Flood Warning Issued for Allen and De Kalb Counties in Indiana and Defiance County in Ohio

Source: NOAA · Northeastern Indiana and Northwestern Ohio

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A Flood Warning has been issued by NWS Northern Indiana for parts of Indiana and Ohio, with moderate flooding expected on the Saint Joseph River starting Thursday evening.

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

This notice was issued by NOAA on April 23, 2026 and geographically references Northeastern Indiana and Northwestern Ohio. 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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Flood Warning in Northeastern Indiana and Northwestern Ohio

Alert Details

The alert is a Flood Warning, issued by NWS Northern Indiana under NOAA. It is effective from 2026-04-16T20:00:00-04:00 EDT until further notice.

Affected Areas

The warning affects Allen County, IN; De Kalb County, IN; and Defiance County, OH. It also involves the Saint Joseph River Ohio near Newville.

What You Should Do

Turn around, don't drown when encountering flooded roads. Do not attempt to drive around barricades or through flooded areas. Exercise caution when walking near riverbanks. Detailed river forecasts and additional information can be found at www.weather.gov/iwx under Rivers and Lakes.

Expected Conditions

Moderate flooding is forecast for the Saint Joseph River Ohio near Newville. The river is expected to rise to a crest of 14.5 feet early Sunday morning, with the flood stage at 12.0 feet. At 10:35 AM EDT Wednesday, the stage was 7.6 feet.

Timeline

The warning is effective from 2026-04-16T20:00:00-04:00 EDT (Thursday evening) and will continue until further notice.

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?
A Flood Warning has been issued by NWS Northern Indiana for parts of Indiana and Ohio, with moderate flooding expected on the Saint Joseph River starting Thursday evening.
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 Northeastern Indiana and Northwestern Ohio. 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.