Alert archive / Iowa / Flash Flood Warnings in 1990

Flash Flood Warning 16, NWS Quad Cities, IA

June 29, 1990Scott County, Iowa; Rock Island County, Illinois

NWS Quad Cities, IA issued this flash flood warning at Jun 29, 1990, 4:23 AM CDT for Scott County, Iowa; Rock Island County, Illinois. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Jun 29, 1990, 4:23 AM CDT (09:23 UTC)
Expired
Jun 29, 1990, 8:00 AM CDT
In force
4 hr
Issued by
NWS Quad Cities, IA
Area
Whole counties

Counties Scott County, IA, Rock Island 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, 9.4 hours before the alert went out and 384 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 1990-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 840 joules per kilogram.LCLLFCEL10008507005003002001001 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 1990-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 152 square meters per square second.193958Sfc1 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
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 KMLI 290928 COR
FFWMLI
IAC163-ILC161-073-291700-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTION FOR TIME
NATIONAL WEATHER SERVICE MOLINE IL
423 AM CDT FRI JUN 29 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 800 AM CDT FOR PEOPLE IN THE FOLLOWING
COUNTIES

   IN THE EXTREME EAST PART OF IOWA
      SCOTT...

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

AT 4AM...A NARROW LINE OF STRONG THUNDERSTORMS WITH HEAVY RAIN
EXTENDED FROM EAST CENTRAL IOWA INTO NORTHWEST ILLINOIS.
THUNDERSTORMS WERE LOCATED FROM SOUTHEAST CEDAR ACROSS SOUTH
SCOTT IN EAST CENTRAL IOWA INTO UPPER ROCK ISLAND AND NORTH HENRY
COUNTIES IN NORTHWEST ILLINOIS.

ESTIMATED RAINFALL OF UP TO 3 AND A HALF INCHES HAS OCCURRED SO
FAR AND ADDITIONAL THUNDERSTORMS WILL MOVE OVER THE SAME GENERAL
AREA.

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 SMALL 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

COOPER/FOBERT

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 8:03 AM CDTFlash Flood WarningDVNClinton, Scott3 hr
Jun 29, 11:02 AM CDTFlash Flood WarningDVNClinton3 hr
Jun 29, 11:02 AM CDTFlash Flood WarningDVNScott3 hr
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 WarningDVNHenry4 hr
Jun 29, 8:03 AM CDTFlash Flood WarningDVNHenry, Rock Island, Whiteside3 hr

Nearby

Flash Flood Warnings in Iowa, 1990Flash Flood Warnings in Illinois, 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.