW TO ERODE FROM NE AL/NW GA
INTO ERN TN.

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 24050.


...THOMPSON

Tornado Watches in Mississippi, 2012Tornado Watches in Tennessee, 2012Tornado Watches in Alabama, 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.