Alert archive / South Dakota / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 32, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at May 11, 1986, 7:24 PM CDT for Brule County, South Dakota. It was in force for 66 min.
The area
The counties it named.
The facts
- Issued
- May 11, 1986, 7:24 PM CDT (00:24 UTC)
- Expired
- May 11, 1986, 8:30 PM CDT
- In force
- 66 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Brule County, SD
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
Aberdeen, SD (KHON), launched 00:00Z, 0.4 hours before the alert went out and 142 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
- 1023 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 1843 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 115 m²/s²
- 0-3 km storm-relative helicity
- 235 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 10.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFSD 120024 SVRFSD SDC015-120130- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 724 PM CDT SUN MAY 11 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 830 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF SOUTH CENTRAL SOUTH DAKOTA...BRULE SOME OF THE CITIES INCLUDED IN SOUTHCENTRAL SOUTH DAKOTA ARE CHAMBERLAIN AND KIMBALL. AT 720 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM OVER THE SOUTHWEST CORNOR OF BRULE COUNTY OR ABOUT 20 MILES SOUTH OF CHAMBERLAIN MOVING TO THE NORTHEAST AT 30 MPH. 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 AREA. THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR NO ADVANCE WARNING SO BE ON THE LXOOKOUT. KOSCIELSKI
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, May 11, 7:18 PM CDT, 6 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 705 PM CDT SUN MAY 11 1986 ...THUNDERSTORMS DEVELOP OVER THE CENTRAL... THUNDERSTORMS WITH VERY HEAVY RAIN HAD DEVELOPED SINCE 615 PM CDT OVER THE SOUTH CENTRAL AND CENTRAL PARTS OF SOUTH DAKOTA. BRIEF HEAVY RAIN AND SOME SMALL HAIL MAY BE PRODUCED FROM THE SCATTERED THUNDERSTORMS OVER THOSE PARTS OF THE STATE. THE THUNDERSTORMS WERE MOVING TO THE NORTHEAST AT 25 MPH. AT 700 PM CDT THE THUNDERSTORMS WITH VERY HEAVY RAIN WERE OVER LAKE FRANCIS CASE..NORTHEAST OF WINNER AND SOUTHWEST OF GANN VALLEY. THE MOVEMENT OF THESE STORMS WILL TAKE THEM INTO CENTRAL BRULE AND SOUTHERN HAND COUNTIES RESPECTIVELY. CAMPERS AND BOATEORS IN THE PATHS OF THE THUNDERSTORMS SHOULD GET OUT OF THE WATER AND BE PREPARED FOR THE APPROACHING THUNDERSTORMS. WEILAND
Special weather statement, May 11, 7:20 PM CDT, 4 minutes before
SPECIAL WEATHER STATEMENT CORRECTED NATIONAL WEATHER SERVICE SIOUX FALLS SD 705 PM CDT SUN MAY 11 1986 ...THUNDERSTORMS DEVELOP OVER THE CENTRAL... THUNDERSTORMS WITH VERY HEAVY RAIN HAD DEVELOPED SINCE 615 PM CDT OVER THE SOUTH CENTRAL AND CENTRAL PARTS OF SOUTH DAKOTA. BRIEF HEAVY RAIN AND SOME SMALL HAIL MAY BE PRODUCED FROM THE SCATTERED THUNDERSTORMS OVER THOSE PARTS OF THE STATE. THE THUNDERSTORMS WERE MOVING TO THE NORTHEAST AT 25 MPH. AT 700 PM CDT THE THUNDERSTORMS WITH VERY HEAVY RAIN WERE OVER LAKE FRANCIS CASE..NORTHEAST OF WINNER AND SOUTHWEST OF GANN VALLEY. THE MOVEMENT OF THESE STORMS WILL TAKE THEM INTO CENTRAL BRULE AND SOUTHERN HAND COUNTIES AT 740 PM CDRT RESPECTIVELY. CAMPERS AND BOATERS IN THE PATHS OF THE THUNDERSTORMS SHOULD GET OUT OF THE WATER AND BE PREPARED FOR THE APPROACHING THUNDERSTORMS. WEILAND
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 9:32 PM CDT | Severe Thunderstorm Warning | FSD | Todd | 3 hr |
Nearby
Severe Thunderstorm Warnings in South Dakota, 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.