Tornado Watch 93

Issued

Apr 4, 2011, 1:03 PM CDT (18:03 UTC)

Expired

Apr 4, 2011, 8:00 PM CDT

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), 78 km from the middle of the area, began a volume at 18:07 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

60%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

20%

One or more hailstones of 2 inches or more

10%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 343Apr 4, 10:25 AM CDT
• Mesoscale Discussion 348Apr 4, 2:52 PM CDT
• Mesoscale Discussion 353Apr 4, 6:50 PM CDT

984 
WWUS20 KWNS 041805
SEL3  
SPC WW 041805
ALZ000-TNZ000-042300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 93
NWS STORM PREDICTION CENTER NORMAN OK
105 PM CDT MON APR 4 2011

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

       WESTERN AND NORTHERN ALABAMA
       SOUTHERN MIDDLE TENNESSEE

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 105 PM UNTIL 600
PM CDT.

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 100 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHWEST OF
HUNTSVILLE ALABAMA TO 35 MILES SOUTHEAST OF TUPELO MISSISSIPPI. 
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU3).

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 89...WW 90...WW 91...WW
92...

DISCUSSION...MATURING QLCS WILL CONTINUE TO SURGE EWD ACROSS MS/TN
TOWARD WRN AND NRN AL.  ADDITIONAL ISOLATED STORM DEVELOPMENT WILL
BE POSSIBLE IN ADVANCE OF THE FRONTAL SQUALL LINE.  A COMBINATION OF
MID 60S BOUNDARY LAYER DEWPOINTS...SURFACE TEMPERATURES IN THE
70S...AND STRONG SWLY SHEAR PROFILES WILL FAVOR MAINTENANCE OF THE
QLCS WITH AN ATTENDANT RISK FOR DAMAGING WINDS.  A COUPLE OF
TORNADOES WILL ALSO BE POSSIBLE IF THE PRE-FRONTAL CONVECTION CAN
DEVELOP SUPERCELL CHARACTERISTICS PRIOR TO BEING OVERTAKEN BY THE
LINE...AND WITH EMBEDDED QLCS CIRCULATIONS.

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 26040.


...THOMPSON

Tornado 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.