Severe Thunderstorm Watch 253

Issued

May 9, 2000, 2:30 PM CDT (19:30 UTC)

Expired

May 9, 2000, 9:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

784 
WWUS9 KMKC 091908
SEL3  

SEL3  
MKC WW 091908
ILZ000-INZ000-100200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 253
STORM PREDICTION CENTER NORMAN OK
208 PM CDT TUE MAY 9 2000

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

   EASTERN AND SOUTHERN ILLINOIS                           
   NORTHERN AND WESTERN INDIANA                            

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 230 PM UNTIL 900
PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 70 STATUTE MILES
EAST AND WEST OF A LINE FROM 40 MILES EAST SOUTHEAST OF CARBONDALE
ILLINOIS TO 55 MILES NORTH NORTHWEST OF FORT WAYNE INDIANA.

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.


DISCUSSION...THUNDERSTORMS WILL INCREASE AHEAD OF COLD FRONT AND
UPPER TROUGH AXIS AS THEY APPROACH MOISTURE AND INSTABILITY AXIS.
STEEP LAPSE RATES...MODERATE TO HIGH INSTABILITY AND 
UNIDIRECTIONAL WIND SHEAR INDICATE PRIMARY THREAT OF LARGE HAIL AND
WIND DAMAGE.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM
MOTION VECTOR 24035.

...ROGASH

414,0842 373,0871 373,0895 414,0870

Severe Thunderstorm Watches in Indiana, 2000Severe Thunderstorm Watches in Illinois, 2000Severe Thunderstorm Watches in Kentucky, 2000Every severe thunderstorm watch in 2000

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.