Illinois Summer Weather Alert: Damaging Winds and Thunderstorms Possible Wednesday Afternoon — Risk Focused Near I-70 Corridor

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Champaign, Illinois – High heat and potentially severe storms will clash over central Illinois on Wednesday, July 30, creating hazardous conditions from mid-afternoon into the evening.

According to the National Weather Service in Lincoln, a heat advisory remains in effect through 8 p.m. Wednesday, with heat index values soaring to 105°F in areas south of I-70, including Champaign. A round of strong to severe thunderstorms is expected to fire up after 1 p.m., with damaging wind gusts and heavy rainfall being the main threats.

Localized power outages and dangerous driving conditions are possible, particularly along I-70 and U.S. Route 45. Residents are urged to limit outdoor activity, stay hydrated, and prepare for fast-changing weather. Spotter activation may be needed later today.

Wednesday night brings a 60% chance of showers and thunderstorms, especially after sunset, with gusty north winds reaching 20 mph. Rainfall totals could exceed three-quarters of an inch.


🌤️ Extended Five-Day Forecast for Champaign, IL

  • Wednesday, July 30: High near 90°F, storms likely after 1 p.m., heat index up to 105°F
  • Thursday, July 31: Showers possible before 1 p.m., breezy and cooler, high of 76°F
  • Friday, August 1: Sunny and mild, high of 87°F, perfect for outdoor plans
  • Saturday, August 2: Mostly sunny, high near 79°F — cool for early August
  • Sunday, August 3 – Monday, August 4: Dry and sunny, highs in low 80s — ideal summer weather

⚠️ Warnings remain in effect through 8 p.m. Wednesday. More advisories may be issued if storm conditions worsen.