Alert archive / Illinois / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 23, NWS Quad Cities, IA

June 29, 1990Jo Daviess County, Stephenson County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 29, 1990, 1:31 AM CDT for Jo Daviess County, Stephenson County, Illinois. It was in force for 59 min. 3 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, 1:31 AM CDT (06:31 UTC)
Expired: Jun 29, 1990, 2:30 AM CDT
In force: 59 min
Issued by: NWS Quad Cities, IA
Area: Whole counties

Counties Jo Daviess County, IL, Stephenson 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
Jun 29, 2:20 AM CDT	Thunderstorm Wind 0	Jo Daviess, IL
Jun 29, 2:20 AM CDT	Thunderstorm Wind 0	Jo Daviess, IL
Jun 29, 2:25 AM CDT	Thunderstorm Wind 0	Stephenson, 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, 6.5 hours before the alert went out and 279 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 290631
SVRRFD
ILC177-085-290730-

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

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 230 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE NORTH CENTRAL PART OF ILLINOIS
      WESTERN STEPHENSON...

   IN THE NORTHWEST PART OF ILLINOIS
      JO DAVIESS...

AT 1 25 AM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A LINE
OF POSSIBLE SEVERE THUNDERSTORMS DEVELOPING IN SOUTHWESTERN
WISCONSIN...ACROSS THE SOUTHERN HALF OF LAFAYETTE COUNTY...ABOUT
50 TO 75 MILES NORTHWEST OF ROCKFORD. THE STORMS WERE MOVING TO THE
SOUTH-SOUTHEAST AT 35 TO 40 MPH.

SOME COMMUNITIES THAT WILL BE AFFECTED BY THIS SEVERE THUNDERSTORM...
STOCKTON...ELIZABETH...LENA...PEARL CITY.

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  16                                      SANDERS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 3:04 AM CDT	Severe Thunderstorm Warning	DVN	Henry	41 min
Jun 29, 3:30 AM CDT	Severe Thunderstorm Warning	DVN	Henry, Rock Island	30 min
Jun 29, 4:23 AM CDT	Flash Flood Warning	DVN	Rock Island	4 hr
Jun 29, 4:23 AM CDT	Flash Flood Warning	DVN	Henry	4 hr
Jun 29, 8:03 AM CDT	Flash Flood Warning	DVN	Henry, Rock Island, Whiteside	3 hr
Jun 29, 11:02 AM CDT	Flash Flood Warning	DVN	Henry, Rock Island, Whiteside	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.