Flood Warning Issued for Washington and Marshall Counties in Kansas
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A Flood Warning is in effect for Washington and Marshall Counties in Kansas due to expected moderate flooding on several rivers, with conditions starting late on April 11, 2026.
What this NWS weather alert tells you, and what most readers miss
This notice was issued by NOAA on April 11, 2026 and geographically references Washington and Marshall Counties, Kansas. 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) Topeka KS. It is effective starting April 11, 2026, at 7:32 AM CDT.
Affected Areas
The warning affects Washington County and Marshall County in Kansas. Specific areas include Mill Creek at Washington, Big Blue River near Blue Rapids, Black Vermillion River near Frankfort, and Little Blue River near Barnes.
What You Should Do
Motorists should not attempt to drive around barricades or drive cars through flooded areas to ensure safety.
Expected Conditions
Moderate flooding is forecast, with the Mill Creek at Washington currently at 14.3 feet and expected to rise above the flood stage of 18.0 feet to a crest of 22.2 feet this evening. At 19.0 feet, Osage Road, located 2 miles west and 1 mile north of Washington, will flood.
Timeline
The warning is effective from April 11, 2026, at 7:32 AM CDT, with onset at 9:42 AM CDT on the same day. It expires on April 11, 2026, at 10:45 PM CDT and ends on April 12, 2026, at 9:44 PM CDT.
Original source: NOAA Official Notice ↗
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