Alert archive / Illinois / Flash Flood Warnings in 1986
Flash Flood Warning 4, NWS Quad Cities, IA
NWS Quad Cities, IA issued this flash flood warning at Jul 8, 1986, 8:51 PM CDT for Rock Island County, Whiteside County, Illinois. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Jul 8, 1986, 8:51 PM CDT (01:51 UTC)
- Expired
- Jul 9, 1986, 12:00 AM CDT
- In force
- 3 hr
- Issued by
- NWS Quad Cities, IA
- Area
- Whole counties
Counties 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
Peoria Regional, IL (KPIA), launched 00:00Z, 1.9 hours before the alert went out and 118 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
- 1445 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 1379 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 129 m²/s²
- 0-3 km storm-relative helicity
- 208 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 7.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMLI 090151 FFWMLI IAC163-045-031-ILC161-195-090500- BULLETIN - IMMEDIATE BROADCAST REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE MOLINE IL 851 PM CDT TUE JUL 8 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 1200 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF EXTREME EAST IOWA...SCOTT...CLINTON AND CEDAR NORTHWEST ILLINOIS...NORTHERN ROCK-ISLAND AND WHITESIDE A CONTINUING OUTBREAK OF STRONG THUNDERSTORMS HAS PRODUCED RAINFALL AMOUNTS OF MORE THAN TWO INCHES IN A SHORT TIME OVER PARTS OF THESE COUNTIES. MANY PLACES WERE STILL RAINING AND MORE IS EXPECTED. THERE HAVE BEEN NUMEROUS REPORTS OF SMALL STREAMS OUT OF THEIR BANKS IN THOSE COUNTIES. FLASH FLOOD WARNING MEANS FLASH FLOODING IS OCCURRING OR IS IMMINENT IN THE SPECIFIED AREA. DO NOT TRY TO DRIVE THROUGH FLOODED AREAS. PERSONS ALONG OR NEAR STREAMS SUBJECT TO FLASH FLOODING SHOULD BE PREPARED TO MOVE TO A PLACE OF SAFETY IM`MEDIATELY. WIGGINS
What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Jul 8, 5:45 PM CDT, 3 hours 6 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DUBUQUE IA 545 PM CDT TUE JUL 8 1986 ...INTENSE THUNDERSTORMS MOVING THROUGH JONES COUNTY IN EASTCENTRAL IOWA... AT 540 PM THUNDERSTORMS CONTINUED TO STRENGTHEN AS THEY MOVED EAST THOUGH JONES COUNTY IN NORTHEAST IOWA. LOCATION OF THE STRONGEST STORMS WERE IN THE SOUTHERN PART OF JONES COUNTY..10 MILES SOUTH AND EAST OF ANAMOSA..45 MILES SOUTHWEST OF DUBUQUE. MOVEMENT WAS EAST AT 30 MILES AN HOUR. THESE STORMS MAY PRODUCE STRONG WIND..HEAVY RAIN AND POSSIBLE PEA TO MARBLE SIZE HAIL AS THEY MOVE THROUGH. PERSONS IN JONES COUNTY SHOULD BE ALERT FOR THESE INTENSE STORMS AND IF THREATENING WEATHER IS SIGHTED..TAKE COVER IMMEDIOATELY. KOWALSKI
Special weather statement, Jul 8, 6:20 PM CDT, 2 hours 31 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MOLINE IL 620 PM CDT TUE JUL 8 1986 ...HEAVY RAINFALL AND STRONG THUNDERSTORMS MOVING ACROSS EASTERN IOWA AND INTO NORTHWESTERN ILLINOIS... AT 615 PM..RADAR SHOWED A 25 MILE WIDE BAND OF SHOWERS AND STRONG THUNDERSTORMS EXTENDING FROM NORTH OF CEDAR RAPIDS TO NORTH OF OF CLINTON..BOTH IN IOWA TO SOUTH OF STERLING ILLINOIS. SOME OF THESE STORMS ARE CHARACTERIZED BY VERY HEAVY DOWNPOURS.. SMALL HAIL AND STRONG WINDS. THIS COUPLED WITH THE SLOW MOVEMENT OF THE STORMS WILL CAUSE SOME SMALL STREAM AND URBAN FLOODING IN SOUTHERN CEDAR..NORTHERN CLINTON AND SOUTHERN JACKSON COUNTIES IN EASTERN IOWA AND SOUTHERN WHITESIDE COUNTY IN NORTHWESTERN ILLINOIS. PERSONS ALONG STREAMS SUBJECT TO RAPID RISES SHOULD BE PREPARED TO MOVE TO HIGHER GROUND./WIGGINS
Special weather statement, Jul 8, 7:54 PM CDT, 57 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MOLINE IL 755 PM CDT TUE JUL 8 1986 AT 750 PM..RADAR SHOWED A CLUSTER OF STRONG THUNDERSTORMS ALONG THE WAPSI RIVER BETWEEN CLINTON AND SCOTT COUNTIES IN EASTERN IOWA. THERE HAVE BEEN NUMEROUS REPORTS OF STRONG WINDS RESULTING IN SOME TREES AND POWER LINES DOWN. HEAVY DOWNPOURS WERE ALSO OCCURRING AND PRODUCING SMALL STREAM..LOWLAND AND URBAN FLOODING. PERSONS ALONG STREAMS SUBJECT TO RAPID; RISES SHOULD BE PREPARED TO MOVE TO A SAFE PLACE. WIGGINS
Special weather statement, Jul 8, 8:07 PM CDT, 44 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DUBUQUE IA 805 PM CDT TUE JUL 8 1986 ...HEAVY THUNDERSTORMS MOVING ACROSS EASTERN IOWA... AT 800 PM HEAVY THUNDERSTORMS WERE MOVING ACROSS SOUTHERN PORTIONS OF JONES AND JACKSON COUNTIES OF EASTCENTRAL IOWA. THE STRONGEST OF THESE STORMS WERE ALONG AN EAST - WEST LINE FROM 30 MILES SOUTHWEST OF DUBUQUE TO 35 MILES SOUTHEAST OF DUBUQUE. OTHER HEAVY THUNDER- STORMS WILL BE MOVNING ACROSS SOUTHERN PORTIONS OF DUBUQUE COUNTY. THESE STORMS HAVE PRODUCED IN EXCESS OF TWO INCHES OF RAIN IN A 2 HOUR PERIOD. SMALL STREAM AND ROADWAY FLOODING CAN BE EXPECTED AS THESE STORMS MOVE TO THE SOUTHEAST AT 35 MILES AND HOUR. PERSONS IN JONES AND JACKSON AND DUBUQUE COUNTIES OF EASTERN IOWA SHOULD BE ALERT FOR THESE INTENSE STORMS AND IF THREATENING WEATHER IS SIGHTED..TAKE COVER IMMEDIATELY. ASMUS
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 7:10 PM CDT | Severe Thunderstorm Warning | DVN | Whiteside | 20 min |
| Jul 8, 8:29 PM CDT | Severe Thunderstorm Warning | DVN | Whiteside | 31 min |
| Jul 8, 9:20 PM CDT | Severe Thunderstorm Warning | DVN | Rock Island | 40 min |
Nearby
Flash Flood Warnings in Illinois, 1986Every flash flood warning in 1986
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.