Alert archive / Illinois / Tornado Warnings in 1993

Tornado Warning 17, NWS Lincoln, IL

July 8, 1993Boone County, DeKalb County, Illinois

NWS Lincoln, IL issued this tornado warning at Jul 8, 1993, 1:31 PM CDT for Boone County, DeKalb County, Illinois. It was in force for 29 min.

The area

The counties it named.

The facts

Issued
Jul 8, 1993, 1:31 PM CDT (18:31 UTC)
Expired
Jul 8, 1993, 2:00 PM CDT
In force
29 min
Issued by
NWS Lincoln, IL
Area
Whole counties

Counties Boone County, IL, DeKalb County, IL

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 6.5 hours before the alert went out and 270 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, Green Bay/Straub, WI at 12:00Z on 1993-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 6 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, Green Bay/Straub, WI at 12:00Z on 1993-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.19395878Sfc1 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
6 J/kg
Mixed-layer CIN
-72 J/kg
Mixed-layer LCL
687 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
46 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 KCHI 081834 RRA
TORRFD
ILC007-037-081900-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ROCKFORD IL
ISSUED BY CHICAGO IL
131 PM CDT THU JUL 8 1993
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  200 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN NORTH CENTRAL ILLINOIS
 
   ...EASTERN BOONE COUNTY...DE KALB COUNTY
 
AT 1 30 PM CDT A LINE OF SEVERE THUNDERSTORMS WAS LOCATED FROM NEAR
DEKALB TO BELVIDERE. AT 1 00 PM CDT A TORNADO WAS REPORTED AT ASHTON
IN EASTERN LEE COUNTY ASSOCIATED WITH THESE THUNDERSTORMS.
 
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS IN A
BASEMENT.  GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE.
IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM
SUCH AS A CLOSET ON THE LOWEST FLOOR.  USE BLANKETS...PILLOWS...
OR CUSHIONS TO COVER YOUR BODY. GET AWAY FROM WINDOWS!

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 8, 1:18 PM CDTTornado WarningILXOgle, Winnebago42 min
Jul 8, 1:34 PM CDTTornado WarningILXBoone, DeKalb41 min

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.