Alert archive / South Dakota / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 24, NWS Sioux Falls, SD

May 11, 2023Clay County, Union County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 11, 2023, 2:50 PM CDT for Clay County, Union County, South Dakota. It was in force for 25 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 11, 2023, 2:50 PM CDT (19:50 UTC)
Expired: May 11, 2023, 3:15 PM CDT
In force: 25 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Clay County, SD, Union County, SD

The radar

The Sioux Falls radar (KFSD), 80 km from the middle of the area, began a volume at 19:51 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 7.8 hours before the alert went out and 339 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: 11 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 799 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -52 m²/s²
0-3 km storm-relative helicity: -38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

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.

NWS Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at May 11, 12:07 PM CDT, 2 hours 43 minutes earlier.

Area forecast discussion, May 11, 12:07 PM CDT, 2 hours 43 minutes before

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Hazardous weather outlook, May 11, 4:28 AM CDT, 10 hours 22 minutes before

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In the hours before

Local storm report, May 11, 10:24 AM CDT, 4 hours 26 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 11, 4:32 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	28 min
May 10, 11:48 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Woodbury	42 min
May 11, 12:27 AM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Sioux	33 min
May 11, 12:44 AM CDT	Severe Thunderstorm Warning	FSD	Cherokee, O'Brien, Plymouth, Sioux	23 min
May 11, 1:40 AM CDT	Severe Thunderstorm Warning	FSD	Lyon	50 min
May 10, 8:08 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Lyon	53 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2023 Every severe thunderstorm warning in 2023

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; radar from the NEXRAD Level II archive.