Alert archive / Illinois / Tornado Warnings in 1993

Tornado Warning 21, NWS Lincoln, IL

July 18, 1993Shelby County, Illinois

NWS Lincoln, IL issued this tornado warning at Jul 18, 1993, 7:47 PM CDT for Shelby County, Illinois. It was in force for 23 min.

The area

The counties it named.

The facts

Issued
Jul 18, 1993, 7:47 PM CDT (00:47 UTC)
Expired
Jul 18, 1993, 8:10 PM CDT
In force
23 min
Issued by
NWS Lincoln, IL
Area
Whole counties

County Shelby County, IL

The nearest sounding before it

Paducah/Barkley, KY (KPAH), launched 00:00Z, 0.8 hours before the alert went out and 258 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 1993-07-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2529 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Paducah/Barkley, KY at 00:00Z on 1993-07-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 square meters per square second.1939Sfc1 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
2529 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1386 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
49 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSPI 190047
TORSPI
ILC173-190115-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING 
NATIONAL WEATHER SERVICE SPRINGFIELD IL
747 PM CDT SUN JUL 18 1993

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 815 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY

   IN THE CENTRAL PART OF ILLINOIS
      CENTRAL AND EASTERN SHELBY

AT 742 PM CDT...SHELBY ELECTRIC COOP CREW REPORTED A TORNADO ON
ROUTE 16 ABOUT 3 MILES WEST OF SHELBYVILLE...WHICH IS 32 MILES
SOUTHEAST OF DECATUR.

THE TORNADO WAS MOVING EAST NORTHEAST AT 30 MPH.

TOWNS AND COMMUNITIES IN AND NEAR THE PATH OF THIS TORNADO ARE
SHELBYVILLE...WINDSOR.

BOATERS ON THE SOUTHERN EDGE OF LAKE SHELBYVILLE SHOULD TAKE COVER.

IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A BASEMENT.
GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE.  IF NO BASEMENT
IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM ON THE LOWEST FLOOR.
USE BLANKETS OR PILLOWS TO COVER YOUR BODY.  AVOID WINDOWS.

AUTEN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 7:11 PM CDTSevere Thunderstorm WarningILXChampaign34 min
Jul 18, 7:31 PM CDTFlash Flood WarningILXDeKalb119 min
Jul 18, 9:55 PM CDTFlash Flood WarningILXDeKalb3 hr

Nearby

Tornado Warnings in Illinois, 1993Every tornado warning in 1993Tornadoes in 1993

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.