Alert archive / Iowa / Tornado Warnings in 1986
Tornado Warning 16, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Jul 13, 1986, 10:20 PM CDT for Audubon County, Cass County, Iowa. It was in force for 30 min.
The area
The counties it named.
The facts
- Issued
- Jul 13, 1986, 10:20 PM CDT (03:20 UTC)
- Expired
- Jul 13, 1986, 10:50 PM CDT
- In force
- 30 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Audubon County, IA, Cass 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, 3.3 hours before the alert went out and 123 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
- 3607 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 182 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 140324 TORDSM IAC009-029-140350- BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DES MOINES IA 1020 PM CDT SUN JUL 13 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 1050 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF SOUTHWEST IOWA...SOUTHERN AUDUBON AND NORTHEAST CASS AT 1020 PM..DES MOINES WEATHER RADAR NOW INDICATED A TORNADO ALONG THE AUDUBON..CASS COUNTY LINE..ABOUT 10 MILES SOUTH OF AUDUBON OR ABOUT 60 MILES WEST OF DES MOINES. THE STORM WAS MOVING EAST AT 20 TO 25 MPH..AND WILL CONTINUE TO MOVE EAST ALONG THE CASS..ADAIR COUNTY LINE. THIS WARNING INCLUDES THE CITY OF ANITA. < 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. FERRY/TRUETT
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 13, 7:49 PM CDT, 2 hours 31 minutes before
RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 740 PM CDT SUN JUL 13 1986 ...FLASH FLOOD WATCH TONIGHT FOR SOUTHWEST AND SOUTH CENTRAL IOWA... ...THUNDERSTORM DEVELOPS IN SOUTHWEST IOWA... AT 730 PM CDT... A STRONG THUNDERSTORM HAD DEVELOPED OVER SOUTHWEST IOWA...25 MILES EAST OF COUNCIL BLUFFS NEAR OAKLAND. THIS STORM WILL PRODUCE BRIEF HEAVY RAINS AS IT MOVES EAST AT 20 MILES AN HOUR. THE STORM SHOULD BE SOUTH OF ATLANTIC BY 83I0 PM. AN INTENSE THUNDERSTORM WAS LOCATED IN EAST CENTRAL NEBRASKA ABOUT 35 MILES NORTHWEST OF COUNCIL BLUFFS. THIS STORM WAS ALSO MOVING EAST AT 20 TO 25 MILES AN HOUR AND SHOULD CROSS THE IOWA BORDER SOUTH OF MONDAMIN BY 830 PM. FERRY
Special weather statement, Jul 13, 8:49 PM CDT, 1 hour 31 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 845 PM CDT SUN JUL 13 1986 ...FLASH FLOOD WATCH TONIGHT FOR SOUTHWEST AND SOUTH CENTRAL IOWA... AT 830 PM CDT... A SEVERE THUNDERSTORM WAS INDICATED IN SOUTHWEST IOWA 35 MILES EAST OF COUNCIL BLUFFS OR 5 MILES WEST OF ATLANTIC. ONE AND ONE-HALF INCH HAIL WAS REPORTED FROM THIS STORM AT 815 PM AS IT CROSSED THE CASS AND POTTAWATTAMIE COUNTY LINE. THE STORM WAS MOVING EAST AT 15 MILES AN HOUR AND SHOULD BE IN WESTERN ADAIR COUNTY BY 930 PM. IN ADDITION TO THE LARGE HAIL..VERY HEAVY RAINS AND HIGH WINDS CAN BE EXPECTED FROM THIS STORM. BECAUSE OF THE SLOW MOVEMENT OF THE STORM LARGE AMOUNTS OF RAIN ARE POSSIBLE OVER CASS AND WESTERN ADAIR COUNTIES. PEOPLE IN FLOOD PRONE AREAS SHOULD REMAIN ALERT AND BE READY TO MOVE QUICKLY AS RAPID RISES IN WATER LEVELS ARE POSSIBLE. ANOTHER STRONG THUNDERSTORM WAS INDICATED ALONG THE MISSOURI RIVER 15 MIL}ES NORTH OF COUNCIL BLUFFS. THIS STORM WAS MOVING EAST AT 15 MILES AN HOUR. FERRY
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 7:55 PM CDT | Severe Thunderstorm Warning | DMX | Cass | 65 min |
| Jul 13, 8:25 PM CDT | Tornado Warning | DMX | Cass | 55 min |
| Jul 13, 9:19 PM CDT | Severe Thunderstorm Warning | DMX | Adair | 56 min |
| Jul 13, 9:40 PM CDT | Severe Thunderstorm Warning | DMX | Cass | 35 min |
| Jul 13, 10:13 PM CDT | Severe Thunderstorm Warning | DMX | Audubon, Cass | 32 min |
| Jul 13, 10:36 PM CDT | Severe Thunderstorm Warning | DMX | Adair | 39 min |
| Jul 13, 10:41 PM CDT | Flash Flood Warning | DMX | Adair | 89 min |
| Jul 13, 11:04 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Madison, Union | 36 min |
| Jul 13, 11:40 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Lucas | 60 min |
| Jul 14, 12:15 AM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Lucas, Wayne | 45 min |
| Jul 14, 12:58 AM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Wayne | 62 min |
| Jul 14, 3:00 AM CDT | Severe Thunderstorm Warning | DMX | Adair | 30 min |
| Jul 14, 9:18 AM CDT | Severe Thunderstorm Warning | DMX | Clay | 42 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.