URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 33
STORM PREDICTION CENTER NORMAN OK
313 PM CST SAT FEB 24 2001

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

SOUTHWEST ILLINOIS
SOUTHERN AND EASTERN MISSOURI

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 330 PM UNTIL 900
PM CST.

HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 85 STATUTE MILES
EAST AND WEST OF A LINE FROM 40 MILES EAST SOUTHEAST OF WEST PLAINS
MISSOURI TO 5 MILES NORTH NORTHWEST OF SAINT LOUIS MISSOURI.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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 30...WW 31...WW 32...

DISCUSSION...WELL-DEFINED SQUALL LINE IS MOVING ENEWD AT 40-50 KT
INTO CENTRAL MO IN ADVANCE OF THE STRONG MID-UPPER JET OVER OK.
THOUGH THERE HAS BEEN SOME SURFACE HEATING/ MOISTENING IN SE MO...A
RESIDUAL COOL BOUNDARY LAYER APPEARS TO BE LIMITING SURFACE-BASED
INSTABILITY.  THE COOL BOUNDARY LAYER WILL TEND TO LIMIT THE
TORNADO THREAT.  HOWEVER...TEMPERATURE PROFILES NEAR THE SURFACE
ARE CLOSE TO NEUTRAL AND SHOULD ALLOW THE STRONGER WINDS WITH THE
BOW ECHOES TO REACH THE SURFACE ACROSS SRN/ERN MO...AND SW IL LATER
THIS EVENING.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS.
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.  MEAN STORM MOTION
VECTOR 23050.


...THOMPSON

;384,0884 363,0894 363,0924 384,0915;