Tornado Watch 792

Issued

Dec 2, 2009, 7:44 PM EST (00:44 UTC)

Expired

Dec 3, 2009, 4:00 AM EST

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

The Tampa radar (KTBW), 74 km from the middle of the area, began a volume at 00:46 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

30%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

5%

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 2190Dec 2, 6:39 PM EST
• Mesoscale Discussion 2192Dec 2, 10:08 PM EST

197 
WWUS20 KWNS 030050
SEL2  
SPC WW 030050
FLZ000-CWZ000-030900-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 792
NWS STORM PREDICTION CENTER NORMAN OK
745 PM EST WED DEC 2 2009

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

       CENTRAL AND NORTHERN FLORIDA
       COASTAL WATERS

EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 745 PM
UNTIL 400 AM EST.

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 55 STATUTE
MILES EITHER SIDE OF A LINE FROM 30 MILES WEST SOUTHWEST OF
SARASOTA FLORIDA TO 40 MILES EAST SOUTHEAST OF ST AUGUSTINE
FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

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 789...WW 790...WW 791...

DISCUSSION...TSTMS EXPECTED TO PERSIST ALONG ERN GULF OF MEXICO/N FL
COLD FRONT INTO EARLY THU.  BOTH LOW LVL AND DEEP SHEAR GRADUALLY
WILL DECREASE WITH TIME.  BUT SHEAR LIKELY WILL REMAIN SUFFICIENT
FOR SUPERCELLS FOR AT LEAST THE NEXT SEVERAL HOURS.  COUPLED WITH
CONTINUING PRESENCE OF MODERATE SFC-BASED INSTABILITY...HI PW...AND
RELATIVELY WEAK LINEAR FORCING FOR ASCENT...SETUP MAY SUPPORT A
CONTINUED RISK FOR TORNADOES...IN ADDITION TO LOCALLY DMGG WIND.

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 500.
MEAN STORM MOTION VECTOR 24040.


...CORFIDI

Tornado Watches in Florida, 2009Every tornado watch in 2009

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.