Alert archive / Illinois / Flash Flood Warnings in 1990

Flash Flood Warning 21, NWS Quad Cities, IA

June 29, 1990Henry County, Rock Island County, Whiteside County, Illinois; Clinton County, Iowa

NWS Quad Cities, IA issued this flash flood warning at Jun 29, 1990, 11:02 AM CDT for Henry County, Rock Island County, Whiteside County, Illinois; Clinton County, Iowa. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jun 29, 1990, 11:02 AM CDT (16:02 UTC)
Expired
Jun 29, 1990, 2:00 PM CDT
In force
3 hr
Issued by
NWS Quad Cities, IA
Area
Whole counties

Counties Clinton County, IA, Henry County, IL, Rock Island County, IL, Whiteside 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 12:00Z, 4.0 hours before the alert went out and 364 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 12:00Z on 1990-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 249 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 1990-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 97 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
249 J/kg
Mixed-layer CIN
-194 J/kg
Mixed-layer LCL
597 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
97 m²/s²
0-3 km storm-relative helicity
159 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KMLI 291602
FFWMLI
IAC163-045-ILC161-073-195-291900-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
FLASH FLOOD WARNING 
NATIONAL WEATHER SERVICE MOLINE IL
1102 AM CDT FRI JUN 29 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING 
EFFECTIVE UNTIL 200 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE EXTREME EAST PART OF IOWA
      SCOTT...CLINTON...

   IN THE NORTHWEST PART OF ILLINOIS
      ROCK-ISLAND...HENRY...WHITESIDE...

AT  11 AM CDT THUNDERSTORMS CONTINUE OVER EXTREME EASTERN IA AND
NORTHWEST ILLINOIS.  ADDITIONAL RAINFALLS OF 1 TO 2 INCHES HAVE
FALLEN AT MID MORNING WITH MOST STREAMS AND CREEKS OUT OF THEIR
BANKS AND MANY RURAL ROADS CLOSED.

AT 11 AM DUCK CREEK HAS CRESTED AT DIVISION STREET IN DAVENPORT
BUT STILL RISING DOWN STREAM.

FLASH FLOOD WARNING MEANS FLASH FLOODING IS OCCURRING OR IS
IMMINENT IN THE SPECIFIED AREA.

PERSONS ALONG OR NEAR STREAMS SUBJECT TO FLASH FLOODING OR SHARP
RISES SHOULD BE PREPARED TO MOVE TO A PLACE OF SAFETY IMMEDIATELY.

MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.  DO NOT ATTEMPT TO
CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS THE ROADWAY.
NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SM*ALL ONE...ON FOOT.

IF TIME PERMITS...ASK THE NEAREST LAW ENFORECMENT AGENCY TO RELAY
YOUR REPORT OF FLOODING TO THE NATIONAL WEATHER SERVICE.

ATTN ISP 7 AND 1

KRAEMER/MYER

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, 3:04 AM CDTSevere Thunderstorm WarningDVNHenry41 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, 8:03 AM CDTFlash Flood WarningDVNClinton, Scott3 hr
Jun 29, 11:02 AM CDTFlash Flood WarningDVNScott3 hr

Nearby

Flash Flood Warnings in Illinois, 1990Flash Flood Warnings in Iowa, 1990Every flash flood 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.