Alert archive / Illinois / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 24, NWS Quad Cities, IA

June 29, 1990Henry County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 29, 1990, 3:04 AM CDT for Henry County, Illinois. It was in force for 41 min.

The area

The counties it named.

The facts

Issued
Jun 29, 1990, 3:04 AM CDT (08:04 UTC)
Expired
Jun 29, 1990, 3:45 AM CDT
In force
41 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Henry County, IL

The radar

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

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 8.1 hours before the alert went out and 385 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 1990-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 840 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 00:00Z on 1990-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 152 square meters per square second.193958Sfc1 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
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 KMLI 290804
SVRMLI
ILC073-290845-

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

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 345 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY

   IN THE NORTHWEST PART OF ILLINOIS
      HENRY

AT 254 AM CDT WIND DAMAGE WAS REPORTED AROUND GENESEO AND ATKINSON
...25 MILES EAST OF MOLINE IN NORTHWEST ILLINOIS.  THE STORM WAS
MOVING EAST AT 35 MPH.

SOME CITIES/TOWNS IN THE PATH OF THIS STORM INCLUDE... GENESEO,
ATKINSON, KEWANEE, ILLINOIS.

FOR YOUR PROTECTION GO TO A SAFE PLACE IMMEDIATELY.  STAY INDOORS
AND AVOID WINDOWS.  IF OUTDOORS...DO NOT STAND UNDER A TREE OR IN
OPEN AREAS SUCH AS A FIELD.

A SEVERE THUNDERSTORM CAN PRODUCE DAMAGING WIND OF 60 MPH OR MORE...
LARGE HAIL...FREQUENT DANGEROUS LIGHTNING AND HEAVY RAIN.

IF TIME PERMITS...ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAMY
YOUR REPORT OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE.

ATTN ISP 7 AND 1

COOPER/FOBERT

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 29, 1:31 AM CDTSevere Thunderstorm WarningDVNJo Daviess, Stephenson59 min
Jun 29, 3:30 AM CDTSevere Thunderstorm WarningDVNHenry, Rock Island30 min
Jun 29, 4:23 AM CDTFlash Flood WarningDVNRock Island4 hr
Jun 29, 4:23 AM CDTFlash Flood WarningDVNHenry4 hr
Jun 29, 8:03 AM CDTFlash Flood WarningDVNHenry, Rock Island, Whiteside3 hr
Jun 29, 11:02 AM CDTFlash Flood WarningDVNHenry, Rock Island, Whiteside3 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 1990Every 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; the sounding from the Mesonet's radiosonde archive.