Alert archive / Iowa / Flash Flood Warnings in 1987
Flash Flood Warning 1, NWS Quad Cities, IA
NWS Quad Cities, IA issued this flash flood warning at Aug 21, 1987, 5:53 AM CDT for Scott County, Iowa; Rock Island County, Illinois. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Aug 21, 1987, 5:53 AM CDT (10:53 UTC)
- Expired
- Aug 21, 1987, 8:35 AM CDT
- In force
- 3 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
Peoria Regional, IL (KPIA), launched 00:00Z, 10.9 hours before the alert went out and 129 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.
- Mixed-layer CAPE
- 1095 J/kg
- Mixed-layer CIN
- -45 J/kg
- Mixed-layer LCL
- 1543 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 231 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 6.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMLI 211053 FFWMLI IAC163-ILC161-211500- BULLETIN - IMMEDIATE BROADCAST REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE MOLINE IL 553 AM CDT FRI AUG 21 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 1000 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF EXTREME EAST IOWA...SCOTT NORTHWEST ILLINOIS...ROCK-ISLAND AT 540 AM CDT FLOODING WAS REPORTED IN THE QUAD CITY METRO AREA. SOME STREETS WERE UNDER 2 TO 4 FEET OF WATER IN DAVENPORT IA AND IN EAST MOLINE IL. HEAVY RAINFALL WILL CONTINUE TILL 630 AM CDT...CAUSING FURTHER RISES ON SMALL STREAMS AND URBAN FLOODING. 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. DO NOT TRY TO DRIVE THROUGH FLOODED AREAS...ESPECIALLY FLOWING WATER. 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
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 12:32 AM CDT | Severe Thunderstorm Warning | DVN | Jones | 43 min |
| Aug 21, 12:39 AM CDT | Severe Thunderstorm Warning | DVN | Cedar | 21 min |
| Aug 21, 1:02 AM CDT | Severe Thunderstorm Warning | DVN | Cedar, Muscatine | 38 min |
| Aug 21, 1:49 AM CDT | Severe Thunderstorm Warning | DVN | Scott | 26 min |
| Aug 21, 2:18 AM CDT | Severe Thunderstorm Warning | DVN | Scott | 42 min |
| Aug 21, 3:31 AM CDT | Severe Thunderstorm Warning | DVN | Scott | 29 min |
| Aug 21, 4:01 AM CDT | Severe Thunderstorm Warning | DVN | Scott | 59 min |
| Aug 21, 4:57 AM CDT | Severe Thunderstorm Warning | DVN | Cedar, Clinton, Scott | 33 min |
| Aug 21, 5:28 AM CDT | Severe Thunderstorm Warning | DVN | Scott | 47 min |
| Aug 21, 2:18 AM CDT | Severe Thunderstorm Warning | DVN | Henry, Mercer, Rock Island | 42 min |
| Aug 21, 4:01 AM CDT | Severe Thunderstorm Warning | DVN | Mercer | 59 min |
| Aug 21, 4:57 AM CDT | Severe Thunderstorm Warning | DVN | Henry | 33 min |
Nearby
Flash Flood Warnings in Iowa, 1987Flash Flood Warnings in Illinois, 1987Every flash flood warning in 1987
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.