Alert archive / Illinois / Tornado Warnings in 1993

Tornado Warning 2, NWS Lincoln, IL

May 23, 1993Boone County, DeKalb County, Illinois

NWS Lincoln, IL issued this tornado warning at May 23, 1993, 7:46 PM CDT for Boone County, DeKalb County, Illinois. It was in force for 44 min.

The area

The counties it named.

The facts

Issued
May 23, 1993, 7:46 PM CDT (00:46 UTC)
Expired
May 23, 1993, 8:30 PM CDT
In force
44 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 00:00Z, 0.8 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 00:00Z on 1993-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 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 00:00Z on 1993-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 square meters per square second.193958Sfc1 km3 km6 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
538 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
66 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 240046
TORRFD
ILC007-037-240130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING 
NATIONAL WEATHER SERVICE ROCKFORD IL
746 PM CDT SUN MAY 23 1993

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 830 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

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

AT 735 PM CDT OGLE COUNTY SHERIFFS OFFICE REPORTED A TORNADO JUST
SOUTH OF DAVIS JUNCTION...OR ABOUT 15 MILES SOUTH OF ROCKFORD. THE
STORM WAS MOVING TO THE EAST AROUND 40 MPH.

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

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

PETROVICH

The office that day

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

IssuedProductOfficeCountiesLasted
May 23, 7:26 PM CDTSevere Thunderstorm WarningILXOgle, Winnebago49 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.