Tornado Watch 4

Issued

Jan 21, 2010, 2:09 AM CST (08:09 UTC)

Expired

Jan 21, 2010, 9:00 AM CST

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

Two or more tornadoes

30%

One or more EF2 to EF5 tornadoes

30%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

20%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 30Jan 20, 10:18 PM CST
• Mesoscale Discussion 34Jan 21, 1:31 AM CST
• Mesoscale Discussion 37Jan 21, 5:44 AM CST
• Mesoscale Discussion 38Jan 21, 7:12 AM CST
• Mesoscale Discussion 39Jan 21, 7:57 AM CST

448 
WWUS20 KWNS 210815
SEL4
SPC WW 210815
ALZ000-FLZ000-MSZ000-CWZ000-211500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 4
NWS STORM PREDICTION CENTER NORMAN OK
310 AM CDT THU JAN 21 2010

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

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

EFFECTIVE THIS THURSDAY MORNING FROM 310 AM UNTIL 1000 AM CDT.

TORNADOES...HAIL TO 1 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 80 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 90 MILES WEST SOUTHWEST OF
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU4).

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 3...

DISCUSSION...NNE/SSW QLCS IN CNTRL MS EXPECTED TO CONTINUE
ENEWD...WHILE ADDITIONAL STORMS/CLUSTERS CONTINUE TO FORM NEAR
SHALLOW WARM FRONT NOW EXTENDING FROM S CNTRL MS TO THE WRN FL
PANHANDLE.  DEEP WIND FIELD ACROSS REGION...ALREADY SUPPORTIVE OF
SUPERCELLS... SHOULD FURTHER STRENGTHEN AS EXIT REGION OF 100+ KT
250 MB JET STREAK CONTINUES ESE ALONG THE CNTRL GULF CST.  ALTHOUGH
WEAK BOUNDARY LAYER INSTABILITY/RESIDUAL RAIN-COOLED SFC LAYER
LIKELY WILL MITIGATE OVERALL SVR THREAT...POTENTIAL WILL
NEVERTHELESS EXIST FOR SPORADIC DMGG WIND GUSTS AND TORNADOES.  THE
LATTER THREAT MAY BE GREATEST WITH EMBEDDED SUPERCELLS IN THE
QLCS...AND WITH ANY MORE DISCRETE/LONGER-LASTING STRUCTURES NEAR
WARM FRONT.  OVERALL THREAT SHOULD SHIFT GRADUALLY ENE WITH TIME.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.
MEAN STORM MOTION VECTOR 24040.


...CORFIDI

Tornado Watches in Alabama, 2010Tornado Watches in Florida, 2010Every tornado watch in 2010

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.