Tornado Watch 830

Issued

Sep 3, 2011, 9:43 PM CDT (02:43 UTC)

Expired

Sep 4, 2011, 7:00 AM CDT

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

0.5 in

Strongest gust expected

60 kt

Two or more tornadoes

40%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

5%

One or more gusts of 65 knots or more

5%

Ten or more severe hail reports

5%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

20%

• Mesoscale Discussion 2112Sep 3, 5:57 PM CDT
• Mesoscale Discussion 2114Sep 3, 11:35 PM CDT
• Mesoscale Discussion 2116Sep 4, 4:30 AM CDT

861 
WWUS20 KWNS 040244
SEL0
SPC WW 040244
ALZ000-FLZ000-LAZ000-MSZ000-CWZ000-041200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 830
NWS STORM PREDICTION CENTER NORMAN OK
945 PM CDT SAT SEP 3 2011

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

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

EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 945 PM
UNTIL 700 AM CDT.

TORNADOES...HAIL TO 0.5 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 70 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTHWEST OF BATON
ROUGE LOUISIANA TO 35 MILES EAST OF PENSACOLA FLORIDA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU0).

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 828. WATCH NUMBER 828 WILL NOT BE IN EFFECT AFTER
945 PM CDT. CONTINUE...WW 829...

DISCUSSION...TS LEE IS LOCATED NEAR THE S CENTRAL LA COAST AND IS
EXPECTED TO MOVE LITTLE THE NEXT SEVERAL HOURS.  DISCRETE CELLS WILL
CONTINUE TO FORM ON THE NOSE OF THE MIDLEVEL DRY SLOT ACROSS THE LA
DELTA EWD TO THE AL COAST...WHERE LOW-LEVEL MOISTURE/BUOYANCY/SHEAR
ARE STRONGEST.  THE TORNADO RISK WILL PERSIST WITH STORMS CROSSING
THE COAST THROUGH THE OVERNIGHT HOURS.  THE TORNADO RISK IS A LITTLE
LESS FARTHER INLAND ACROSS SRN MS...AND CLOSER TO THE CENTER IN S
CENTRAL LA...BUT LOW-TOPPED SUPERCELL DEVELOPMENT CANNOT BE RULED
OUT IN THESE AREAS A LITTLE LATER TONIGHT.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 18030.


...THOMPSON

Tornado Watches in Louisiana, 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.