Alert archive / Illinois / Tornado Warnings in 1993

Tornado Warning 18, NWS Lincoln, IL

July 8, 1993Boone County, DeKalb County, Illinois

NWS Lincoln, IL issued this tornado warning at Jul 8, 1993, 1:34 PM CDT for Boone County, DeKalb County, Illinois. It was in force for 41 min.

The area

The counties it named.

The facts

Issued
Jul 8, 1993, 1:34 PM CDT (18:34 UTC)
Expired
Jul 8, 1993, 2:15 PM CDT
In force
41 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, 6.6 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 KRFD 081834
TORRFD
ILC007-037-081915-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING 
NATIONAL WEATHER SERVICE ROCKFORD IL
134 PM CDT THU JUL 8 1993

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 215 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE NORTH CENTRAL PART OF ILLINOIS
      BOONE...NORTHERN DEKALB

AT 125 PM...WE HAD RECEIVED REPORTS OF NUMEROUS FUNNEL CLOUDS
IN WESTERN DEKALB COUNTY MOVING TO THE NORTHEAST AT 40 MPH.

SOME COMMUNITIES THAT WILL BE AFFECTED BY THIS TORNADO...
KIRKLAND...BELVIDERE

IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM...TAKE COVER IN A
BASEMENT OR SMALL CENTRAL INTERIOR ROOM ON THE LOWEST FLOOR!  ABANDON
CARS...FARM MACHINERY AND MOBILE HOMES FOR A REINFORCED BUILDING...OR
A DITCH...CULVERT OR RAVINE!  THIS IS A SERIOUS SITUATION...YOUR LIFE
MAY DEPEND ON HOW QUICKLY YOU RESPOND TO THIS TORNADO WARNING!

BRONIARCZYK

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, 1:31 PM CDTTornado WarningILXBoone, DeKalb29 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.