Flood Warning Issued for Lincoln and Marathon Counties in Wisconsin

Source: NOAA · Lincoln and Marathon Counties, Wisconsin

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The National Weather Service has issued a Flood Warning for Lincoln and Marathon Counties in Wisconsin, with minor flooding expected on the Wisconsin River at Merrill from April 13 to April 16.

What this NWS weather alert tells you, and what most readers miss

This notice was issued by NOAA on April 13, 2026 and geographically references Lincoln and Marathon Counties, Wisconsin. Its severity classification of "high" signals how the issuing agency weighs the risk of harm if no action is taken - "critical" and "high" tier alerts typically carry direct consumer actions, while "medium" and "low" tend toward informational guidance or monitoring advisories. The category it belongs to - Weather Alerts - determines the warning protocol behind it, which shapes what protective action (seeking shelter, following evacuation orders if issued, monitoring official updates) is recommended and which agency holds authority to issue or cancel it.

Most readers skim a notice like this, check whether they are personally affected, and move on. The more useful lens is to read it as a data point about the issuing system: how quickly NOAA detected the hazard, how precise the geographic or product-identifier scope is, and whether similar notices have clustered in the same category or region in the last 90 days. Cluster patterns frequently precede a broader regulatory action, a single localized NWS weather alert is isolated; three of them within a quarter often indicate a supply-chain, infrastructure, or seasonal driver that will keep producing notices until something structural changes.

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Alert Details

A Flood Warning has been issued by the National Weather Service (NWS) Green Bay WI. It is effective starting from April 13, 2026.

Affected Areas

The warning affects Lincoln and Marathon Counties in Wisconsin, specifically the Wisconsin River at Merrill.

What You Should Do

Turn around and do not drown when encountering flooded roads. Motorists should not attempt to drive around barricades or through flooded areas.

Expected Conditions

Minor flooding is forecast, with the river expected to rise to a crest of 11.9 feet. At 11.0 feet, flooding will mainly affect parks and agricultural land in the Merrill area. The current stage is 9.4 feet, and bankfull stage is 10.0 feet.

Timeline

The warning is in effect from this evening on April 13, 2026, until Thursday afternoon on April 16, 2026. It will onset at 6:14 PM CDT on April 13 and end at 12:00 PM CDT on April 16.

Original source: NOAA Official Notice ↗

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Frequently Asked Questions

Common questions about this NWS weather alert.

What is this NWS weather alert about?
The National Weather Service has issued a Flood Warning for Lincoln and Marathon Counties in Wisconsin, with minor flooding expected on the Wisconsin River at Merrill from April 13 to April 16.
Which agency issued this alert?
This alert was issued by NOAA. The original notice is available at the source link at the bottom of this article.
How severe is this alert?
This alert is classified as "high" severity. Take precautions and monitor for updates.
What area is affected?
This alert affects Lincoln and Marathon Counties, Wisconsin. Check with NOAA for the most current geographic scope.
Where can I find more Weather Alerts updates?
Browse the full Weather Alerts feed on Areazine at areazine.com/weather/ for the latest updates from NOAA and other agencies.