Alert archive / Illinois / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 63, NWS Lincoln, IL

June 29, 1990DeKalb County, Lee County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jun 29, 1990, 2:22 AM CDT for DeKalb County, Lee County, Illinois. It was in force for 53 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 29, 1990, 2:22 AM CDT (07:22 UTC)
Expired: Jun 29, 1990, 3:15 AM CDT
In force: 53 min
Issued by: NWS Lincoln, IL
Area: Whole counties

Counties DeKalb County, IL, Lee County, IL

The radar

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

What was reported inside it

Time	Report	Where	Remark
Jun 29, 2:45 AM CDT	Thunderstorm Wind 0	Lee, IL
Jun 29, 3:00 AM CDT	Thunderstorm Wind 0	De Kalb, IL

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 7.4 hours before the alert went out and 305 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 840 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 630 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 152 m²/s²
0-3 km storm-relative helicity: 245 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 5.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KRFD 290722
SVRRFD
ILC103-037-290815-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE ROCKFORD IL
222 AM CDT FRI JUN 29 1990

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

   IN THE NORTH CENTRAL PART OF ILLINOIS
      LEE...SOUTHERN DEKALB

AT 2 19 AM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS
ACORSS NORTHERN LEE AND CENTRAL DEKALB COUNTIES. TREE AND POWER
LINE DAMAGE WAS REPORTED ACROSS THE EASTERN HALF OF OGLE COUNTY
WITH THESE STORMS. THE STORMS WERE MOVING TO THE SOUTH AT 35
MPH.

SOME COMMUNITIES THAT WILL BE AFFECTED BY THIS SEVERE THUNDERSTORM...
DIXOM...COMPTON...HINKLEY AND SANDWICH.

IF YOU ARE IN AN AREA THREATENED BY THE STORM...GO TO A REINFORECED
SHELTER.  SEVERE THUNDERSTORMS CAN PRODUCE WINDS OF 60 MPH OR
GREATER...LARGE HAIL...DANGEROUS LIGHTNING AND HEAVY RAIN THAT
CAN QUICKLY FLOOD A LOW LYING AREA.

REMEMBER...SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING...SO BE ALERT!

ATTN: ISP DIST  1..2.                                   SANDERS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 12:46 AM CDT	Severe Thunderstorm Warning	ILX	Stephenson, Winnebago	44 min
Jun 29, 1:08 AM CDT	Severe Thunderstorm Warning	ILX	Boone	67 min
Jun 29, 1:39 AM CDT	Severe Thunderstorm Warning	ILX	DeKalb, Ogle, Winnebago	51 min
Jun 29, 2:00 AM CDT	Severe Thunderstorm Warning	ILX	Carroll, Ogle	45 min
Jun 29, 2:51 AM CDT	Severe Thunderstorm Warning	ILX	Bureau, Putnam	69 min
Jun 29, 7:15 AM CDT	Flash Flood Warning	ILX	McLean, Peoria, Tazewell, Woodford	2 hr
Jun 29, 9:20 AM CDT	Flash Flood Warning	ILX	McLean, Peoria, Tazewell, Woodford	115 min
Jun 29, 11:15 AM CDT	Flash Flood Warning	ILX	McLean, Peoria, Tazewell, Woodford	3 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 1990 Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.