Tornado Watch 424

Issued

Jun 25, 2012, 4:37 AM EDT (08:37 UTC)

Expired

Jun 25, 2012, 1:59 PM EDT

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

0.5 in

Strongest gust expected

60 kt

The Tampa radar (KTBW), 138 km from the middle of the area, began a volume at 08:37 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

50%

One or more EF2 to EF5 tornadoes

30%

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

30%

• Mesoscale Discussion 1265Jun 25, 12:46 AM EDT
• Mesoscale Discussion 1267Jun 25, 4:07 AM EDT
• Mesoscale Discussion 1271Jun 25, 12:06 PM EDT

606 
WWUS20 KWNS 250844
SEL4
SPC WW 250844
FLZ000-CWZ000-251800-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 424
NWS STORM PREDICTION CENTER NORMAN OK
440 AM EDT MON JUN 25 2012

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

       NORTHERN AND CENTRAL FLORIDA
       COASTAL WATERS

EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 440 AM UNTIL 200
PM EDT.

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 85 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH OF CROSS CITY
FLORIDA TO 30 MILES SOUTH OF AVON PARK FLORIDA.  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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 423. WATCH NUMBER 423 WILL NOT BE IN EFFECT AFTER
440 AM EDT.

DISCUSSION...WHILE OVERALL TORNADO POTENTIAL HAS MARGINALLY SUBSIDED
ACROSS FL EARLY TODAY WITH THE LACK OF MORE WIDESPREAD
CONVECTION...STRONG DEEP-LAYER WIND FIELDS AND INTENSE LOW LEVEL
SHEAR WITHIN THE LARGER CIRCULATION OF T.S. DEBBY WILL CONTINUE TO
SUPPORT UPDRAFT ROTATION AND THE POTENTIAL FOR MINI-SUPERCELL
FORMATION. A PERSISTENT TROPICAL RAIN BAND FROM TAMPA BAY AREA NEWD
ACROSS THE PENINSULA IS ONE AREA WHERE THESE BRIEF SPIN UPS MAY
OCCUR OVER THE NEXT COUPLE OF HOURS. LACK OF CONVECTION THROUGH
EARLY IN THE DAYLIGHT HOURS COULD ACTUALLY RESULT IN AN INCREASING
TORNADO THREAT AS VERY MOIST AIRMASS DESTABILIZES FURTHER AND
RESULTS IN MORE ROBUST CONVECTIVE DEVELOPMENT AMIDST PERSISTENTLY
STRONG LOW LEVEL SHEAR ASSOCIATED WITH THE SLOW-MOVING TROPICAL
STORM.

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 21035.


...CARBIN

Tornado Watches in Florida, 2012Every tornado watch in 2012

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.