[LeArc] Weather Watch : 9@ 4/27/02 6:10:18 PM

[learc@mailman.qth.net]

The following weather message is provided by McDonough County E.S.D.A.


WWUS20 KWNS 272312
SEL9  
SPC WW 272306
ILZ000-MOZ000-280500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 159
STORM PREDICTION CENTER NORMAN OK
606 PM CDT SAT APR 27 2002

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

   WESTERN ILLINOIS                           
   CENTRAL AND EASTERN MISSOURI                           

EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 630 PM UNTIL
MIDNIGHT CDT.

 ...THIS IS A PARTICULARLY DANGEROUS SITUATION...
 
DAMAGING TORNADOES...LARGE 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 100 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 20 MILES SOUTHWEST OF KNOB NOSTER MISSOURI TO
40 MILES NORTH NORTHEAST OF SAINT LOUIS MISSOURI.

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 TORNADO WATCH
NUMBER 157.  WATCH NUMBER 157 WILL NOT BE IN EFFECT AFTER 630 PM
CDT.  CONTINUE...WW 158...

DISCUSSION...ISOLATED THUNDERSTORMS ARE SLOWLY INTENSIFYING OVER
PARTS OF WESTERN MO ALONG/AHEAD OF SURFACE DRYLINE.  EXTREMELY
STRONG SHEAR PROFILES...RAPID AIRMASS DESTABILIZATION...AND STRONG
SURFACE PRESSURE FALLS SUGGEST THE POTENTIAL FOR THESE STORMS TO
BECOME TORNADIC SUPERCELLS IN THE NEXT 1-3 HOURS.  SIGNIFICANT
TORNAODES APPEAR POSSIBLE IN THIS REGION.  VERY STRONG WINDS ALOFT
AND DRY MID LEVEL AIRMASS ALSO SUGGEST POTENTIAL FOR DAMAGING WINDS
AND LARGE HAIL.

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 24045.

...HART

;375,0900 370,0934 395,0934 404,0900;
WWWW