Alert archive / Iowa / Tornado Warnings in 1986
Tornado Warning 21, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at Jul 28, 1986, 7:16 PM CDT for Sioux County, Iowa. It was in force for 29 min. 2 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, 7:16 PM CDT (00:16 UTC)
- Expired
- Jul 28, 1986, 7:45 PM CDT
- In force
- 29 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Sioux 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, 7:20 PM CDT | Thunderstorm Wind 52 | Sioux, IA | |
| Jul 28, 7:35 PM CDT | Thunderstorm Wind 52 | Sioux, 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, 0.3 hours before the alert went out and 197 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 KFSD 290016 TORFSD IAC167-290045- BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 716 PM CDT MON JUL 28 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 745 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF NORTHWEST IOWA...SIOUX SOME OF THE CITIES INCLUDED IN THIS WARNING ARE SIOUX CENTER AND ORANGE CITY IOWA. AT 705 PM CDT A FUNNEL CLOUD WAS REPORTED NEAR ROCK VALLEY IOWA AND AT 710 PM CDT A FUNNEL CLOUD WAS REPORTED 2 MILES SOUTH OF GEORGE IOWA. THESE THUNDERSTORMS WERE MOVING EASTSOUTHEAST AT 30 MPH. IF YOU ARE IN THE PATH OF THIS TORNADO...YOU SHOULD GO TO A BASEMENT SHELTER IF 8AVAILABLE. OTHERWISE GO TO A CENTRAL INTERIOR ROOM ON THE LOWEST FLOOR POSSIBLE. CARS AND MOBILE HOMES SHOULD BE ABANDONED FOR A REINFORCED BUILDING.
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, 7:22 PM CDT | Tornado Warning | FSD | Woodbury | 38 min |
| Jul 28, 7:29 PM CDT | Severe Thunderstorm Warning | FSD | O'Brien | 61 min |
| Jul 28, 7:43 PM CDT | Tornado Warning | FSD | O'Brien | 62 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.