Alert archive / Iowa / River Flood Warnings in 2024

River Flood Warning 18, NWS Des Moines, IA

May 21, 2024Marshall County, Iowa

NWS Des Moines, IA issued this river flood warning at May 21, 2024, 8:50 PM CDT for Marshall County, Iowa. It took effect at May 22, 2024, 1:00 PM CDT. It was in force for 42 hr.

The area

The counties it named.

The facts

Issued: May 21, 2024, 8:50 PM CDT (01:50 UTC)
In effect from: May 22, 2024, 1:00 PM CDT
Expired: May 24, 2024, 7:00 AM CDT
In force: 42 hr
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Flood severity: Minor

County Marshall County, IA

The radar

The Des Moines radar (KDMX), 69 km from the middle of the area, began a volume at 01:53 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 Iowa River at Marshalltown (MIWI4). The gauge peaked at 20.00 ft at May 23, 2024, 6:00 AM CDT.

Action stage: 14 ft
Minor stage: 19 ft
Moderate stage: 23 ft
Major stage: 26 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 05451500, 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 Des Moines, IA wrote its last area forecast discussion before this river flood warning went out at May 21, 6:35 PM CDT, 2 hours 15 minutes earlier.

Area forecast discussion, May 21, 6:35 PM CDT, 2 hours 15 minutes before

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Hazardous weather outlook, May 21, 2:15 PM CDT, 6 hours 35 minutes before

Hazardous Weather Outlook
National Weather Service Des Moines IA
215 PM CDT Tue May 21 2024

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-221915-
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun-
Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene-
Boone-Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-
Poweshiek-Cass-Adair-Madison-Warren-Marion-Mahaska-Adams-Union-
Clarke-Lucas-Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-
Appanoose-Davis-
215 PM CDT Tue May 21 2024

This Hazardous Weather Outlook is for portions of central Iowa,
north central Iowa, northeast Iowa, northwest Iowa, south central
Iowa, southeast Iowa, southwest Iowa, and west central Iowa.

.DAY ONE...This Afternoon and Tonight

A cold front that will be moving eastward across the state of Iowa
to generate a line of strong-severe storms during the afternoon
and evening hours with tornadoes, damaging winds, flash flooding,
and large hail all possible with the strongest storms. The worst
of the storms will be primarily during the 3 pm to 9 pm timeframe.
Winds could gust over 40 mph at times this evening as the storms
move off to the east.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Additional thunderstorm chances return at times Friday and
through the weekend. The severe weather potential for these days
will be better determined in the coming days.

.SPOTTER INFORMATION STATEMENT...

In the hours before

Local storm report, May 21, 6:11 PM CDT, 2 hours 39 minutes before

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Local storm report, May 21, 6:13 PM CDT, 2 hours 37 minutes before

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Local storm report, May 21, 6:14 PM CDT, 2 hours 36 minutes before

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Local storm report, May 21, 6:22 PM CDT, 2 hours 28 minutes before

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Local storm report, May 21, 6:24 PM CDT, 2 hours 26 minutes before

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Local storm report, May 21, 6:30 PM CDT, 2 hours 20 minutes before

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The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 21, 7:53 PM CDT	River Flood Warning	DMX	Webster	4 days
May 21, 8:05 PM CDT	River Flood Warning	DMX	Humboldt, Kossuth	66 hr
May 21, 8:43 PM CDT	River Flood Warning	DMX	Black Hawk	61 hr
May 22, 4:30 AM CDT	River Flood Warning	DMX	Black Hawk, Butler	29 hr
May 22, 11:04 AM CDT	Areal Flood Warning	DMX	Butler	12 hr
May 22, 11:10 AM CDT	River Flood Warning	DMX	Black Hawk	71 hr
May 22, 11:10 AM CDT	River Flood Warning	DMX	Black Hawk, Bremer, Butler	32 hr

Nearby

River Flood Warnings in Iowa, 2024 Every river flood warning in 2024

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.