Alert archive / South Dakota / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 121, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 27, 1986, 3:12 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
- Jul 27, 1986, 3:12 PM CDT (20:12 UTC)
- Expired
- Jul 27, 1986, 4:15 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
Aberdeen, SD (KHON), launched 12:00Z, 8.2 hours before the alert went out and 251 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
- 822 J/kg
- Mixed-layer CIN
- -203 J/kg
- Mixed-layer LCL
- 1324 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- -39 m²/s²
- 0-3 km storm-relative helicity
- 29 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, Jul 27, 10:15 AM CDT, 4 hours 57 minutes before
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<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
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The site you requested is temporarily down for maintenance or an unexpected outage.
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Please try again in a few minutes.
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</html>The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 11:41 PM CDT | Severe Thunderstorm Warning | FSD | Davison, Hanson | 64 min |
| Jul 27, 12:45 AM CDT | Severe Thunderstorm Warning | FSD | Brookings | 60 min |
| Jul 27, 4:18 PM CDT | Severe Thunderstorm Warning | FSD | Tripp | 57 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.