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Flood Watch Extended Through Late Monday Night for Monona, Harrison, Shelby Counties

The National Weather Service has extended the flood watch for Monona, Harrison, and Shelby counties until 4 a.m. Tuesday.

4 reports on this incident · first at Sep 6, 2026, 12:12 p.m. ET

By AI ReporterWritten Sep 6, 2026, 12:23 p.m. ET
A remains in effect through late Monday night for portions of southwest and west central Iowa, including Monona, Harrison, and Shelby counties, according to an official alert from the National Weather Service in Omaha. The , which was issued at 11:05 a.m. Sunday, September 6, now continues until 4 a.m. Tuesday, September 7. It covers the cities of Logan, Woodbine, Harlan, Mapleton, Missouri Valley, Onawa, and Dunlap. The weather service advises monitoring later forecasts and being prepared to take action should Flash Flood Warnings be issued.

Earlier reports

  1. Sep 6, 2026, 12:21 p.m. ET

    National Weather Service Extends Flood Watch for Monona, Harrison, Shelby Counties Through Late Monday Night

    The National Weather Service in Omaha has issued a Flood Watch for portions of southwest and west central Iowa, in effect from 11:05 a.m. Sunday, September 6, 2026, until 4 a.m. Monday, September 7, 2026. The watch covers Harrison and Shelby counties in southwest Iowa and Monona County in west central Iowa, including the cities of Logan, Woodbine, Harlan, Mapleton, Missouri Valley, Onawa, and Dunlap.

    Flash flooding caused by excessive rainfall is possible. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. The weather service advises monitoring later forecasts and being prepared to take action should Flash Flood Warnings be issued.

  2. Sep 6, 2026, 12:15 p.m. ET

    Flood Watch in Effect Through Late Tonight for Monona, Harrison, Shelby Counties

    The National Weather Service Omaha has issued a Flood Watch for portions of southwest and west central Iowa, in effect from 11:05 a.m. Sunday, September 6, 2026, through 4:00 a.m. Monday, September 7, 2026. The watch covers Harrison and Shelby counties in southwest Iowa and Monona County in west central Iowa, including the cities of Logan, Woodbine, Harlan, Mapleton, Missouri Valley, Onawa, and Dunlap.

    According to the Weather Service, excessive runoff from heavy rainfall may cause flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Residents are advised to monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.

  3. Sep 6, 2026, 12:12 p.m. ETFirst report

    Flood Watch Issued for Harrison, Shelby, and Monona Counties Through Late Tonight

    The National Weather Service in Omaha has issued a Flood Watch for portions of southwest and west central Iowa, effective from 11:05 a.m. on September 6, 2026, through 4:00 a.m. on September 7, 2026. The watch covers Harrison, Shelby, and Monona counties, including the cities of Logan, Woodbine, Harlan, Mapleton, Missouri Valley, Onawa, and Dunlap.

    According to the advisory, flash flooding caused by excessive rainfall is possible. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Residents are advised to monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.

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Revision history

  1. Version 16 Sept 2026, 16:23current

    First published.

  2. Version 16 Sept 2026, 16:15current

    First published.

  3. Version 16 Sept 2026, 16:12current

    First published.

  4. Version 16 Sept 2026, 16:21current

    First published.

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