Alert archive / Iowa / River Flood Watches in 2017

River Flood Watch 4, NWS Des Moines, IA

May 21, 2017Dallas County, Greene County, Iowa

NWS Des Moines, IA issued this river flood watch at May 21, 2017, 3:54 AM CDT for Dallas County, Greene County, Iowa. It took effect at May 22, 2017, 7:00 PM CDT. It was in force for 3 days.

The area

The counties it named.

The facts

Issued: May 21, 2017, 3:54 AM CDT (08:54 UTC)
In effect from: May 22, 2017, 7:00 PM CDT
Expired: May 26, 2017, 1:00 AM CDT
In force: 3 days
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Flood severity: None

Counties Dallas County, IA, Greene County, IA

The radar

The Des Moines radar (KDMX), 44 km from the middle of the area, began a volume at 08:52 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 North Raccoon River near Perry (PROI4).

Action stage: 14 ft
Minor stage: 15 ft
Moderate stage: 18 ft
Major stage: 20 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 watch 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 watch went out at May 21, 3:32 AM CDT, 22 minutes earlier.

Area forecast discussion, May 21, 3:32 AM CDT, 22 minutes before

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Hazardous weather outlook, May 20, 7:35 PM CDT, 8 hours 19 minutes before

Hazardous Weather Outlook
National Weather Service Des Moines IA
735 PM CDT Sat May 20 2017

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-220045-
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-
735 PM CDT Sat May 20 2017

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Tonight

Due to recent and expected rainfall early this coming week, a
Flood Watch has been issued. Please refer to the National Weather
Service website at weather.gov/desmoines for further details.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

A Flood Watch have been issued. Please refer to the National
Weather Service website at weather.gov/desmoines for further
details.

Thunderstorms are forecast Monday into Tuesday morning. A few
strong to marginally severe storms are possible. Hail and wind
would be the main threats from any marginally severe storm.

.SPOTTER INFORMATION STATEMENT...

Spotters activation is not likely at this time. However, rainfall
amounts and flood reports would be appreciated area wide.

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 8:35 PM CDT	River Flood Warning	DMX	Polk	5 days
May 21, 3:41 AM CDT	River Flood Warning	DMX	Polk	51 hr

Nearby

River Flood Watches in Iowa, 2017 Every river flood watch in 2017

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.