Full Breakdown
Severe Flooding in Lake and McHenry Counties Following Thunderstorms
4/19/2026, 1:31:10 PM
Overview of the Severe Weather Events
Lake and McHenry counties in Illinois experienced significant flooding due to severe thunderstorms that struck the region three times within a week. The latest round of storms began on Friday evening, April 17, 2026, with heavy rainfall and tornado warnings issued for both counties. The storms entered McHenry County around 7:30 p.m. and Lake County shortly after at 8 p.m. Reports indicated radar-indicated rotation, particularly affecting areas such as Harvard, Alden, and Wonder Lake.
Impact on Local Communities
The storms resulted in major flooding, particularly along the Fox River and Des Plaines River. In Algonquin, officials reported that the Fox River reached 11.18 feet and was expected to crest at 11.8 feet by the morning of April 22. The village distributed sandbags in various locations to mitigate flooding risks. Additionally, the Chain O’Lakes was closed to boaters due to rising water levels, which were anticipated to reach moderate to major flood levels.
In Gurnee, flooding was exacerbated by the area's low elevation and proximity to the Des Plaines River. Key roads, including Old Grand Avenue and Kilbourne Road, were closed due to water accumulation. Reports indicated that nearly two inches of rain fell in some areas, contributing to already saturated ground conditions.
Official Statements & Responses
Lake County officials noted that water levels along the Des Plaines River are expected to peak between Saturday and Sunday before gradually receding. They emphasized the importance of public safety, advising residents to avoid driving through flooded roadways. “Never drive through flooded roadways. Turn around, don’t drown,” officials warned. They also acknowledged that while clearer weather is anticipated next week, flooding could still occur in areas where rainfall exceeds the ground’s absorption capacity.
Criticism & Opposition
Some residents expressed concern over the preparedness of local authorities in managing flood risks. A resident from Lincolnshire recalled previous flooding incidents, stating, “The last time it flooded it was 2017... all these roads were underwater.” This sentiment reflects a broader anxiety among communities that have faced similar weather challenges in the past.
Conflicting Reports & Gaps
While many reports confirmed the severity of flooding and the impact on local infrastructure, there remains uncertainty regarding whether tornadoes touched down in McHenry County, as the National Weather Service has yet to confirm such incidents. Additionally, discrepancies exist regarding the exact peak water levels expected along the rivers, with varying predictions from local officials.
What's Next
As the situation develops, local authorities will continue to monitor river levels and provide updates to residents. Emergency services are prepared to respond to any additional flooding incidents, and sandbags will remain available for those in flood-prone areas. Residents are advised to stay alert as conditions may change with further rainfall expected in the coming days.
