Tornado Watch 838

Issued

Sep 5, 2011, 5:35 AM CDT (10:35 UTC)

Expired

Sep 5, 2011, 4:00 PM CDT

In force

10 hr

Issued by

the Storm Prediction Center

Largest hail expected

0.5 in

Strongest gust expected

65 kt

The Birmingham radar (KBMX), 131 km from the middle of the area, began a volume at 10:39 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

95%

One or more EF2 to EF5 tornadoes

40%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

30%

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

70%

• Mesoscale Discussion 2129Sep 5, 4:26 AM CDT
• Mesoscale Discussion 2130Sep 5, 7:24 AM CDT
• Mesoscale Discussion 2131Sep 5, 11:01 AM CDT
• Mesoscale Discussion 2134Sep 5, 3:15 PM CDT

532 
WWUS20 KWNS 051048
SEL8
SPC WW 051048
ALZ000-FLZ000-GAZ000-MSZ000-CWZ000-052100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 838
NWS STORM PREDICTION CENTER NORMAN OK
540 AM CDT MON SEP 5 2011

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

       MUCH OF ALABAMA
       THE FLORIDA PANHANDLE
       SOUTHWEST GEORGIA
       EASTERN MISSISSIPPI
       COASTAL WATERS

EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 540 AM UNTIL 400
PM CDT.

TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 130 STATUTE
MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH OF TUSCALOOSA
ALABAMA TO 40 MILES SOUTHWEST OF PANAMA CITY 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 837. WATCH NUMBER 837 WILL NOT BE IN EFFECT AFTER
540 AM CDT.

DISCUSSION...BANDS AND SMALL CLUSTERS OF SHOWERS/TSTMS WITH THE
POTENTIAL FOR TORNADOES EXPECTED TO PERSIST THROUGH THIS AFTN OVER
PARTS OF THE SERN STATES...IN ERN QUADRANT OF HYBRID T.D. LEE.
SATELLITE AND SFC OBS SUGGEST THAT LEE WILL CONTINUE TO UNDERGO
EXTRATROPICAL TRANSITION.  THIS SHOULD RESULT IN STRENGTHENING AND
PERHAPS BROADENING OF SSWLY LLJ EXTENDING FROM THE NERN GULF OF
MEXICO INTO AL AND THE WRN FL PANHANDLE BY MIDDAY...WITH SPEEDS AOA
50 KTS.  AT THE SAME TIME...A BELT OF STRENGTHENING 700-500 MB FLOW
WILL OVERSPREAD REGION AS UPR CIRCULATION OF LEE ELONGATES ENEWD.
COUPLED WITH SFC HEATING AND LOW LVL UPLIFT ALONG NWD MOVING CSTL
BOUNDARY...SETUP MAY YIELD INCREASING NUMBERS OF SUPERCELLS RELATIVE
TO THE PAST TWO DAYS...ESPECIALLY OVER SRN/CNTRL AL AND PERHAPS THE
WRN FL PANHANDLE/SW GA.  OTHER STORMS /INCLUDING TRAINING CELLS AND
LEWPS/ CAPABLE OF ISOLD TORNADOES AND DMGG WIND MAY EVOLVE ALONG
DEVELOPING STNRY FRONT EXTENDING ENE FROM THE CENTER OF LEE INTO NRN
AL/NW GA.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 19040.


...CORFIDI

Tornado Watches in Alabama, 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; radar from the NEXRAD Level II archive.