Tornado Watch 186

Issued

Apr 20, 2000, 10:00 AM CDT (15:00 UTC)

Expired

Apr 20, 2000, 4:00 PM CDT

In force

6 hr

Issued by

the Storm Prediction Center

The Lincoln radar (KILX), 124 km from the middle of the area, began a volume at 15:08 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.

760 
WWUS9 KMKC 201428
SEL6  

SEL6  
MKC WW 201428
ILZ000-INZ000-LMZ000-202100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 186
STORM PREDICTION CENTER NORMAN OK
928 AM CDT THU APR 20 2000

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

   EASTERN AND SOUTHERN ILLINOIS                           
   NORTHERN AND INDIANA                            
   EXTREME SOUTHERN LAKE MICHIGAN                      

EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 1000 AM UNTIL
400 PM CDT.

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 70 STATUTE MILES EAST AND WEST
OF A LINE FROM 30 MILES SOUTH SOUTHEAST OF MOUNT VERNON ILLINOIS TO
25 MILES WEST NORTHWEST OF SOUTH BEND INDIANA.

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 185.  WATCH NUMBER 185 WILL NOT BE IN
EFFECT AFTER 1000 AM CDT.

DISCUSSION...LINE OF STRONG/SEVERE THUNDERSTORMS OVER
CENTRAL/SOUTHERN ILLINOIS IS EXPECTED TO MOVE NEWD WITH NEW CELLS
FORMING ALONG SOUTHERN END OF THE LINE.  CONVECTION IS AHEAD OF
VIGOROUS UPPER TROUGH THAT IS DEEPENING INTO THE MIDDLE MISSISSIPPI
VALLEY...WITH STRONG DYNAMIC FORCING SPREADING INTO THE REGION. 
CLEAR AREA AHEAD OF THE LINE WILL ALLOW STRONG HEATING TO OCCUR
WHICH WILL CONTRIBUTE TO DESTABILIZATION WITH MUCAPE OF 2000-3000
J/KG.  STRONG WINDS ALOFT/VERTICAL SHEAR WILL ENHANCE STORM
ORGANIZATION AND INCREASE POTENTIAL FOR SUPERCELLS.

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 500. 
MEAN STORM MOTION VECTOR 22040.


...WEISS

375,0895 414,0880 414,0852 375,0872

Tornado Watches in Indiana, 2000Tornado Watches in Illinois, 2000Tornado Watches in Michigan, 2000Every tornado 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; radar from the NEXRAD Level II archive.