Alert archive / South Dakota / River Flood Warnings in 2023

River Flood Warning 28, NWS Sioux Falls, SD

April 12, 2023Union County, South Dakota; Plymouth County, Iowa

NWS Sioux Falls, SD issued this river flood warning at Apr 12, 2023, 3:19 AM CDT for Union County, South Dakota; Plymouth County, Iowa. It was in force for 21 days.

The area

The counties it named.

The facts

Issued: Apr 12, 2023, 3:19 AM CDT (08:19 UTC)
Expired: May 3, 2023, 3:19 AM CDT
In force: 21 days
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Flood severity: Minor

Counties Plymouth County, IA, Union County, SD

The radar

The Sioux Falls radar (KFSD), 92 km from the middle of the area, began a volume at 08:18 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 river

Written for the forecast point Big Sioux River near Richland (BSRS2).

Action stage: 1116 ft
Minor stage: 1117 ft
Moderate stage: 1119 ft
Major stage: 1123 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

What forecasters said that day

The local office's own words before this river flood 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 river flood warning went out at Apr 12, 3:07 AM CDT, 12 minutes earlier.

Area forecast discussion, Apr 12, 3:07 AM CDT, 12 minutes before

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Hazardous weather outlook, Apr 11, 6:45 PM CDT, 8 hours 34 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
Apr 11, 11:11 PM CDT	River Flood Warning	FSD	Beadle	81 days
Apr 12, 3:05 AM CDT	Fire Weather Watch	FSD	Bon Homme, Clay, Hutchinson, Lincoln, McCook, Minnehaha and 3 more	12 hr
Apr 12, 3:16 PM CDT	Red Flag Warning	FSD	Bon Homme, Charles Mix, Clay, Davison, Douglas, Gregory and 10 more	29 hr
Apr 12, 5:20 AM CDT	River Flood Warning	FSD	Lyon	49 hr
Apr 12, 2:23 PM CDT	River Flood Warning	FSD	Cottonwood, Murray	5 days

Nearby

River Flood Warnings in South Dakota, 2023 River Flood Warnings in Iowa, 2023 Every river flood 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; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.