Part of: Putnam County Area Flooding — August 2026 →
Flood Warning issued August 24 at 9:45AM CDT until August 28 at 1:00AM CDT by NWS Lincoln IL
This is a severe-significance flood warning event affecting Cass, IL; Fulton, IL; Mason, IL, tracked from official feeds (NOAA / National Weather Service). We update this page as the situation develops.
- Type
- Flood Warning
- Extent
- ≈ 106,333 acres
- Began
- To end
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Affected area map
The shaded area is the affected-area perimeter reported for this event by NOAA / National Weather Service (Cass, IL; Fulton, IL; Mason, IL), colored by hazard type. Pan and zoom to explore the map; when more than one observation exists, use the slider below to step through how the reported area changed.
Interactive affected-area map
Cass, IL; Fulton, IL; Mason, IL · ≈ 170 sq mi reported extent · Enable JavaScript to explore the map.
Shown as reported by our sources — not an official product. For current advisories and the authoritative map, see NOAA / National Weather Service ↗.
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Latest updates
Official updates and news coverage for this event, newest first — National Weather Service products, local storm reports, incident updates and press headlines. Official items are verbatim government text; news headlines link out to the original outlet.
- Forecast discussion NWS ILX
Area Forecast Discussion
Mostly dry weather continues through Tuesday, with showers and storms possible Wednesday that could be strong to marginally severe.
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000 FXUS63 KILX 241040 AFDILX
Area Forecast Discussion National Weather Service Lincoln IL 540 AM CDT Mon Aug 24 2026
.KEY MESSAGES...
- Seasonal and mostly dry weather is expected through Tuesday.
- The next chance for showers and storms arrives Wednesday. Some of these storms could be strong to marginally severe.
&&
.DISCUSSION... Issued at 243 AM CDT Mon Aug 24 2026
Upper analysis has the middle Mississippi Valley positioned under northwest flow with strong upper ridging over the southwest US and a closed low impacting the northeast US. Surface high pressure over central IL early this morning has kept skies mostly clear and winds light. Temperatures as of 2 am have dropped into the upper 50s to low 60s with dewpoint depressions ranging from 0 to a couple degrees. Because of this, patchy low lying fog will be possible through about sunrise. Otherwise, seasonal and mostly dry weather is expected through Tuesday with high temperatures today and tomorrow expected to be in the upper 70s to middle 80s.
By Wednesday, a mid-level shortwave will track through the southern Canadian provinces and into the northern Great Lakes Region, sending a cold front through Illinois. This will…
- News WLFI
Waterspout seen funneling off south shore of Long Island
- Bulletin NWS Lincoln IL
Flood Warning extended until Aug 28, 21:00 UTC
Cass, IL; Fulton, IL; Mason, IL
- Storm report NWS DVN storm report
FLASH FLOOD — Mark, IL
Reports of street flooding at a few locations around the town of Granville.
Show 2 earlier updates
- Kokomo Tribune News
- WLFI News
Updates are captured automatically from official and news sources, and may lag the live source. For the very latest, see NOAA / National Weather Service ↗.