Alert archive / Iowa / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 9, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 8, 1986, 9:20 PM CDT for Muscatine County, Scott County, Iowa; Rock Island County, Illinois. It was in force for 40 min.
The area
The counties it named.
The facts
- Issued
- Jul 8, 1986, 9:20 PM CDT (02:20 UTC)
- Expired
- Jul 8, 1986, 10:00 PM CDT
- In force
- 40 min
- Issued by
- NWS Quad Cities, IA
- Area
- Whole counties
Counties Muscatine County, IA, 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, 2.3 hours before the alert went out and 137 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 090220 SVRMLI IAC163-139-ILC161-090300- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOLINE IL 920 PM CDT TUE JUL 8 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1000 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF EXTREME EAST IOWA...SOUTHERN SCOTT AND MUSCATINE NORTHWEST ILLINOIS...SOUTHERN ROCK-ISLAND AT 915 PM CDT RADAR SHOWED SEVERE THUNDERSTORMS IN NORTHWEST AND NORTHEAST MUSCATINE COUNTY MOVING SOUTHEAST AT 25 MPH. SEVERE THUNDERSTORMS CAN PRODUCE ANY OR ALL OF THE FOLLOWING: DAMAGING WINDS OF 58 MPH OR MORE..HAIL 3/4 INCH IN DIAMETER OR LARGER. TORRENTIAL DOWNPOURS CAPABLE OF PRODUCING LOWLAND AND URBAN FLOODING MAY ALSO ACCOMPANY THIS STORM. IF THREATENING WEATHER APPROACHES..YOU SHOULD GO TO A SAFE PLACE. ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR REPORT OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE. BOoBLETT
What forecasters said that day
The local office's own words before this severe thunderstorm 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 35 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, 3 hours 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, 1 hour 26 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, 1 hour 13 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
Special weather statement, Jul 8, 9:00 PM CDT, 20 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MOLINE IL 900 PM CDT TUE JUL 8 1986 ...STRONG THUNDERSTORMS AND HEAVY RAIN MOVING TOWARD THE QUAD CITIES... AT 855 PM CDT..RADAR SHOWED A 20 MILE WIDE LINE OF STRONG THUNDERSTORMS OVER EASTERN IOWA AND NORTHWESTERN ILLINOIS. IT EXTENDED FROM IOWA CITY TO JUST NORTH OF THE QUAD CITIES TO LA SALLE/PERU ILLINOIS. THE LINE WAS MOVING TO THE SOUTHEAST ABOUT 25 MPH AND WAS ROUGHLY ALONG I-80. TiHESE STORMS ARE LIKLEY TO BE ACCOMPANIED BY HEAVY DOWNPOURS.. STRONG WINDS..HAIL AND FREQUENT DANGEROUS LIGHTNING. WIGGINS
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 7:35 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Scott | 25 min |
| Jul 8, 8:51 PM CDT | Flash Flood Warning | DVN | Cedar, Clinton, Scott | 3 hr |
| 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, 8:51 PM CDT | Flash Flood Warning | DVN | Rock Island, Whiteside | 3 hr |
Nearby
Severe Thunderstorm Warnings in Iowa, 1986Severe Thunderstorm Warnings in Illinois, 1986Every severe thunderstorm 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.