Flash Flood in McDonough County, Illinois
Flash Flood June 17, 2026 · McDonough County, Illinois
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
A trained spotter reported that ditches are full, creeks out of their banks between Colchester and Adair across the south central portion of the county with 3 to 5 inches of water on many of the back roads.
The wider storm
A strong storm system for mid-June brought two rounds of thunderstorm on Wednesday June 17th. The strongest round of storms occurred during the morning hours that brough damaging winds (some significant), heavy rain, and two EF-1 tornadoes in Illinois which occurred in Monmouth and Warsaw.
Many trees fell and power lines were damaged, along with several reports of flash flooding. There were also 4-5 train cars that were pushed off the railroad just south of Monmouth, IL in Warren County due to significant straight-line winds (estimated near 100 mph). Additional train cars derailed as a result of these cars being blown off.
Began near Colchester (40.4200, -90.7900).
Other tornadoes from the same storm system
2 more tornadoes the National Weather Service filed under this storm episode.
Source: NOAA Storm Events Database, event 1337549. Narratives are written by the National Weather Service forecast office that issued the report.
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