Tornado Watch 66

Issued

Mar 25, 2009, 8:54 PM CDT (01:54 UTC)

Expired

Mar 26, 2009, 4:00 AM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

70 kt

Two or more tornadoes

60%

One or more EF2 to EF5 tornadoes

40%

Ten or more severe wind reports

70%

One or more gusts of 65 knots or more

40%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 264Mar 25, 5:29 PM CDT
• Mesoscale Discussion 266Mar 25, 8:32 PM CDT
• Mesoscale Discussion 267Mar 25, 11:38 PM CDT

704 
WWUS20 KWNS 260156
SEL6  
SPC WW 260156
LAZ000-MSZ000-CWZ000-260800-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 66
NWS STORM PREDICTION CENTER NORMAN OK
855 PM CDT WED MAR 25 2009

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

       SOUTHERN AND EASTERN LOUISIANA
       CENTRAL MISSISSIPPI
       COASTAL WATERS

EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 855 PM
UNTIL 300 AM CDT.

TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES SOUTHWEST OF
INTRACOASTAL CITY LOUISIANA TO 55 MILES NORTHWEST OF JACKSON
MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

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 63...WW 64...WW 65...

DISCUSSION...WELL ORGANIZED LINE OF THUNDERSTORMS...IN THE FORM OF
SUPERCELLS AND BOW ECHOES...WILL CONTINUE RACING EWD ACROSS THE
LOWER MS RIVER VALLEY TONIGHT.  ISOLATED SUPERCELL DEVELOPMENT CAN
ALSO BE EXPECTED AHEAD OF THIS MAIN LINE OF STORMS AS STRONG SSWLY
LLJ OVERSPREADS THE AREA.  GREATEST LOW LEVEL SHEAR WILL REMAIN
CONCENTRATED WHERE THIS LINE STRADDLES SURFACE WARM FRONT...ALTHOUGH
SHEAR WILL REMAIN QUITE STRONG ACROSS THE WHOLE REGION.  WIND
DAMAGE...LARGE HAIL AND ISOLATED TORNADOES CAN ALL BE EXPECTED
OVERNIGHT ALONG AND AHEAD OF QUASI-LINEAR CONVECTIVE SYSTEM.  WIND
DAMAGE MAY BECOME PARAMOUNT IF ORGANIZED BOW ECHO CAN BE SUSTAINED.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 27040.


...EVANS

Tornado Watches in Louisiana, 2009Tornado Watches in Mississippi, 2009Every tornado watch in 2009

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.