Alert archive / South Dakota / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 42, NWS Sioux Falls, SD

May 31, 1991Clay County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 31, 1991, 1:18 AM CDT for Clay County, South Dakota. It was in force for 42 min.

The area

The counties it named.

The facts

Issued: May 31, 1991, 1:18 AM CDT (06:18 UTC)
Expired: May 31, 1991, 2:00 AM CDT
In force: 42 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Clay County, SD

The nearest sounding before it

Omaha, NE (KOVN), launched 00:00Z, 6.3 hours before the alert went out and 184 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: NaN m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.4

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

Special weather statement, May 30, 11:46 PM CDT, 1 hour 32 minutes before

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Special weather statement, May 30, 11:47 PM CDT, 1 hour 31 minutes before

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Special weather statement, May 30, 11:55 PM CDT, 1 hour 23 minutes before

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Local storm report, May 31, 12:40 AM CDT, 38 minutes before

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Special weather statement, May 31, 12:52 AM CDT, 26 minutes before

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Special weather statement, May 31, 12:54 AM CDT, 24 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
May 31, 2:31 AM CDT	Severe Thunderstorm Warning	FSD	McCook, Minnehaha	29 min
May 31, 4:04 AM CDT	Severe Thunderstorm Warning	FSD	Charles Mix	26 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1991 Every severe thunderstorm warning in 1991

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.