Alert archive / Iowa / River Flood Warnings in 2019

River Flood Warning 312, NWS Sioux Falls, SD

September 13, 2019Lyon County, Sioux County, Iowa

NWS Sioux Falls, SD issued this river flood warning at Sep 13, 2019, 1:36 AM CDT for Lyon County, Sioux County, Iowa. It took effect at Sep 14, 2019, 1:18 PM CDT. It was in force for 38 hr.

The area

The counties it named.

The facts

Issued: Sep 13, 2019, 1:36 AM CDT (06:36 UTC)
In effect from: Sep 14, 2019, 1:18 PM CDT
Expired: Sep 16, 2019, 3:46 AM CDT
In force: 38 hr
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Flood severity: Moderate

Counties Lyon County, IA, Sioux County, IA

The radar

The Sioux Falls radar (KFSD), 59 km from the middle of the area, began a volume at 06:38 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 Rock River at Rock Valley (RKVI4). The gauge peaked at 16.76 ft at Sep 14, 2019, 11:00 PM CDT.

Action stage: 14 ft
Minor stage: 16 ft
Moderate stage: 17 ft
Major stage: 19 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 06483500, 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 Sioux Falls, SD wrote its last area forecast discussion before this river flood warning went out at Sep 12, 10:51 PM CDT, 2 hours 45 minutes earlier.

Area forecast discussion, Sep 12, 10:51 PM CDT, 2 hours 45 minutes before

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Hazardous weather outlook, Sep 12, 5:56 AM CDT, 19 hours 40 minutes before

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
556 AM CDT Thu Sep 12 2019

IAZ001-012-020-031-MNZ071-072-080-089-097-098-NEZ013-014-SDZ038>040-
050-052>071-131100-
Lyon-Sioux-Plymouth-Woodbury-Lincoln-Murray-Nobles-Pipestone-Rock-
Dixon-Dakota-Beadle-Kingsbury-Brookings-Gregory-Jerauld-Sanborn-
Miner-Lake-Moody-Brule-Aurora-Davison-Hanson-McCook-Minnehaha-
Charles Mix-Douglas-Hutchinson-Turner-Bon Homme-Yankton-Clay-Union-
556 AM CDT Thu Sep 12 2019

This Hazardous Weather Outlook is for northwest Iowa, west central
Iowa, southwest Minnesota, northeast Nebraska, central South
Dakota, east central South Dakota, south central South Dakota and
southeast South Dakota.

.DAY ONE...Today and tonight.

Flooding resulting from heavy rainfall over the past two nights will
be a significant concern. Low-lying and poor drainage areas, as well
as smaller creeks and streams will continue to exhibit flooding
through much of the day. Areal flood warnings are in effect for many
areas.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

IAZ002-003-013-014-021-022-032-MNZ081-090-131100-
Osceola-Dickinson-O'Brien-Clay-Cherokee-Buena Vista-Ida-Cottonwood-
Jackson-
556 AM CDT Thu Sep 12 2019

This Hazardous Weather Outlook is for northwest Iowa, west central
Iowa and southwest Minnesota.

.DAY ONE...Today and tonight.

Scattered thunderstorms will continue to diminish this morning. There
is a small potential that a few stronger storms could redevelop
around lunchtime, mainly east of Highway 59. These storms could
potentially produce some damaging wind to 60 mph, hail to quarter
size and an isolated tornado. However, confidence in development of
these storms is fairly low at this time.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed between 11 pm and 2 pm.

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 13, 10:29 AM CDT	Areal Flood Warning	FSD	Aurora, Bon Homme, Brule, Charles Mix, Davison, Douglas and 4 more	24 hr
Sep 13, 11:43 AM CDT	River Flood Warning	FSD	Union	21 days
Sep 13, 1:13 PM CDT	Areal Flood Warning	FSD	Hanson, Lake, McCook, Miner, Minnehaha, Moody	24 hr
Sep 12, 7:46 PM CDT	River Flood Warning	FSD	Murray	21 days

Nearby

River Flood Warnings in Iowa, 2019 Every river flood warning in 2019

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.