Alert archive / Nebraska / River Flood Warnings in 2018

River Flood Warning 45, NWS Omaha, NE

September 21, 2018Washington County, Nebraska; Harrison County, Iowa

NWS Omaha, NE issued this river flood warning at Sep 21, 2018, 10:06 AM CDT for Washington County, Nebraska; Harrison County, Iowa. It took effect at Sep 23, 2018, 4:36 AM CDT. It was in force for 5 days.

The area

The counties it named.

The facts

Issued
Sep 21, 2018, 10:06 AM CDT (15:06 UTC)
In effect from
Sep 23, 2018, 4:36 AM CDT
Expired
Sep 28, 2018, 10:00 AM CDT
In force
5 days
Issued by
NWS Omaha, NE
Area
Storm-based polygon
Flood severity
Minor

Counties Harrison County, IA, Washington County, NE

The radar

The Omaha radar (KOAX), 43 km from the middle of the area, began a volume at 15:05 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 Missouri River near Blair (BLAN1).

Action stage
23.5 ft
Minor stage
26.5 ft
Moderate stage
28.5 ft
Major stage
33 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 06609100, 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 Omaha, NE wrote its last area forecast discussion before this river flood warning went out at Sep 20, 6:10 PM CDT, 15 hours 56 minutes earlier.

Area forecast discussion, Sep 20, 6:10 PM CDT, 15 hours 56 minutes before
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Hazardous weather outlook, Sep 20, 3:33 PM CDT, 18 hours 33 minutes before
Hazardous Weather Outlook
National Weather Service Omaha/Valley NE
333 PM CDT Thu Sep 20 2018

IAZ043-055-056-069-079-080-090-091-NEZ015-018-032>034-042>045-
050>053-065>068-078-088>093-211045-
Monona-Harrison-Shelby-Pottawattamie-Mills-Montgomery-Fremont-
Page-Thurston-Wayne-Stanton-Cuming-Burt-Platte-Colfax-Dodge-
Washington-Butler-Saunders-Douglas-Sarpy-Seward-Lancaster-Cass-
Otoe-Saline-Jefferson-Gage-Johnson-Nemaha-Pawnee-Richardson-
333 PM CDT Thu Sep 20 2018

This Hazardous Weather Outlook is for portions of southwest
Iowa...west central Iowa...east central Nebraska...northeast
Nebraska and southeast Nebraska.

.DAY ONE...Tonight and Friday

A band of strong to severe thunderstorms is expected to spread
east across the area this afternoon through this evening, along
and ahead of a cold front. The primary hazard with these storms is
damaging winds, though some hail is also possible.

Minor flooding will continue along the Missouri River upstream
of Lewis and Clark Lake in Knox County and in the vicinity of
Brownville.

.DAYS TWO THROUGH SEVEN...Friday night through Thursday

Minor flooding will continue along the Missouri River upstream of
Lewis and Clark Lake in Knox County. Minor flooding along the
Missouri River in the vicinity of Brownville should subside by
Friday.

.SPOTTER INFORMATION STATEMENT...

Storm spotter activation may be needed on a localized basis late
this afternoon and this evening.

NEZ011-012-016-017-030-031-211045-
Knox-Cedar-Antelope-Pierce-Boone-Madison-
333 PM CDT Thu Sep 20 2018

This Hazardous Weather Outlook is for portions of northeast
Nebraska.

.DAY ONE...Tonight and Friday

Isolated strong storms are possible this afternoon into early
evening. Gusty winds and some small hail are possible.

Minor flooding will continue along the Missouri River upstream
of Lewis and Clark Lake in Knox County and in the vicinity of
Brownville.

.DAYS TWO THROUGH SEVEN...Friday night through Thursday

Minor flooding will continue along the Missouri River upstream of
Lewis and Clark Lake in Knox County.

.SPOTTER INFORMATION STATEMENT...

Storm spotter activation will not be required through Friday.

The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 20, 7:10 PM CDTSevere Thunderstorm WarningOAXJefferson, Saline35 min
Sep 20, 7:37 PM CDTSevere Thunderstorm WarningOAXGage, Jefferson, Lancaster, Saline, Seward23 min
Sep 20, 8:02 PM CDTSevere Thunderstorm WarningOAXCass, Gage, Johnson, Lancaster, Nemaha, Otoe and 1 more28 min
Sep 20, 8:24 PM CDTSevere Thunderstorm WarningOAXCass, Johnson, Nemaha, Otoe, Pawnee, Richardson and 2 more36 min
Sep 20, 9:41 PM CDTSpecial Weather StatementOAXRichardson34 min
Sep 21, 10:06 AM CDTRiver Flood WarningOAXCass13 days
Sep 21, 10:06 AM CDTRiver Flood WarningOAXOtoe40 days
Sep 21, 10:06 AM CDTRiver Flood WarningOAXRichardson51 days
Sep 21, 10:25 AM CDTRiver Flood AdvisoryOAXDouglas, Sarpy8 days
Sep 20, 7:14 PM CDTSevere Thunderstorm WarningOAXHarrison, Pottawattamie, Shelby31 min
Sep 20, 7:56 PM CDTSpecial Weather StatementOAXShelby34 min
Sep 20, 8:49 PM CDTSevere Thunderstorm WarningOAXFremont, Mills, Montgomery, Page26 min

Nearby

River Flood Warnings in Nebraska, 2018River Flood Warnings in Iowa, 2018Every river flood warning 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.