Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 22, NWS Quad Cities, IA

June 29, 1990Lafayette County, Wisconsin

NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 29, 1990, 12:38 AM CDT for Lafayette County, Wisconsin. It was in force for 52 min.

The area

The counties it named.

The facts

Issued: Jun 29, 1990, 12:38 AM CDT (05:38 UTC)
Expired: Jun 29, 1990, 1:30 AM CDT
In force: 52 min
Issued by: NWS Quad Cities, IA
Area: Whole counties

County Lafayette County, WI

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, 5.6 hours before the alert went out and 260 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 KMSN 290538
SVRDBQ
WIC065-290630-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DUBUQUE IA
ISSUED BY MADISON WI
1238 AM CDT FRI JUN 29 1990
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  130 AM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTHWEST WISCONSIN
          ...LA FAYETTE
 
 
 
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE H`AIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

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, Jun 28, 7:21 PM CDT, 5 hours 17 minutes before

ILZ004-IAZ015-290130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOLINE IL
720 PM CDT THU JUN 28 1990

...SEVERE THUNDERSTORM WATCH CNACELLED FOR THE QUAD CITIES AND
SURROUNDING AREA...

AT 715 PM CDT ALL SHOWERS AND THUNDERSTORMS WERE WELL SOUTHEAST OF
THE QUAD CITIES AND SURROUNDING COUNTIES.  THE FOLLOWING COUNTIES ARE
NO LONGER IN A SEVERE THUNDERSTORM WATCH...MERCER...ROCK ISLAND...
HENRY...AND WHITESIDE...ALL IN EXTREME NORTHWEST ILLINOIS.

OTHER PARTS OF NORTHWEST AND NORTH CENTRAL ILLINOIS REMAIN IN A
SEVERE THUNDERSTORM WATCH UNTIL 10 PM CDT.

DUE TO A LIGHTNING STRIKE AT THE MOLINE NATIONAL WEATHER SERVICE OFFICE
...THIS STATEMENT IS RUNNING A LITTLE LATE.  WE HOPE THIS HAS NOT
CAUSED ANY CONFUSION THIS EVENING.
MEYER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 5:23 AM CDT	Flash Flood Warning	DVN	Grant, Lafayette	2 hr

Nearby

Severe Thunderstorm Warnings in Wisconsin, 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; the sounding from the Mesonet's radiosonde archive.