Tornado Watch 828

Issued

Sep 3, 2011, 9:41 AM CDT (14:41 UTC)

Expired

Sep 3, 2011, 10:00 PM CDT

In force

12 hr

Issued by

the Storm Prediction Center

Largest hail expected

0.5 in

Strongest gust expected

60 kt

Two or more tornadoes

70%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

30%

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

70%

• Mesoscale Discussion 2105Sep 3, 7:46 AM CDT
• Mesoscale Discussion 2109Sep 3, 1:41 PM CDT
• Mesoscale Discussion 2112Sep 3, 5:57 PM CDT

970 
WWUS20 KWNS 031444
SEL8
SPC WW 031444
ALZ000-FLZ000-LAZ000-MSZ000-CWZ000-040300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 828
NWS STORM PREDICTION CENTER NORMAN OK
940 AM CDT SAT SEP 3 2011

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

       EXTREME SOUTHERN ALABAMA
       EXTREME WESTERN FLORIDA PANHANDLE
       SOUTHEASTERN LOUISIANA
       FAR SOUTHERN MISSISSIPPI
       COASTAL WATERS

EFFECTIVE THIS SATURDAY MORNING AND EVENING FROM 940 AM UNTIL
1000 PM 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 WOU8).

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 826. WATCH NUMBER 826 WILL NOT BE IN EFFECT AFTER
940 AM CDT. CONTINUE...WW 827...

DISCUSSION...TS LEE WILL CONTINUE A VERY SLOW NWD MOVEMENT THROUGH
THIS EVE TOWARD THE SCNTRL LA COAST.  ENVELOPE OF MARITIME TROPICAL
ENVIRONMENT WILL SUBSEQUENTLY BE TRANSPORTED SLOWLY NWD AS FAR N AS
SRN MS/AL BY LATE THIS AFTN.  AT THE SAME TIME...SATL SHOWS SOME
MID-LVL DRY AIR BEING WRAPPED INTO LEE FROM THE WSW...ALLOWING
BREAKS IN THE OVERCAST AND INSOLATION BETWEEN SPIRAL BANDS.  THIS
WILL TEND TO BOOST BUOYANCY AND INCREASE THE THREAT FOR STRONG
UPDRAFTS.  SLOWLY INCREASING LLVL HELICITY WITHIN NE QUADRANT OF THE
TS WILL BOOST THE RISKS FOR A FEW TORNADO THROUGH AT LEAST THIS EVE.

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 14030.


...RACY

Tornado Watches in Louisiana, 2011Tornado Watches in Mississippi, 2011Tornado Watches in Florida, 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.