Alert archive / Illinois / Tornado Warnings in 1990

Tornado Warning 30, NWS Lincoln, IL

August 29, 1990DeWitt County, Macon County, Illinois

NWS Lincoln, IL issued this tornado warning at Aug 29, 1990, 2:40 AM CDT for DeWitt County, Macon County, Illinois. It was in force for 35 min.

The area

The counties it named.

The facts

Issued
Aug 29, 1990, 2:40 AM CDT (07:40 UTC)
Expired
Aug 29, 1990, 3:15 AM CDT
In force
35 min
Issued by
NWS Lincoln, IL
Area
Whole counties

Counties DeWitt County, IL, Macon County, IL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Paducah/Barkley, KY (KPAH), launched 00:00Z, 7.7 hours before the alert went out and 328 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Paducah/Barkley, KY at 00:00Z on 1990-08-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1355 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Paducah/Barkley, KY at 00:00Z on 1990-08-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1355 J/kg
Mixed-layer CIN
-80 J/kg
Mixed-layer LCL
1963 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
107 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KSPI 290740
TORSPI
ILC039-115-290815-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING 
NATIONAL WEATHER SERVICE SPRINGFIELD IL
240 AM CDT WED AUG 29 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 315 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE CENTRAL PART OF ILLINOIS
      DE WITT...MACON

AT 23SAM CDT SPOTTERS IN DEWITT COUNTY REPORTED AN UNCONFIRMED
FUNNEL CLOUD IN DEWITT COUNTY SOUTHWEST OF CLINTON.  IT IS
ASSOCIATED WITH A BAND OF SEVERE THUNDERSTORMS THAT ARE MOVING
SOUTHEASTWARD AT 30 MPH THROUGH THESE COUNTIES.

FUNNEL CLOUDS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE
OR NO ADVANCE WARNING...SO BE ON THE LOOKOUT AND BE PREPARED TO MOVE
TO A PLACE OF SAFETY.

IF YOU ARE IN THE PATH OF A TORNADO...GO TO A BASEMENT SHELTER
IF AVAILABLE...OTHERWISE TO A CENTRAL INTERIOR ROOM ON THE LOWEST
FLOOR.  ABANDON CARS AND MOBILE HOMES FOR A REINFORCED BUILDIN*G.

THIS IS A DANGEROUS STORM.  TAKE COVER IMMEDIATELY.

 ATTN ISP DIST...6...10
 MUNDY

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 29, 1:06 AM CDTSevere Thunderstorm WarningILXFulton, Knox, Peoria69 min
Aug 29, 1:33 AM CDTSevere Thunderstorm WarningILXMason, Tazewell57 min
Aug 29, 1:57 AM CDTSevere Thunderstorm WarningILXMcLean63 min
Aug 29, 2:26 AM CDTSevere Thunderstorm WarningILXDeWitt, Logan, Macon, Piatt64 min
Aug 29, 3:11 AM CDTSevere Thunderstorm WarningILXChampaign, Douglas64 min
Aug 29, 3:11 AM CDTSevere Thunderstorm WarningILXMoultrie64 min
Aug 29, 3:20 AM CDTSevere Thunderstorm WarningILXVermilion55 min
Aug 29, 3:29 AM CDTSevere Thunderstorm WarningILXCass, Morgan, Sangamon61 min
Aug 29, 3:29 AM CDTSevere Thunderstorm WarningILXMenard61 min
Aug 29, 4:18 AM CDTSevere Thunderstorm WarningILXChristian, Shelby57 min
Aug 29, 4:47 AM CDTSevere Thunderstorm WarningILXHancock, McDonough58 min
Aug 29, 5:01 AM CDTSevere Thunderstorm WarningILXSchuyler59 min
Aug 29, 5:23 AM CDTSevere Thunderstorm WarningILXCass, Morgan67 min
Aug 29, 5:30 AM CDTSevere Thunderstorm WarningILXMacon, Moultrie, Shelby60 min
Aug 29, 6:05 AM CDTSevere Thunderstorm WarningILXLogan, Menard, Sangamon27 min
Aug 29, 6:34 AM CDTSevere Thunderstorm WarningILXMcDonough, Schuyler26 min
Aug 29, 6:34 AM CDTSevere Thunderstorm WarningILXFulton, Mason56 min
Aug 29, 7:28 AM CDTSevere Thunderstorm WarningILXColes, Douglas32 min

Nearby

Tornado Warnings in Illinois, 1990Every tornado warning in 1990Tornadoes in 1990

Sources

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.