Tornado Watch 838

Issued

Nov 29, 2001, 8:15 AM CST (14:15 UTC)

Expired

Nov 29, 2001, 1:00 PM CST

In force

5 hr

Issued by

the Storm Prediction Center

000 
WWUS20 KWNS 291358
SEL8  

SEL8  
SPC WW 291353
LAZ000-MSZ000-291900-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 838
STORM PREDICTION CENTER NORMAN OK
753 AM CST THU NOV 29 2001

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

   SOUTHEAST LOUISIANA                          
   CENTRAL AND SOUTHERN MISSISSIPPI                        

EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 815 AM UNTIL 100
PM CST.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 80 STATUTE MILES EAST AND WEST
OF A LINE FROM 80 MILES SOUTHEAST OF NATCHEZ MISSISSIPPI TO 25
MILES EAST NORTHEAST OF GREENWOOD MISSISSIPPI.

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 SEVERE
THUNDERSTORM WATCH NUMBER 837.  WATCH NUMBER 837 WILL NOT BE IN
EFFECT AFTER 815 AM CST.

DISCUSSION...WARM ADVECTION WING ON RADAR IS MOVING RAPIDLY NNEWD
INTO WARM SECTOR.  AIR MASS IS MARGINALLY UNSTABLE ATTM...HOWEVER
VAD WIND PROFILES SHOW STRONG VERTICAL SHEAR WITH STORM RELATIVE
HELICITIES BETWEEN 200 AND 300 M2/S2.  

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. 
MEAN STORM MOTION VECTOR 22040.


...MCCARTHY

304,0914 333,0910 333,0881 304,0890

Tornado Watches in Mississippi, 2001Tornado Watches in Louisiana, 2001Every tornado watch in 2001

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.