Alert archive / South Dakota / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 199, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Sep 24, 1986, 8:12 PM CDT for Mellette County, Todd County, South Dakota. It was in force for 63 min.
The area
The counties it named.
The facts
- Issued
- Sep 24, 1986, 8:12 PM CDT (01:12 UTC)
- Expired
- Sep 24, 1986, 9:15 PM CDT
- In force
- 63 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Mellette County, SD, Todd 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
Rapid City, SD (KRAP), launched 00:00Z, 1.2 hours before the alert went out and 188 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
- 1041 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 1234 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 217 m²/s²
- 0-3 km storm-relative helicity
- 297 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 6.7
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFSD 250112 SVRFSD SDC095-121-250215- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 812 PM CDT WED SEP 24 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 915 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF SOUTH CENTRAL SOUTH DAKOTA...EASTERN MELLETTE AND EASTERN TODD SOME OF THE CITIES INCLUDED IN THIS WARNING ARE MISSION AND WHITE RIVER. AT 805 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM NEAR MISSION SOUTH DAKOTA OR ABOUT 25 MILES NORTH OF VALENTINE NEBRASKA MOVING TO THE NORTH NORTHEAST AT 40 MPH. AT 753 PM CDT A TORNADO TOUCHED DOWN ABOUT 1/2 MILE EAST OF CIDER BUTTE IN WESTERN MELLETTE COUNTY FROM A DIFFERENT STORM. 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 LOOKOUT. 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, Sep 24, 7:51 PM CDT, 21 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 740 PM CDT WED SEP 24 1986 ...TORNADO WATCH FOR WESTERN SOUTH DAKOTA UNTIL MIDNIGHT CDT... AT 730 PM CDT...SCATTERED THUNDERSTORMS...SOME WITH VERY HEAVY RAIN... HAD DEVELOPED IN SOUTH CENTRAL SOUTH DAKOTA...IN A 20 MILE WIDE BAND FROM JUST EAST OF RAPID CITY TO 60 MILES WEST OF WINNER. THE STRONGEST THUNDERSTORM WAS LOCATED IN SOUTHWEST MELLETTE COUNTY... 50 MILES WEST OF WINNER...MOVING NORTH AT 35 MILES AN HOUR. PERSONS IN THE PATH OF THIS STORM SHOULD REMAIN ALERT AND BE PREPARED TO SEEK SHELTER IF THREATENING WEATHER APPROACHES. ALSO...SCATTERED THUNDERSHOWERS AND RAINSHOWERS CONTINUED IN NOeRTHEAST SOUTH DAKOTA...NORTH OF A LINE FROM MOBRIDGE TO 50 MILES SOUTHEAST OF WATERTOWN. MOVEMENT WAS NORTH AT 35 MILES AN HOUR. STOREY
Local storm report, Sep 24, 8:00 PM CDT, 12 minutes before
STORM REPORT NATIONAL WEATHER SERVICE SIOUX FALLS SD 757 PM CDT WED SEP 25 1986 TORNADO ON GROUND FOR COUPLE OF MINUTES 1/2 MILE E OF CIDER BUTTE AT 753 PM CDT..ABOUT 15 MILES WEST OF WHITE RIVER IN MELLqETTE COUNTY. KOSCIELSK
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 24, 7:15 PM CDT | Severe Thunderstorm Warning | FSD | Mellette, Todd | 60 min |
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.