Alert archive / Iowa / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 89, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 24, 1986, 11:42 PM CDT for Iowa County, Johnson County, Linn County, Iowa. It was in force for 33 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 24, 1986, 11:42 PM CDT (04:42 UTC)
- Expired
- Jul 25, 1986, 12:15 AM CDT
- In force
- 33 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Iowa County, IA, Johnson County, IA, Linn County, IA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 25, 12:00 AM CDT | Thunderstorm Wind 50 | Johnson, IA |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Peoria Regional, IL (KPIA), launched 00:00Z, 4.7 hours before the alert went out and 220 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
- 1392 J/kg
- Mixed-layer CIN
- -81 J/kg
- Mixed-layer LCL
- 1142 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 86 m²/s²
- 0-3 km storm-relative helicity
- 277 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 250444 SVRDSM IAC095-103-113-250515- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 1142 PM CDT THU JUL 24 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1215 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF EAST CENTRAL IOWA...IOWA...JOHNSON AND LINN AT 1140 PM CDT SURFACE REPORTS INDICATED STRONG OUTFLOW WINDS IN VINTON IOWA IN BENTON COUNTY 40 MILES NORTHWEST OF CEDAR RAPIDS. TREE DAMAGE WAS REPORTED AROUND THE CITY. THE LINE OF STORMS WAS LOCATED FROM EASTERN BENTON COUNTY TO NORTHERN IOWA COUNTY MOVING EASTERLY AT 35 TO 40 MILES AN HOUR. CITIES IN THE WARNING ARE CEDA RAPIDS..MARENGO AND IOWA CITY. REMEMBER..A SEVERE THUNDERSTORM CAN PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH..LARGE HAIL..DEADLY LIGHTNING..AND HEAVY RAINS THAT CAN QUICKLY FLOOD LOW LYING AREAS. THESE STORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING..SO BE ON THE LOOKOUT AND BE PREPARED TO MOVE TO A PLACE OF SAFETY IF ONE IS SPOTTED. FORSTER
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 24, 5:44 PM CDT, 5 hours 58 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 543 PM CDT THU JUL 24 1986 AT 535 PM CDT...STRONG THUNDERSTORMS WITH VERY HEAVY RAIN AND POSSIBLY SMALL HAIL HAD RAPIDLY DEVELOPED OVER EXTREME NORTH CENTRAL IOWA..ABOUT 15 MILES NORTH OF MASON CITY. THESE STORMS WERE PART OF A MUCH LARGER AREA OF SHOWERS AND STORMS THAT EXTENDED INTO SOUTHEAST MINNESOTA..AND NORTHEAST NEBRASKA. RAPID THUNDERSTORM ~DEVELOPEMENT IS LIKELY OVER MUCH OF NORTHWEST IOWA BY 630 PM. PEOPLE LIVNG IN NORTHWEST IOWA..SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER OVER THE NEXT TWO TO THREE HOURS. THE STORMS WERE MOVING EAST AT 40 MILES AN HOUR. BARLOW
Special weather statement, Jul 24, 8:16 PM CDT, 3 hours 26 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 815 PM CDT THU JUL 24 1986 ...SEVERE THUNDERSTORM WATCH FOR PARTS OF NORTHERN..NORTH CENTRAL AND NORTHEAST IOWA UNTIL 11 PM CDT... AT 815 PM CDT WATERLOO NATIONAL WEATHER SERVICE RADAR WAS SHOWING A LINE OF THUNDERSTORMS IN NORTH CENTRAL IOWA FROM GOLDFIELD, IOWA 25 MILES NORTHEAST OF FORT DODGE.. TO 25 MILES SOUTH OF MASON CITY. THE STRONGER THUNDERSTORMS WERE LOCATED NEAR SHEFFIELD. GENERAL THUNDERSTORMS WERE LOCATED IN NORTH CENTRAL AND PARTS OF NORTHERN IOWA. THESE THUNDERSTORMS IN NORTH CENTRAL IOWA HAVE PRODUCED PEA SIZE HAIL AT WODEN, IOWA 35 MILES WEST OF MASON CITY..FREQUENT LIGHTNING AND SOME LOCALLY HEAVY RA=IN AS THEY MOVE EAST AROUND 30 MILES AN HOUR. THE THUNDERSTORMS IN NORTH CENTRAL AND NORTHEAST IOWA HAVE NOT PRODUCED ANY SEVERE WEATHER..HOWEVER SEVERE STORMS ARE STILL POSSIBLE UNTIL 11PM. ROBB
Special weather statement, Jul 24, 8:55 PM CDT, 2 hours 47 minutes before
<PQ< SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 845 PM CDT THU JUL 24 1986 A PORTION OF THE SEVERE THUNDERSTORM WATCH FOR NORTHERN IOWA HAS BEEN CANCELLED. THE FOLLOWING COUNTIES AND CITIES ARE NOT IN THE WATCH ANY LONGER. ...NORTHWEST... BUENA VISTA CHEROKEE CLAY DICKINSON EMMET O'BRIEN OSCEOLA PALO ALTO PLYMOUTH POCHAHONTAS ...NORTH CENTRAL... KOSSUTH ...WEST CENTRAL... CALHOUN IDA MONONA SAC WOODBURY \ CITIES NOT INCLUDED IN THE WATCH AREA NY LONGER... ALGONA CHEROKEE ESTHERVILLE LE MARS SIOUX CITY SPENCER STORM LAKE lSEVERE THUNDERSTORM WATCH DOES REMAIN IN EFFECT FOR A LARGE PART OF NORTH CENTRAL AND NORTHEAST IOWA UNTIL 11 PM CDT. FORSTER
Special weather statement, Jul 24, 8:59 PM CDT, 2 hours 43 minutes before
<PQ< SPECIAL WEATHER STATEMENT...CORRECTION NATIONAL WEATHER SERVICE DES MOINES IA 845 PM CDT THU JUL 24 1986 A PORTION OF THE SEVERE THUNDERSTORM WATCH FOR NORTHERN IOWA HAS BEEN CANCELLED. THE FOLLOWING COUNTIES AND CITIES ARE NOT IN THE WATCH ANY LONGER. ...NORTHWEST... BUENA VISTA CHEROKEE CLAY DICKINSON EMMET O'BRIEN OSCEOLA PALO ALTO PLYMOUTH POCHAHONTAS ...NORTH CENTRAL... KOSSUTH ...WEST CENTRAL... CALHOUN IDA MONONA SAC WOODBURY \ CITIES NOT INCLUDED IN THE WATCH AREA NY LONGER... ALGONA CHEROKEE ESTHERVILLE LE MARS SIOUX CITY SPENCER p STORM LAKE SEVERE THUNDERSTORM WATCH DOES REMAIN IN EFFECT FOR A LARGE PART OF NORTH CENTRAL AND NORTHEAST IOWA AND ADJACENT AREAS OF MINNESOTA AND WISCONSIN UNTIL 11 PM CDT. FORSTER
Special weather statement, Jul 24, 9:56 PM CDT, 1 hour 46 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 950 PM CDT THU JUL 24 1986 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PARTS OF WEST CENTRAL INTO NORTHEASTERN IOWA TIL 11 PM... NO SEVERE WEATHER HAS BEEN REPORTED IN IOWA FROM 830 TO 945 PM. AT 930 PM... THE BAND OF INTENSE THUNDERSTORMS THAT HAS BEEN IN NORTHWESTERN IOWA THIS EVENING WAS MOVING INTO THE CENTRAL COUNTIES. THIS BAND OF STORMS STRETCHED FROM CHARLES CITY THROUGH CLARION AND JEFFERSON TO ATLANTIC. THE STRONGER STORMS WERE DUMPING TORRENTIAL RAINS..AND SOME HAIL. THEY WERE ALSO ACCOMPANIED BY WINDS UP TO 50 MILES AN HOUR. THIS BAND OF INTENSE STORMS WILL BE MOVING INTO THE WATERLOO AND DES MOINES METRO AREAS BY 11 PM. THEY WERE MOVING EAST AT 30 MILES AN HOUR. POTTS
Special weather statement, Jul 24, 11:13 PM CDT, 29 minutes before
<PQ< SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 1105 PM CDT THU JUL 24 1986 THE SEVERE THUNDERSTORM WATCH FOR MUCH OF NORTHERN IOWA HAS BEEN EXPIRED AT 1100 PM CDT. FORSTER
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 7:19 PM CDT | Severe Thunderstorm Warning | DMX | Pocahontas | 26 min |
| Jul 24, 9:55 PM CDT | Severe Thunderstorm Warning | DMX | Dallas, Guthrie | 35 min |
| Jul 24, 10:33 PM CDT | Severe Thunderstorm Warning | DMX | Polk | 27 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.