Alert archive / Nebraska / River Flood Advisories in 2018

River Flood Advisory 13, NWS Omaha, NE

August 20, 2018Douglas County, Sarpy County, Nebraska; Pottawattamie County, Iowa

NWS Omaha, NE issued this river flood advisory at Aug 20, 2018, 11:22 AM CDT for Douglas County, Sarpy County, Nebraska; Pottawattamie County, Iowa. It was in force for 51 hr.

The area

The counties it named.

The facts

Issued: Aug 20, 2018, 11:22 AM CDT (16:22 UTC)
Expired: Aug 22, 2018, 2:02 PM CDT
In force: 51 hr
Issued by: NWS Omaha, NE
Area: Storm-based polygon

Counties Pottawattamie County, IA, Douglas County, NE, Sarpy County, NE

The radar

The Omaha radar (KOAX), 37 km from the middle of the area, began a volume at 16:23 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 at Omaha (OMHN1).

Action stage: 21 ft
Minor stage: 27 ft
Moderate stage: 32 ft
Major stage: 40 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 06610000, 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 advisory 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 advisory went out at Aug 20, 7:14 AM CDT, 4 hours 8 minutes earlier.

Area forecast discussion, Aug 20, 7:14 AM CDT, 4 hours 8 minutes before

Area Forecast Discussion
National Weather Service Omaha/Valley NE
714 AM CDT Mon Aug 20 2018

.SHORT TERM...(Today through Wednesday)
Issued at 322 AM CDT Mon Aug 20 2018

A majestic low pressure system was prominent on water vapor
imagery this morning, centered over southeast Nebraska/northern
Kansas. At the surface, low pressure deepened over northwest
Missouri. The surface low will continue to rotate into
southeastern Iowa this morning. Moderate precipitation associated
with the deformation zone of this system continued a along and
east of the Missouri river throughout southwest Iowa overnight.
Latest model runs have continued to shift heaviest precipitation
further east into southcentral Iowa through this morning. While
most of the forecast area will likely receive at least some
rainfall through the morning hours as the low rotates through,
current guidance suggests generally additional accumulations of 1"
or less can be expected across most of eastern Nebraska, with
higher amounts up 3" along and east of the Missouri River. Of
course locally higher amounts may be possible, especially in
southwest Iowa. Based on this new data, decided to trim Flash
Flood Watch to highlight the main threat east of the Missouri
River. Showers will diminish in coverage this afternoon, with
precip finally moving east of the forecast area Monday evening.

In addition to the heavy rainfall, gusty winds will also be a factor
Monday. A strong LLJ approaching 50kts will move through the area
this morning. Anticipate gusts around 30-40kts could mix down at
the surface with isolated stronger gusts probable. The combination
of strong winds and saturated soil could lead to isolated tree
damage. Winds are expected to diminish along with precip as the
system moves out Monday evening.

Dry weather is expected Tuesday through Wednesday. Temperatures will
remain below normal, in the mid to upper 70s both days, but will
gradually warm through midweek.

.LONG TERM...(Wednesday night through Sunday)
Issued at 322 AM CDT Mon Aug 20 2018

Temperatures will continue to heat up into the 80s and close to 90
by the weekend.  Dry weather will continue Thursday before
precipitation chances increase Friday as a shortwave moves through
the region. High pressure builds across the southeastern US over the
weekend, but models continue to diverge on exact details. While
Saturday appears to remain dry, the ECMWF differs from the GFS,
which brings at least a slight chance for precipitation to the
region on Sunday.

&&

.AVIATION...(For the 12Z TAFS through 12Z Tuesday morning)
Issued at 651 AM CDT Mon Aug 20 2018

A strengthening surface low pressure over southwest Iowa will
bring rain and IFR to MVFR visibilities across southwest Iowa and
eastern Nebraska until 21/00Z. Strong northwest surface winds with
gusts greater than 30 kts at KOMA. Strongs surface winds will
persist until 23Z-00Z as low moves eastward out of the area. In
addition LLWS of 50 kts is forecast at KOMA from 14Z to 18Z at
2000 feet.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...
NE...Flash Flood Watch until noon CDT today for NEZ015-033-034-044-
     045-051>053-066>068-090>093.

IA...Flash Flood Watch until noon CDT today for IAZ043-055-056-069-
     079-080-090-091.

&&

SHORT TERM...KG
LONG TERM...KG
AVIATION...Smith

Hazardous weather outlook, Aug 20, 11:06 AM CDT, 16 minutes before

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In the hours before

Local storm report, Aug 20, 10:08 AM CDT, 1 hour 14 minutes before

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Local storm report, Aug 20, 10:33 AM CDT, 49 minutes before

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Local storm report, Aug 20, 10:40 AM CDT, 42 minutes before

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Local storm report, Aug 20, 10:57 AM CDT, 25 minutes before

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Local storm report, Aug 20, 10:59 AM CDT, 23 minutes before

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Local storm report, Aug 20, 11:14 AM CDT, 8 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 11:57 PM CDT	River Flood Warning	OAX	Otoe	4 days
Aug 19, 11:57 PM CDT	River Flood Warning	OAX	Nemaha	5 days
Aug 19, 11:57 PM CDT	River Flood Warning	OAX	Richardson	5 days
Aug 20, 5:33 AM CDT	Special Weather Statement	OAX	Douglas, Sarpy	42 min
Aug 20, 8:06 AM CDT	Flash Flood Warning	OAX	Douglas	6 hr
Aug 20, 8:54 AM CDT	Areal Flood Warning	OAX	Burt, Cuming, Dodge, Thurston, Washington	15 hr
Aug 20, 10:15 AM CDT	Flash Flood Warning	OAX	Cass, Douglas, Sarpy	4 hr
Aug 20, 10:28 AM CDT	River Flood Warning	OAX	Cass	3 days
Aug 20, 1:48 PM CDT	Areal Flood Warning	OAX	Cass, Dodge, Douglas, Sarpy, Saunders, Washington	9 hr
Aug 20, 5:07 AM CDT	Flash Flood Warning	OAX	Harrison, Pottawattamie, Shelby	6 hr
Aug 20, 5:23 PM CDT	River Flood Warning	OAX	Fremont	28 hr

Nearby

River Flood Advisories in Nebraska, 2018 River Flood Advisories in Iowa, 2018 Every river flood advisory 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.