Tornado Watch 92

Issued

Mar 20, 2012, 9:46 AM CDT (14:46 UTC)

Expired

Mar 20, 2012, 5:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

Two or more tornadoes

40%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

20%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

10%

One or more hailstones of 2 inches or more

10%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 304Mar 20, 9:03 AM CDT
• Mesoscale Discussion 307Mar 20, 2:26 PM CDT
• Mesoscale Discussion 308Mar 20, 3:47 PM CDT

960 
WWUS20 KWNS 201446
SEL2
SPC WW 201446
LAZ000-TXZ000-CWZ000-202200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 92
NWS STORM PREDICTION CENTER NORMAN OK
945 AM CDT TUE MAR 20 2012

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

       WESTERN LOUISIANA
       EXTREME EAST CENTRAL AND SOUTHEAST TEXAS
       COASTAL WATERS

EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 945 AM UNTIL
500 PM CDT.

TORNADOES...HAIL TO 1 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 40 STATUTE
MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH NORTHEAST OF
SHREVEPORT LOUISIANA TO 45 MILES SOUTH SOUTHEAST OF PORT ARTHUR
TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

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...N-S LINE OF THUNDERSTORMS WILL CONTINUE TO DRIFT EWD
FROM E TX INTO WRN LA IN ADVANCE OF A CLOSED LOW NEAR THE NM/TX
BORDER.  AN INFLUX OF BOUNDARY LAYER DEWPOINTS IN THE MID-UPPER 60S
WILL SUPPORT MODERATE INSTABILITY IN ADVANCE OF THE LINE...DESPITE
CLOUDS THAT WILL SLOW SURFACE HEATING SOMEWHAT.
ADDITIONALLY...LOW-LEVEL SLY SHEAR IS SUFFICIENT FOR CIRCULATIONS IN
THE LINE AND AN ATTENDANT RISK FOR A COUPLE OF TORNADOES AND
ISOLATED DAMAGING GUSTS THROUGH THE AFTERNOON.

AVIATION...TORNADOES AND 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 500.
MEAN STORM MOTION VECTOR 21045.


...THOMPSON

Tornado Watches in Louisiana, 2012Tornado Watches in Texas, 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.