Severe Thunderstorm Watch 358

Issued

Jun 5, 2012, 12:24 PM EDT (16:24 UTC)

Expired

Jun 5, 2012, 9:00 PM EDT

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

Two or more tornadoes

20%

One or more EF2 to EF5 tornadoes

5%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1069Jun 5, 11:42 AM EDT
• Mesoscale Discussion 1073Jun 5, 3:34 PM EDT
• Mesoscale Discussion 1075Jun 5, 4:50 PM EDT
• Mesoscale Discussion 1078Jun 5, 7:26 PM EDT

871 
WWUS20 KWNS 051626
SEL8
SPC WW 051626
ALZ000-FLZ000-GAZ000-SCZ000-CWZ000-060100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 358
NWS STORM PREDICTION CENTER NORMAN OK
1225 PM EDT TUE JUN 5 2012

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

       FAR SOUTHEAST ALABAMA
       NORTHERN FLORIDA
       CENTRAL AND SOUTHERN GEORGIA
       FAR SOUTHERN SOUTH CAROLINA
       COASTAL WATERS

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1225 PM UNTIL
900 PM EDT.

HAIL TO 2 INCHES 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 75
STATUTE MILES EITHER SIDE OF A LINE FROM 20 MILES EAST OF
BRUNSWICK GEORGIA TO 45 MILES NORTH OF MARIANNA FLORIDA.  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 EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY THIS AFTERNOON ALONG AND AHEAD OF COLD FRONT SETTLING SWD
THROUGH THE REGION.  MODIFICATION OF 12Z OBSERVED SOUNDINGS WITH
CURRENT SURFACE CONDITIONS SUGGESTS THAT AIR MASS IS ALREADY
MODERATELY UNSTABLE /I.E. MLCAPE OF 1000-2000 J PER KG/ WITH LITTLE
OR NO CONVECTIVE INHIBITION.  WHEN COUPLED WITH 30-40 KT OF DEEP
WNWLY SHEAR...SETUP WILL FAVOR THE DEVELOPMENT OF SUPERCELLS AND
BOWING STRUCTURES CAPABLE OF DAMAGING WINDS AND LARGE HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 29035.


...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.