Alert archive / Illinois / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 33, NWS Quad Cities, IA

July 9, 1990Mercer County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 9, 1990, 9:58 PM CDT for Mercer County, Illinois. It was in force for 32 min.

The area

The counties it named.

The facts

Issued
Jul 9, 1990, 9:58 PM CDT (02:58 UTC)
Expired
Jul 9, 1990, 10:30 PM CDT
In force
32 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Mercer 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, 3.0 hours before the alert went out and 423 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 1990-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1990-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 11 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1577 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
11 m²/s²
0-3 km storm-relative helicity
59 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 KMLI 100258
SVRMLI
ILC131-100345-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE MOLINE IL
958 PM CDT MON JUL 9 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 1045 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY

   IN THE NORTHWEST PART OF ILLINOIS
      MERCER

AT 10 50 PM CDT A LINE OF SEVERE THUNDERSTORMS WAS MOVING INTO WEST
MERCER COUNTY OF NORTHWEST ILLINOIS...EXTENDING FROM 20 MILES
SOUTHWEST OF THE QUAD CITIES TO NEAR KEITHSBURG ILLINOIS WHICH IS
30 MILES SOUTHWEST OF THE QUAD CITIES.  60 MPH WINDS HAVE BEEN
REPORTED WITH THESE SEVERE THUNDERSTORMS.

SOME CITIES/TOWNS IN THE PATH OF THIS STORM INCLUDE... ALEDO...
KEITHSBURG...MATHERVILLE AND VIOLA.

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.

IF TIME PERMITS...ASK THE NEAREST LAW E)NFORCEMENT AGENCY TO RELAY
YOUR REPORT OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE.

ATTN ISP 7 AND 1

MEYER 0257Z

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 9, 7:50 PM CDT, 2 hours 8 minutes before
ILZ004-IAZ015-100130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOLINE IL
745 PM CDT MON JUL 9 1990

A LINE OF SHOWERS AND THUNDERSTORMS IS DEVELOPING ACROSS SOUTHERN IOWA
INTO CENTRAL ILLINOIS THIS EVENING.   STORMS EXTEND ACROSS HENRY, LEE,
AND DES MOINES COUNTIES OF IOWA, INTO SOUTHERN MERCER, HENDERSON,
AND WARREN COUNTIES OF ILLINOIS.

THESE THUNDERSTORMS WILL PRODUCE BRIEF PERIODS OF HEAVY RAIN.  THEY ARE
MOVING TO THE EAST-NORTHEA]ST AT 20 MPH

STRONGER STORMS HAVE DEVELOPED IN SOUTHCENTRAL IOWA AND ARE EXPECTED TO
MOVE INTO SOUTHEASTERN PORTIONS OF IOWA LATER ON THIS EVENING.

COOPER
Special weather statement, Jul 9, 9:03 PM CDT, 55 minutes before
ILZ004-IAZ015-100300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOLINE IL
900 PM CDT MON JUL 9 1990

...SEVERE THUNDERSTORM WATCH IN EFFECT TONIGHT AND UNTIL 300 AM
CDT TUESDAY MORNING...

STRONG THUNDERSTORMS WERE ROLLING ACROSS SOUTHEAST IOWA TONIGHT.

AT 900 PM CDT STRONG THUNDERSTORMS WERE 5 MILES SOUTHWEST OF MT.
PLEASANT IOWA IN CENTRAL HENRY COUNTY OF SOUTHEAST IOWA.  THIS WOULD
PLACE THE STRONG THUNDERSTORMS 20 MILES WEST OF BURLINGTON IOWA.

OTHER STRONG THUNDERSTORMS WERE SCATTERED ACROSS LEE AND LOUISA
COUNTIES OF SOUTHEAST IOWA.  ALL THUNDERSTORMS WERE MOVING NORTHEAST AT
30 MILES AN HOUR.

AT 845 PM CDT...SALEM IOWA IN SOUTH CENTRAL HENRY COUNTY REPORTED 40
MPH WINDS AND HEAVY RAIN.

IF YOU LIVE IN SOUTHEAST IOWA...BE ON THE LOOKOUT FOR RAPIDLY CHANGING
WEATHER CONDITIONS.  BE PREPARED TO MOVE TO A SAFE LOCATION IN CASE OF
THREATENING WEATHER.

MEYER

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.