Alert archive / Iowa / River Flood Watches in 2018

River Flood Watch 41, NWS Des Moines, IA

September 4, 2018Black Hawk County, Bremer County, Butler County, Iowa

NWS Des Moines, IA issued this river flood watch at Sep 4, 2018, 9:34 AM CDT for Black Hawk County, Bremer County, Butler County, Iowa. It took effect at Sep 5, 2018, 2:12 PM CDT. It was in force for .

The area

The counties it named.

The facts

Issued
Sep 4, 2018, 9:34 AM CDT (14:34 UTC)
In effect from
Sep 5, 2018, 2:12 PM CDT
Expired
Sep 5, 2018, 10:18 AM CDT
In force
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Flood severity
None

Counties Black Hawk County, IA, Bremer County, IA, Butler County, IA

The radar

The Des Moines radar (KDMX), 146 km from the middle of the area, began a volume at 14:34 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 Shell Rock River at Shell Rock (SHRI4). The gauge peaked at 14.48 ft at Sep 6, 2018, 10:00 AM CDT.

actionminormoderate1012141609/0409/0509/06
Action stage
10 ft
Minor stage
12 ft
Moderate stage
16 ft
Major stage
18 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 05462000, 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 Sep 4, 6:30 AM CDT, 3 hours 4 minutes earlier.

Area forecast discussion, Sep 4, 6:30 AM CDT, 3 hours 4 minutes before
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Hazardous weather outlook, Sep 4, 3:59 AM CDT, 5 hours 35 minutes before
Hazardous Weather Outlook
National Weather Service Des Moines IA
359 AM CDT Tue Sep 4 2018

IAZ004>007-015>017-023>028-033>039-047>050-059>062-051000-
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun-
Webster-Hamilton-Hardin-Grundy-Black Hawk-Boone-Story-Marshall-
Tama-Dallas-Polk-Jasper-Poweshiek-
359 AM CDT Tue Sep 4 2018

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

A Flash Flood Watch is in effect for the area today through late
tonight. Also, river flooding warnings are in effect for portions
of the Cedar River and Iowa River basins.  Please refer to the
National Weather Service website at weather.gov/desmoines for
further details.

Widespread thunderstorms are forecast by around midday today and
look to continue through late tonight into early Wednesday
morning. Heavy rain at times may lead to localized flash flooding.
There is also the potential for a few strong to potentially
severe storms with the threat of large hail, damaging wind and a
tornado or two.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

The very active weather pattern persist throughout the rest of the
work week and into the weekend. Heavy rain potential continues to
be the main concern and with many swollen rivers and streams as
well as very saturated grounds, this combination may lead to
additional river flooding and flash flooding Wednesday through
Saturday.

.SPOTTER INFORMATION STATEMENT...

Spotters might be needed today into tonight for flash flood and
severe weather potential. Spotters may also be needed at times
throughout the rest of the week.

IAZ044>046-057-058-070>075-081>086-092>097-051000-
Crawford-Carroll-Greene-Audubon-Guthrie-Cass-Adair-Madison-Warren-
Marion-Mahaska-Adams-Union-Clarke-Lucas-Monroe-Wapello-Taylor-
Ringgold-Decatur-Wayne-Appanoose-Davis-
359 AM CDT Tue Sep 4 2018

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

Isolated to scattered thunderstorms are possible today into
tonight. Although the severe weather threat is low, a brief
stronger storms with hail and gusty winds cannot be ruled out.
Localized heavy rain is also possible.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

The very active weather pattern persist throughout the rest of the
work week and into the weekend. Heavy rain potential continues to
be the main concern and with many swollen rivers and streams as
well as very saturated grounds, this combination may lead to
river flooding and flash flooding at times Wednesday through
Saturday.

.SPOTTER INFORMATION STATEMENT...

Spotters might be needed today into tonight and at times through
the rest of the week.

KLP

In the hours before

Special weather statement, Sep 4, 4:07 AM CDT, 5 hours 27 minutes before
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      <h1 id="headline">This service is currently unavailable.</h1>
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 3, 7:32 PM CDTSpecial Weather StatementDMXBlack Hawk, Bremer, Grundy88 min
Sep 3, 7:43 PM CDTFlash Flood WarningDMXBlack Hawk3 hr
Sep 4, 3:33 AM CDTFlash Flood WatchDMXBlack Hawk, Boone, Bremer, Butler, Calhoun, Cerro Gordo and 22 more27 hr
Sep 4, 9:34 AM CDTRiver Flood WatchDMXCerro Gordo, Floyd, Worth13 hr
Sep 4, 2:21 PM CDTSevere Thunderstorm WarningDMXPalo Alto, Pocahontas14 min
Sep 4, 3:46 PM CDTTornado Warning Tornado observedDMXKossuth29 min
Sep 4, 4:45 PM CDTTornado WarningDMXHancock, Winnebago30 min
Sep 4, 5:09 PM CDTFlash Flood WarningDMXHancock, Kossuth, Winnebago6 hr

Nearby

River Flood Watches in Iowa, 2018Every river flood watch in 2018

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.