Central Illinois Sees Wild Weather Swing in One Week

From warm storms to snow, the region experienced a range of conditions.

Apr. 17, 2026 at 8:55pm

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A sweeping, atmospheric landscape painting in muted tones of gray, white, and blue, depicting a vast, snowy prairie scene with a heavy, ominous sky overhead, conceptually representing the unpredictable and overwhelming power of the region's weather.A sudden winter storm sweeps across the central Illinois prairie, underscoring the region's vulnerability to extreme weather shifts.Peoria Today

The Lacon tornado in 1942 was the most recent F5 tornado to hit central Illinois, part of a broader outbreak that impacted multiple states. In just the past week, the region has seen a wild swing in weather, going from warm temperatures and storms to a sudden drop in temperatures and snowfall. While the area avoided the worst of the severe storms, the rain and snow were welcome to help alleviate drought conditions.

Why it matters

Extreme weather swings like this are becoming more common due to climate change, and can have significant impacts on agriculture, infrastructure, and public safety. Understanding the history of severe weather in the region provides important context for preparing communities for future events.

The details

The Lacon tornado in March 1942 was the strongest in a multi-state outbreak, reaching F5 intensity on the Fujita scale. More recently, the Peoria area experienced a dramatic shift in weather over the past week, going from warm temperatures and storms to a sudden drop and snowfall, though the region avoided the worst of the severe weather.

  • The Lacon tornado occurred in March 1942.
  • The recent weather swing in central Illinois happened over the past week.

The players

Lacon tornado

The most recent F5 tornado to hit central Illinois, part of a broader outbreak that impacted multiple states in March 1942.

Peoria area

The region in central Illinois that experienced the dramatic weather swing from warm to cold and snowy conditions over the past week.

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The takeaway

As climate change drives more extreme and unpredictable weather patterns, communities in central Illinois must be prepared to respond to a wider range of severe weather events, from tornadoes to sudden temperature swings, in order to protect public safety and critical infrastructure.