Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 121, NWS Sioux Falls, SD

August 5, 1987Yankton County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 5, 1987, 11:26 PM CDT for Yankton County, South Dakota. It was in force for 34 min.

The area

The counties it named.

The facts

Issued: Aug 5, 1987, 11:26 PM CDT (04:26 UTC)
Expired: Aug 6, 1987, 12:00 AM CDT
In force: 34 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Yankton 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

Omaha, NE (KOAX), launched 00:00Z, 4.4 hours before the alert went out and 206 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3594 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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

Local storm report, Aug 5, 9:02 PM CDT, 2 hours 24 minutes before

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Special weather statement, Aug 5, 9:43 PM CDT, 1 hour 43 minutes before

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Local storm report, Aug 5, 10:37 PM CDT, 49 minutes before

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Special weather statement, Aug 5, 10:39 PM CDT, 47 minutes before

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Special weather statement, Aug 5, 11:14 PM CDT, 12 minutes before

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The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 5, 7:01 PM CDT	Tornado Warning	FSD	Brule	29 min
Aug 5, 7:30 PM CDT	Tornado Warning	FSD	Brule	60 min
Aug 5, 8:12 PM CDT	Severe Thunderstorm Warning	FSD	Gregory, Tripp	63 min
Aug 5, 8:27 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule, Charles Mix	63 min
Aug 5, 9:15 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Gregory, Tripp	60 min
Aug 5, 10:09 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, Turner	66 min
Aug 5, 10:27 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	63 min
Aug 5, 10:27 PM CDT	Severe Thunderstorm Warning	FSD	Douglas	63 min
Aug 5, 11:57 PM CDT	Severe Thunderstorm Warning	FSD	Clay	33 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1987 Every severe thunderstorm warning in 1987

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.