Severe Thunderstorm Watch 488

Issued

Jul 17, 2012, 11:49 AM CDT (16:49 UTC)

Expired

Jul 17, 2012, 7:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

The Tallahassee radar (KTLH), 33 km from the middle of the area, began a volume at 16:53 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

20%

One or more EF2 to EF5 tornadoes

5%

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 1481Jul 17, 11:21 AM CDT
• Mesoscale Discussion 1485Jul 17, 2:45 PM CDT

807 
WWUS20 KWNS 171648
SEL8
SPC WW 171648
ALZ000-FLZ000-GAZ000-CWZ000-180000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 488
NWS STORM PREDICTION CENTER NORMAN OK
1250 PM EDT TUE JUL 17 2012

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

       FAR SOUTHEAST ALABAMA
       NORTHERN FLORIDA INCLUDING THE PANHANDLE
       SOUTHERN GEORGIA
       COASTAL WATERS

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL
800 PM EDT.

HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80
STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES EAST OF
APALACHICOLA FLORIDA TO 60 MILES NORTHEAST OF ALBANY GEORGIA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU8).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

DISCUSSION...TSTMS ARE RAPIDLY DEVELOPING THIS AFTERNOON AHEAD OF A
WEAK SURFACE LOW AND ALONG A LEE TROUGH WITHIN A THERMODYNAMIC
ENVIRONMENT FEATURING MLCAPE VALUES OF 3000+ J/KG.  WHILE VERTICAL
SHEAR WILL REMAIN WEAK ACROSS THE REGION...HIGH MOISTURE CONTENT
WILL FOSTER INTENSE WET MICROBURSTS CAPABLE OF DAMAGING WINDS.  SOME
HAIL IS ALSO POSSIBLE.

AVIATION...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 550. MEAN STORM MOTION
VECTOR 36010.


...MEAD

Severe Thunderstorm Watches in Georgia, 2012Severe Thunderstorm Watches in Florida, 2012Every severe thunderstorm 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.