Tornado Watch 411

Issued

Jun 11, 2002, 5:15 PM CDT (22:15 UTC)

Expired

Jun 11, 2002, 11:00 PM CDT

In force

6 hr

Issued by

the Storm Prediction Center

The Pleasant Hill radar (KEAX), 113 km from the middle of the area, began a volume at 22:15 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

000 
WWUS20 KWNS 112212
SEL1  
SPC WW 112203
ILZ000-KSZ000-MOZ000-120400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 411
STORM PREDICTION CENTER NORMAN OK
503 PM CDT TUE JUN 11 2002

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

   WEST CENTRAL ILLINOIS                           
   FAR EASTERN KANSAS                             
   CENTRAL AND NORTHERN MISSOURI                           

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 515 PM UNTIL 1100
PM CDT.

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

THE TORNADO WATCH AREA IS ALONG AND 70 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 25 MILES NORTHWEST OF LEAVENWORTH KANSAS TO 20
MILES SOUTHEAST 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...  CONTINUE...WW 410...

DISCUSSION...SMALL MCS WITH EMBEDDED SUPERCELLS NOW OVER CNTRL MO
EXPECTED TO MOVE GENERALLY ESE...WITH ATTENDANT THREAT FOR ISOLATED
TORNADOES/WET MICROBURSTS GIVEN RICH BOUNDARY LAYER MOISTURE/STEEP
MID LEVEL LAPSE RATES AND PRESENCE OF FAVORABLY-ORIENTED OUTFLOW
BOUNDARY.  OTHER STORMS/SUPERCELLS EXPECTED TO DEVELOP UPSTREAM
ACROSS NE KS/NW MO...WHERE A POTENT COMBINATION OF SHEAR/
INSTABILITY APPEARS TO BE PRESENT PER 20Z TOPEKA RAOB.  GIVEN
RELATIVELY WEAK LOW LEVEL SHEAR...TORNADO THREAT EXPECTED TO BE
MAXIMIZED INVOF BOUNDARY INTERSECTIONS. 

AVIATION...TORNADOES AND 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 600. 
MEAN STORM MOTION VECTOR 28030.

...CORFIDI

403,0951 393,0900 373,0900 383,0951

Tornado Watches in Missouri, 2002Tornado Watches in Illinois, 2002Tornado Watches in Kansas, 2002Every tornado watch in 2002

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; radar from the NEXRAD Level II archive.