Alert archive / Illinois / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 21, NWS Quad Cities, IA

June 27, 1990Mercer County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 27, 1990, 7:49 PM CDT for Mercer County, Illinois. It was in force for 56 min. 1 report 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 27, 1990, 7:49 PM CDT (00:49 UTC)
Expired: Jun 27, 1990, 8:45 PM CDT
In force: 56 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.

What was reported inside it

Time	Report	Where	Remark
Jun 27, 7:56 PM CDT	Thunderstorm Wind 52	Mercer, 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, 0.8 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-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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1796 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 109 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 280049
SVRMLI
IAC163-ILC161-131-280145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE MOLINE IL
749 PM CDT WED JUN 27 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 845 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE EXTREME EAST PART OF IOWA
      SCOTT...

   IN THE NORTHWEST PART OF ILLINOIS
      ROCK-ISLAND...MERCER...

AT 740 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS 10 MILES
NORTHWEST OF THE QUAD CITIES MOVING SOUTHEAST AT 35 MILES AN HOUR.

DAMAGING WINDS OF 60 MILES AN HOUR AND GREATER HAVE BEEN REPORTED
WITH THESE THUNDERSTORMS.

SOME CITIES/TOWNS IN THE PATH OF THIS STORM INCLUDE... WALCOTT...
BUFFALO..QUAD CITIES...NEW BOSTON...ALEDO.

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 RELAY
YOUR REPORT OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE.

ATTN ISP 7 AND^ 1

FOBERT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 7:49 PM CDT	Severe Thunderstorm Warning	DVN	Rock Island	56 min

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.