Flood Warning Issued for Crawford and Lawrence Counties in Illinois and Knox and Sullivan Counties in Indiana
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The National Weather Service has issued a Flood Warning for Crawford and Lawrence counties in Illinois and Knox and Sullivan counties in Indiana, with minor flooding expected on the Wabash River starting Tuesday evening and lasting until May 6.
What this NWS weather alert tells you, and what most readers miss
This notice was issued by NOAA on May 14, 2026 and geographically references Southeastern Illinois and Southwestern Indiana. 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) Indianapolis IN. This alert is for the event code FLW and is effective from April 28, 2026, at 6:40 PM EDT until May 6, 2026, at 8:00 AM EDT.
Affected Areas
The warning affects Crawford, IL; Lawrence, IL; Knox, IN; and Sullivan, IN, specifically impacting the Wabash River at Riverton.
What You Should Do
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding.
Expected Conditions
Minor flooding is forecast, with the river stage at 9.0 feet expected to rise above the flood stage of 15.0 feet to a crest of 17.6 feet on May 4, 2026. At 18.0 feet, extensive lowland flooding occurs, affecting river cabins and parks, though the forecast peak is below this level.
Timeline
The alert onset is April 28, 2026, at 6:40 PM EDT. It is expected to end on May 6, 2026, at 8:00 AM EDT, with the river forecasted to fall below flood stage on May 5, 2026.
Original source: NOAA Official Notice ↗
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