Alert archive / Iowa / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 201, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Sep 28, 1986, 6:05 PM CDT for Osceola County, Sioux County, Iowa. It was in force for 55 min.
The area
The counties it named.
The facts
- Issued
- Sep 28, 1986, 6:05 PM CDT (23:05 UTC)
- Expired
- Sep 28, 1986, 7:00 PM CDT
- In force
- 55 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Osceola County, IA, Sioux 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 12:00Z, 11.1 hours before the alert went out and 216 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
- 3615 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 150 m²/s²
- 0-3 km storm-relative helicity
- 184 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 282305 SVRFSD IAC143-167-290000- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 605 PM CDT SUN SEP 28 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 700 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF NORTHWEST IOWA...WESTERN OSCEOLA AND EASTERN SIOUX SOME OF THE CITIES INCLUDED IN THIS WARNING ARE ALTON AND SIBLEY. AT 600 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM TEN MILES NORTHEAST OF IOUX CENTER IOWA. THE SEVERE THUNDERSTORM WAS MOVING EAST NORTHEAST AT 30 MPH. AT 547 PM CDT MARBLE SIZE HAIL WAS REPORTED FIFTEEN MILES WEST OF ROCK VALLEY AND ONE MILE WEST OF SIOUX CENTER. IF YOU ARE IN THE PATH OF THIS STORM..YOU SHOULD GET TO A REINFORCED SHELTER. A SEVERE THUNDERSTORM PRODUCES DAMAGING WINDS IN EXCESS OF 60 MPH..HAIL 3/4 INCH OR LARGER..DEADLY LIGHTNING..AND HEAVY RAIN THAT CAN QUICKLY FLOOD A LOW LYING ARLEA. THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR NO ADVANCE WARNING SO BE ON THE LOOKOUT. WEILAND
What forecasters said that day
The local office's own words before this severe thunderstorm 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, Sep 28, 4:49 PM CDT, 1 hour 16 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 445 PM CDT SUN SEP 28 1986 AT 443 PM CDT A LARGE INTENSE THUNDERSTORM WITH VERY HEAVY RAIN AND POSSIBLE HAIL DEVELOPED RAPIDLY OVER EASTCENTRAL CLAY INTO NORTHEAST UNION COUNTY IN EXTREME SOUTHEAST SOUTH DAKOTA. THE STORM RAN FROM ABOUT 5 MILES NORTH OF VERMILLION TO ALCESTER. THE STORM WAS MOVING TO THE NORTHEAST AT ABOUT 30 MPH AND WILL MOVE INTO SIOUX COUNTY IOWA BETWEEN 445PM AND 545 PM CDT. PEOPLE IN THE PATH OF THIS STORM SHOULD BE ALERT TO POSSIBLE SEVERE WEATHER. KOSCIELSKI
Special weather statement, Sep 28, 5:13 PM CDT, 52 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 515 PM CDT SUN SEP 28 1986 ...TORNADO WATCH FOR IDA...CHEROKEE AND OBRIEN COUNTIES TIL 11PM CDT... AT 500 PM CDT A TORNADO WATCH WAS IN EFFECT FOR IDA...CHEROKEE AND OBRIEN COUNTIES OF IOWA UNTIL 1100 PM CDT. NO SEVERE WEATHER HAD BEEN REPORTED BEFORE 500 PM CDT. VERY INTENSE THUNDERSTORMS WERE LOCATED IN MONONA COUNTY IOWA AND UNION COUNTY SOUTH DAKOTA AT 500 PM CDT. THESE STORMS WERE NEAR ONAWA OR ABOUT 25 MILES SOUTHEAST OF SIOUX CITY AND NEAR ALCESTER SOUTH DAKOTA OR ABOUT 40 MILES NORTHWEST OF SIOUX CITY. THESE STORMS HAVE THE POTENTIAL TO PRODUCE PEA TO MARBLE SIZE HAIL... STRONG GUSTY WINDS AND HEAVY RAIN AiS THEY MOVE NORTHEAST ACROSS THE SIOUXLAND AREA AT 35 MILES AN HOUR. STORMS WILL MOVE INTO EASTERN WOODBURY...SOUTHERN OBRIEN AND IDA COUNTIES BY 600 PM CDT. KROPP
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 28, 5:24 PM CDT | Tornado Warning | FSD | Sioux | 36 min |
| Sep 28, 5:42 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 63 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1986Every severe thunderstorm warning 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.