Tornado Watch 146

Issued

Apr 15, 2011, 7:48 PM CDT (00:48 UTC)

Expired

Apr 16, 2011, 2:09 AM CDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

Two or more tornadoes

80%

One or more EF2 to EF5 tornadoes

50%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 443Apr 15, 6:09 PM CDT
• Mesoscale Discussion 444Apr 15, 7:16 PM CDT
• Mesoscale Discussion 445Apr 15, 7:51 PM CDT
• Mesoscale Discussion 448Apr 15, 10:41 PM CDT
• Mesoscale Discussion 449Apr 16, 1:43 AM CDT

464 
WWUS20 KWNS 160049
SEL6
SPC WW 160049
ALZ000-FLZ000-MSZ000-CWZ000-160800-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 146
NWS STORM PREDICTION CENTER NORMAN OK
745 PM CDT FRI APR 15 2011

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

       CENTRAL AND SOUTHERN ALABAMA
       THE WESTERN FLORIDA PANHANDLE
       EXTREME SOUTHEAST MISSISSIPPI
       COASTAL WATERS

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 745 PM
UNTIL 300 AM CDT.

TORNADOES...HAIL TO 2 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 30 MILES NORTHWEST OF LA
GRANGE GEORGIA TO 20 MILES EAST OF MOBILE ALABAMA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU6).

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 141. WATCH NUMBER 141 WILL NOT BE IN EFFECT AFTER
745 PM CDT. CONTINUE...WW 142...WW 143...WW 144...WW 145...

DISCUSSION...CLUSTERS OF SUPERCELLS IN CENTRAL/SRN AL AND SE MS WILL
CONTINUE TO SPREAD EWD THROUGH THE OVERNIGHT HOURS IN ADVANCE OF THE
MS VALLEY MIDLEVEL TROUGH AND SURFACE BOUNDARY.  WEAK-MODERATE
INSTABILITY AND STRONG VERTICAL SHEAR WILL BE MAINTAINED OVER THIS
AREA...AND THE TORNADO/SEVERE THREAT WILL EXPAND EWD TONIGHT AS THE
LOW LEVELS MOISTEN FARTHER E INTO SE AL AND THE FL PANHANDLE.  A
STRONG TORNADO OR TWO WILL REMAIN POSSIBLE FOR THE NEXT SEVERAL
HOURS...GIVEN THE PRESENCE OF DISCRETE SUPERCELLS IN A MOIST
ENVIRONMENT WITH EFFECTIVE SRH NEAR 500 M2/S2.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 27030.


...THOMPSON

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