Alert archive / Iowa / Tornado Warnings in 1986
Tornado Warning 11, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Jun 29, 1986, 11:50 PM CDT for Polk County, Iowa. It was in force for 25 min.
The area
The counties it named.
The facts
- Issued
- Jun 29, 1986, 11:50 PM CDT (04:50 UTC)
- Expired
- Jun 30, 1986, 12:15 AM CDT
- In force
- 25 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Polk 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
Omaha, NE (KOAX), launched 00:00Z, 4.8 hours before the alert went out and 236 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3623 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 119 m²/s²
- 0-3 km storm-relative helicity
- 262 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 300450 RRA TORDSM IAC153-300515- BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DES MOINES IA 1150 PM CDT SUN JUN 29 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 1215 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF CENTRAL IOWA...SOUTHERN POLK THIS WARNING INCLUDES THE CITY OF DES MOINES. AT 1140 PM..A TORNADO TOUCHED DOWN IN WEST DES MOINES AT 19TH AND GRAND DEMOLISHING A QUIK TRIP STORE. THE THUNDERSTORM THAT PRODUCED THE TORNADO WAS MOVING SOUTHEAST AT AROUND 30 MPH. IF A TORNADO APPROACHES..TAKE COVER IMMEDIATELY. A BASEMENT.. INTERIOR HALLWAY..OR A ROOM ON THE LOWEST FLOOR IS THE SAFEST PLACE IN[ MOST BUILDINGS. IF YOU ARE IN A MOBILE HOME OR AN AUTOMOBILE.. LEAVE AT ONCE. TAKE COVER IN A STORM SHELTER..OR LIE IN A NEARBY DITCH OR DEPRESSION. HAHN
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, Jun 29, 6:45 PM CDT, 5 hours 5 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 643 PM CDT SUN JUN 29 1986 ..A TORNADO WATCH IS IN EFFECT FOR A SMALL PART OF EXTREME NORTHWEST IOWA UNTIL 10 PM THIS EVENING.. AT 635 PM CDT.. SCATTERED LIGHT SHOWERS HAD DEVELOPED ALONG THE IOWA/MINNESOTA BORDER BETWEEN SPENCER AND SPIRIT LAKE..MEANWHILE INTENSE THUNDERSTORMS WHICH HAVE HAD A HISTORY OF PRODUCING LARGE HAIL AND VERY HEAVY RAIN WERE ENTERING NORTHWEST IOWA. THE STORM WAS ENTERING PLYMOUTH COUNTY NEAR THE TOWN OF AKRON..ABOUT 25 MILES NORTH OF SIOUX CITY. THE SHOWERS AND STORMS WERE MOVING SOUTHEAST AT 25 TO 30 MILES AN HOUR. BARLOW
Special weather statement, Jun 29, 9:21 PM CDT, 2 hours 29 minutes before
<PQ< SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 915 PM CDT SUN JUN 29 1986 THE SEVERE THUNDERSTORM WARNING FOR GREENE COUNTY HAS EXPIRED. THE STORM HAS DECRESED IN INTENSITY AND^ WAS MOVING SOUTHEAST AROUND 30 MILES AN HOUR. FORSTER
Special weather statement, Jun 29, 10:48 PM CDT, 1 hour 2 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1045 PM CDT SUN JUN 29 1986 ...SEVERE THUNDERSTORM WATCH FOR A LARGE PART OF SOUTHERN AND CENTRAL IOWA UNTIL 5 AM MONDAY MORNING... NO SEVERE WEATHER HAS BEEN REPORTED IN IOWA BETWEEN 1010-1045 PM. AT 1035 PM...VERY STRONG THUNDERSTORMS WERE OVER WEST CENTRAL AND EAST CENTRAL IOWA. ONE STORM WAS JUST WEST OF GUTHRIE CENTER..50 MILES WEST OF DES MOINES. ANOTHER STORM WAS JUST EAST OF CEDAR RAPIDS. VERY HEAVY RAINS..BRIEF GUSTY WINDS AND POSSIBLY SOME SMALL HAIL CAN BE EXPECTED WITH THESE STORMS. ELSEWHERE..NUMEROUS SHOWERS AND SCATTERED THUNDERSTORMS EXTENDED FROM NORTHEAST INTO SOUTHWEST I/OWA. THE LEADING EDGE OF THE RAINFALL EXTENDED FROM THE QUAD CITIES THROUGH PELLA AND INDIANOLA TO THE SOUTH- WEST CORNER OF THE STATE. THE SHOWERS AND STORMS WERE MOVING SOUTHEAST AT 30 MILES AN HOUR. SIECZYNSKI
Special weather statement, Jun 29, 11:18 PM CDT, 32 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1115 PM CDT SUN JUN 29 1986
...STRONG THUNDERSTORMS APPROACHING DES MOINES...
AT 1105 PM...A NARROW BAND OF VERY STRONG THUNDERSTORMS WAS OVER
CENTRAL IOWA. THE BAND WAS 15 MILES WIDE AND STRETCHED FROM NEVADA
THROUGH SAYLORVILLE RESERVOIR AND ADEL TO CRESTON.
VERY HEAVY RAINS..FREQUENT DANGEROUS LIGHTNING AND BRIEF GUSTY WINDS
WILL BE EXPERIENCED WITH THE PASSAGE OF THESE STORMS.
BY 1215 AM THIS BAND OF STORMS SHOULD EXTEND FROM NEWTON THROUGH
INDIANOLA TO OSCEOLA.
THE STORMS WERE MOVING SOUTHEAST AT 30 MILES AN HOUR.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR A LARGE PART OF
SOUTHERN AND CENTRALH IOWA UNTIL 5 AM MONDAY MORNING.
SIECZYNSKISpecial weather statement, Jun 29, 11:46 PM CDT, 4 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1145 PM CDT SUN JUN 29 1986 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR A LARGE PART OF SOUTHERN AND CENTRAL IOWA UNTIL 5 AM MONDAY MORNING... NO SEVERE WEATHER HAS BEEN REPORTED IN IOWA BETWEEN 1040-1145 PM. WINDS GUSTS TO 52 MILES AN HOUR WERE RECORDED AT THE DES MOINES AIRPORT AT 1125 PM. AT 1135 PM...AN INTENSE THUNDERSTORM WAS IN EAST CENTRAL IOWA JUST WEST OF IOWA CITY..55 MILES WEST OF THE QUAD CITIES. OTHER STRONG STORMS WERE OVER CENTRAL AND SOUTHWEST IOWA IN AND AROUND NEVADA..DES MOINES..ADEL..WINTERSET AND CRESTON. VERY HEAVY RAINS..FREQUENT LIGHTNING AND WIND GUST BETWEEN 45U AND 50 MILES AN HOUR CAN BE EXPECTED WITH THESE STORMS. ELSEWHERE NUMEROUS SHOWERS AND SCATTERED THUNDERSTORMS EXTENDED FROM NORTHEAST INTO SOUTHWEST IOWA. THE SHOWERS AND STORMS WERE MOVNING SOUTHEAST AT 30 MILES AN HOUR. SIECZYNSKI
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 29, 7:30 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun | 45 min |
| Jun 29, 8:26 PM CDT | Severe Thunderstorm Warning | DMX | Greene | 49 min |
| Jun 29, 9:00 PM CDT | Severe Thunderstorm Warning | DMX | Emmet | 45 min |
| Jun 29, 10:00 PM CDT | Severe Thunderstorm Warning | DMX | Guthrie | 40 min |
| Jun 29, 10:18 PM CDT | Severe Thunderstorm Warning | DMX | Cass | 42 min |
| Jun 29, 10:25 PM CDT | Flash Flood Warning | DMX | Dallas, Polk | 6 hr |
| Jun 30, 1:12 AM CDT | Severe Thunderstorm Warning | DMX | Iowa, Poweshiek | 48 min |
| Jun 30, 3:45 AM CDT | Flash Flood Warning | DMX | Polk | 6 hr |
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.