Alert archive / Iowa / Tornado Warnings in 1986
Tornado Warning 12, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Jul 8, 1986, 9:05 PM CDT for Poweshiek County, Iowa. It was in force for 25 min.
The area
The counties it named.
The facts
- Issued
- Jul 8, 1986, 9:05 PM CDT (02:05 UTC)
- Expired
- Jul 8, 1986, 9:30 PM CDT
- In force
- 25 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Poweshiek County, IA
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, 2.1 hours before the alert went out and 270 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 KDSM 090207 TORDSM IAC157-090230- BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DES MOINES IA 905 PM CDT TUE JUL 8 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 930 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF CENTRAL IOWA...SOUTHEAST POWESHIEK A FUNNEL CLOUD WAS REPORTED AT 900 PM ON COUNTY ROAD V18 AT THE THE NORTH ENGLISH RIVER..ABOUT 5 MILES SOUTH OF BROOKLYN. BROOKLYN IS ABOUT 35 MILE WEST OF IOWA CITY. RADAR INDICATED A STRONG THUNDERSTORM IN THE AREA MOVING TO THE SOUTHEAST AT 30 MILES AN HOUR. IF A TORNADO APPROACHES..SEEK SHELTER IMMEDIATELY. DOWD/MS
What forecasters said that day
The local office's own words before this tornado 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, 3:41 PM CDT, 5 hours 24 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 339 PM CDT TUE JUL 8 1986 A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PARTS OF NORTHWEST AND NORTH CENTRAL IOWA UNTIL 7PM THIS EVENING. NO SEVERE WEATHER WAS REPORTED IN IOWA BETWEEN 235 AND 335 PM CDT. AT 331 PM CDT... SCATTERED SHOWERS AND THUNDERSTORMS WERE LOCATED OVER EXTREME NORTHWEST IOWA. THEY WERE GENERALLY BETWEEN SIOUX CITY AND THE SPENCER AREA. A VERY STRONG STORM WAS LOCATED OVER NORTHEAST NEBRASKA. THIS STORM WILL MOVE INTO THE ONAWA AREA OF WEST CENTRAL IOWA BY 400 PM. THE SHOWERS AND STORMS WERE MOVING SOUTHEAST AT 30 MILES AN HOUR. SCHUMACHER
Special weather statement, Jul 8, 4:42 PM CDT, 4 hours 23 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 438 PM CDT TUE JUL 8 1986 A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PARTS OF NORTHWEST AND NORTH CENTRAL IOWA UNTIL 7PM THIS EVENING. NO SEVERE WEATHER WAS REPORTED IN IOWA BETWEEN 335 AND 435 PM CDT. AT 434 PM CDT... VERY STRONG THUNDERSTORMS WERE OCCURRING OVER NORTH CENTRAL..NORTHWEST AND PARTS OF WEST CENTRAL IOWA. THE STRONGEST STORMS WERE IN A 20 MILE WIDE AREA EXTENDING FROM 30 MILES SOUTHEAST OF SIOUX CITY..TO NEAR SPENCER..THEN EAST TO JUST NORTH OF MASON CITY. THESE STORMS WILL PRODUCE VERY HEAVY RAIN..GUSTY WINDS AND POSSIBLY SOME SMALL HAIL. ELSEWHERE..A FEW THUNDERSHOWERS HAD DEVELOPED OVER EAST CENTRAL IOWA. THEY WERE IN AND JUST NORTH OF CEDAR RAPIDS. THE STORMS WERE ALL MOVING EAST AT 30 MILES AN HOUR. BOTH AREAL COVERAGE AND INTENSITY WERE INCREASING. SCHUMACHER
Special weather statement, Jul 8, 8:58 PM CDT, 7 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 855 PM CDT TUE JUL 8 1986 A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR THE SOUTHERN TWO-THIRDS OF IOWA UNTIL 12 MIDNIGHT. NO SEVERE WEATHER WAS REPORTED IN IOWA BETWEEN 730 PM AND 845 PM THIS EVENING. AT 850 PM CDT... THE HEAVIEST STORMS WERE IN EASTERN IOWA..IN A NARROW LINE FROM 40 MILES EAST OF DES MOINES TO NEAR THE QUAD CITIES. THESE STORMS WERE MOVING SOUTHEAST AT 30 MILES AN HOUR. IN WEST CENTRAL IOWA..THE STORMS WERE IN A LINE THAT STRETCHED FROM JUST SOUTHWEST OF DES MOINES TO JUST SOUTH OF COUNCIL BLUFFS. THESE STORMS WERE ALSO MOVING SOUTHEAST AT 30 MILES AN HOUR. IN ADDITION..SCATTERED SHOWERS WERE OVER NORTHEAST IOWA. TRUETT/SCHUMACHER
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 7:08 PM CDT | Severe Thunderstorm Warning | DMX | Audubon | 37 min |
| Jul 8, 7:28 PM CDT | Severe Thunderstorm Warning | DMX | Guthrie | 36 min |
| Jul 8, 8:25 PM CDT | Severe Thunderstorm Warning | DMX | Poweshiek | 22 min |
| Jul 8, 9:39 PM CDT | Tornado Warning | DMX | Ringgold, Taylor | 26 min |
| Jul 8, 10:31 PM CDT | Tornado Warning | DMX | Decatur | 29 min |
| Jul 8, 10:45 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Monroe | 30 min |
Nearby
Tornado Warnings in Iowa, 1986Every tornado warning in 1986Tornadoes 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.