Alert archive / Iowa / Tornado Warnings in 1986
Tornado Warning 25, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at Jul 28, 1986, 7:43 PM CDT for O'Brien County, Iowa. It was in force for 62 min. 3 reports 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 28, 1986, 7:43 PM CDT (00:43 UTC)
- Expired
- Jul 28, 1986, 8:45 PM CDT
- In force
- 62 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County O'Brien 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 28, 8:00 PM CDT | Thunderstorm Wind 52 | O'Brien, IA | |
| Jul 28, 8:15 PM CDT | Thunderstorm Wind 52 | O'Brien, IA | |
| Jul 28, 8:30 PM CDT | Thunderstorm Wind 61 | O'Brien, 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
Omaha, NE (KOAX), launched 00:00Z, 0.7 hours before the alert went out and 206 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
- 3613 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 74 m²/s²
- 0-3 km storm-relative helicity
- 119 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 KSUX 290043 RRA
TORSUX
IAC141-290145-
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX-CITY IA
743 PM CDT MON JUL 28 1986
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 845 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES:
IN NORTHWEST IOWA
..OBRIEN
AT 738 PM CDT A TORNADO WAS REPORTED ON THE GROUND 55 MILES NORTHEAST
OF SIOUX CITY...JUST SOUTH OF SHELDON IOWA.
THE TORNADO WAS MOVING SOUTHEAST AT 25 MILES AN HOUR.
IF YOU LIVE IN A HOME OR APARTMENT, SEEK SHELTER IN THE INNERMOST
PORTION OF THE BUILDING ON THE LOWEST FLOOR. GET TO A BASEMENT
IF ONE IS AVAILABLE. AVOID WINDOWS AND PROTECT YOUR BODY FROM
FLYING DEBRIS WITH CUSHIONS, BLANKETS OR PILLOWS.The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 7:03 PM CDT | Severe Thunderstorm Warning | FSD | Osceola | 57 min |
| Jul 28, 7:03 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 57 min |
| Jul 28, 7:16 PM CDT | Tornado Warning | FSD | Sioux | 29 min |
| Jul 28, 7:22 PM CDT | Tornado Warning | FSD | Woodbury | 38 min |
| Jul 28, 7:29 PM CDT | Severe Thunderstorm Warning | FSD | O'Brien | 61 min |
| Jul 28, 8:02 PM CDT | Severe Thunderstorm Warning | FSD | Sioux | 58 min |
| Jul 28, 8:03 PM CDT | Tornado Warning | FSD | Monona, Woodbury | 27 min |
| Jul 28, 8:18 PM CDT | Tornado Warning | FSD | Cherokee | 47 min |
| Jul 28, 8:34 PM CDT | Tornado Warning | FSD | Monona | 26 min |
| Jul 28, 9:02 PM CDT | Severe Thunderstorm Warning | FSD | Monona | 58 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.