Tornado Watch 42

Issued

Feb 25, 2013, 12:26 PM CST (18:26 UTC)

Expired

Feb 25, 2013, 9:57 PM CST

In force

10 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

65 kt

Two or more tornadoes

60%

One or more EF2 to EF5 tornadoes

30%

Ten or more severe wind reports

70%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

80%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 218Feb 25, 9:07 AM CST
• Mesoscale Discussion 219Feb 25, 9:25 AM CST
• Mesoscale Discussion 222Feb 25, 2:15 PM CST
• Mesoscale Discussion 223Feb 25, 2:52 PM CST
• Mesoscale Discussion 226Feb 25, 6:43 PM CST

181 
WWUS20 KWNS 251832
SEL2  
SPC WW 251832
ARZ000-LAZ000-MSZ000-TXZ000-CWZ000-260200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 42
NWS STORM PREDICTION CENTER NORMAN OK
1230 PM CST MON FEB 25 2013

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

       SOUTHERN ARKANSAS
       LOUISIANA
       WESTERN MISSISSIPPI
       FAR EASTERN TEXAS
       COASTAL WATERS

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 1230 PM UNTIL
800 PM CST.

TORNADOES...HAIL TO 2 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 115 STATUTE
MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH NORTHWEST OF
MONROE LOUISIANA TO 50 MILES SOUTHEAST OF INTRACOASTAL CITY
LOUISIANA.  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.

OTHER WATCH INFORMATION...CONTINUE...WW 41...

DISCUSSION...TSTMS EXPECTED TO INCREASE IN COVERAGE AND STRENGTH
THROUGH EARLY EVE OVER WW AREA AS PRESSURE FALLS AND UPR DIVERGENCE
ASSOCIATED WITH THE CONTINUED ENE ADVANCE OF TX UPR LOW...AND SFC
HEATING...DESTABILIZE AREA ALONG AND N OF DIFFUSE WNW-ESE WARM FRONT
NOW OVER SRN LA. SSW TO SWLY DEEP SHEAR..ALREADY ADEQUATE FOR
SUPERCELLS...SHOULD FURTHER STRENGTHEN TO AOA 60 KTS...WHILE SFC
DEWPOINTS RISE WELL INTO THE 60S F NWD TO NEAR THE LA-AR BORDER. 
TORNADO THREAT SHOULD INCREASE WITH TIME AS EXISTING SLIGHTLY
ELEVATED WAA STORMS BECOME ROOTED IN THE BOUNDARY LAYER ACROSS
SRN/CNTRL LA...AND OTHER STORMS ARISE FROM PRE-COLD-FRONTAL
CONFLUENCE ZONE OVER FAR E TX/NW LA. THE STORMS FORMING IN THE
LATTER AREA MAY MERGE INTO A BKN SQLN LATER THIS AFTN...WITH RISK OF
BOWING STRUCTURES/HIGH WIND IN ADDITION TO SVR HAIL/ISOLD TORNADOES.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 22040.


...CORFIDI

Tornado Watches in Louisiana, 2013Tornado Watches in Mississippi, 2013Tornado Watches in Arkansas, 2013Every tornado watch in 2013

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.