Tornado Watch 28

Issued

Feb 18, 2012, 9:55 AM CST (15:55 UTC)

Expired

Feb 18, 2012, 5:00 PM CST

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

65 kt

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

40%

Ten or more severe hail reports

20%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 124Feb 18, 8:29 AM CST
• Mesoscale Discussion 125Feb 18, 9:31 AM CST
• Mesoscale Discussion 126Feb 18, 11:21 AM CST
• Mesoscale Discussion 127Feb 18, 1:03 PM CST
• Mesoscale Discussion 128Feb 18, 2:02 PM CST
• Mesoscale Discussion 129Feb 18, 2:21 PM CST
• Mesoscale Discussion 130Feb 18, 3:41 PM CST
• Mesoscale Discussion 131Feb 18, 4:29 PM CST

988 
WWUS20 KWNS 181555
SEL8  
SPC WW 181555
LAZ000-MSZ000-CWZ000-182100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 28
NWS STORM PREDICTION CENTER NORMAN OK
955 AM CST SAT FEB 18 2012

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

       SOUTHEAST LOUISIANA
       EXTREME SOUTHERN MISSISSIPPI
       COASTAL WATERS

EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 955 AM UNTIL
300 PM CST.

TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 110 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHWEST OF SLIDELL
LOUISIANA TO 45 MILES SOUTHEAST OF HOUMA LOUISIANA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU8).

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.

DISCUSSION...STG UPR TROUGH ACRS TX ATTM WILL EJECT NEWD ACROSS
ARKLATEX THROUGH TODAY WITH 12H 500MB HGT FALLS OF 60-90M AFFECTING
NWRN GULF COAST AND LOWER MS VALLEY THROUGH TONIGHT. WELL-FORMED
MESOLOW AND ASSOCIATED BOW/LEWP STRUCTURE WAS LEADING THE SYNOPTIC
CYCLONE AND IS EXPECTED TO MAINTAIN STRUCTURE AND INTENSITY AS IT
TRACKS EAST ALONG WARM FRONT. WITH SHEAR AND SURFACE-BASED
INSTABILITY LIKELY TO INCREASE AHEAD OF THIS SMALLER-SCALE
DISTURBANCE THE THREAT FOR DAMAGING WINDS AND A COUPLE OF TORNADOES
SHOULD LIKEWISE INCREASE ACROSS THE MS DELTA REGION THROUGH THIS
AFTERNOON.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 24045.


...CARBIN

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