⚠️ Flash Flood Warning – Lyon, IA; Osceola, IA; Nobles, MN – Sunday, September 6, 2026

Flash Flood Warning issued September 6 at 11:58AM CDT until September 6 at 4:00PM CDT by NWS Sioux Falls SD

Details

FFWFSD

The National Weather Service in Sioux Falls has issued a

* Flash Flood Warning for…
Northeastern Lyon County in northwestern Iowa…
Northwestern Osceola County in northwestern Iowa…
Southern Nobles County in southwestern Minnesota…

* Until 400 PM CDT.

* At 1158 AM CDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
1 and 3 inches of rain have fallen. The expected rainfall rate is
1.5 to 3 inches in 1 hour. Additional rainfall amounts of 2 to 4
inches are possible in the warned area. Flash flooding is ongoing
or expected to begin shortly.

HAZARD…Flash flooding caused by thunderstorms.

SOURCE…Radar and automated gauges.

IMPACT…Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.

* Some locations that will experience flash flooding include…
Worthington, Ellsworth, Little Rock, Rushmore and Bigelow.

Low lying portions of Interstate 90 near and west of Worthington
could see standing water.

Instructions

Turn around, don’t drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be aware of your surroundings and do not drive on flooded roads.

Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.

Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.

This alert was automatically posted by SkyGuard, MWSC’s severe weather alerting system. Source: National Weather Service.