Tornado Watch 593

Issued

Aug 28, 2012, 6:47 PM CDT (23:47 UTC)

Expired

Aug 29, 2012, 4:00 PM CDT

In force

21 hr

Issued by

the Storm Prediction Center

Largest hail expected

0.5 in

Strongest gust expected

65 kt

The Mobile radar (KMOB), 51 km from the middle of the area, began a volume at 23:47 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

20%

Ten or more severe wind reports

20%

One or more gusts of 65 knots or more

10%

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

60%

• Mesoscale Discussion 1828Aug 28, 3:46 PM CDT
• Mesoscale Discussion 1829Aug 28, 5:48 PM CDT
• Mesoscale Discussion 1830Aug 29, 1:55 AM CDT
• Mesoscale Discussion 1831Aug 29, 5:46 AM CDT
• Mesoscale Discussion 1832Aug 29, 11:48 AM CDT
• Mesoscale Discussion 1834Aug 29, 3:17 PM CDT

239 
WWUS20 KWNS 290004
SEL3
SPC WW 290004
ALZ000-FLZ000-LAZ000-MSZ000-CWZ000-291200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 593
NWS STORM PREDICTION CENTER NORMAN OK
650 PM CDT TUE AUG 28 2012

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

       SOUTHWEST ALABAMA
       WESTERN FLORIDA PANHANDLE
       SOUTHEAST LOUISIANA
       SOUTHERN MISSISSIPPI
       COASTAL WATERS

EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 650 PM
UNTIL 700 AM CDT.

TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 50 MILES NORTH NORTHWEST OF
HOUMA LOUISIANA TO 35 MILES NORTH NORTHEAST OF PANAMA CITY
FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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 591...TORNADO WATCH NUMBER 592. WATCH NUMBER 591 592
WILL NOT BE IN EFFECT AFTER 650 PM CDT.

DISCUSSION...CONVECTION/STORMS APPEAR TO HAVE STRENGTHENED/INCREASED
IN COVERAGE OVER THE PAST 2-3 HRS NEAR CENTER OF HRCN ISAAC...NOW
LOCATED SSW OF BOOTHVILLE LA /BVE/. THE SYSTEM ALSO APPEARS TO HAVE
DEVELOPED MORE HIGH-LVL OUTFLOW. AS ISAAC CONTINUES SLOWLY
NWWD...THESE FACTORS COULD RESULT IN INCREASINGLY MOISTURE-RICH
LOW-LVL AIR BEING DRAWN N AND NWWD TO E OF CIRCULATION CENTER.
AREA VWP DATA SHOW ENVELOPE OF WIND PROFILES FAVORABLE FOR LOW-LVL
ROTATION/POSSIBLE TORNADOES EXTENDING WELL N /INLAND/ AND E FROM
CENTER OF ISAAC. WITH LOSS OF DAYTIME HEATING...HOWEVER...EXPECT
THAT AREAS FOR POTENTIAL SHOWER/TSTM DEVELOPMENT THROUGH THE
OVERNIGHT WILL CONTRACT SOMEWHAT TOWARD ISAAC/S CORE...INTO EXISTING
AND FUTURE CONFLUENCE BANDS E AND N OF CIRCULATION CENTER.
AN INCREASE IN DEEP-LAYER MOISTURE MAY MAKE STORMS IN THE CONFLUENCE
BANDS SOMEWHAT LESS OUTFLOW-DOMINANT THAN THEY HAVE BEEN OVER THE
PAST TWO DAYS. THIS COULD BE FOLLOWED BY AN INCREASING RISK FOR
TORNADOES IF CONVECTION DOES CONTINUE TO FORM ALONG THE BANDS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 15040.


...CORFIDI

Tornado Watches in Louisiana, 2012Tornado Watches in Mississippi, 2012Tornado Watches in Alabama, 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.