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Central Illinois Decision Support Briefing - June 18, 2026

National Weather Service Lincoln, IL Decision Support Briefing for June 18, 2026, covering excessive rainfall and river flooding risks for central and southeast Illinois.

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Central Illinois

Summary: The NWS Lincoln, IL, issued a decision support briefing on June 18, 2026, warning of excessive rainfall and river flooding across central and southeast Illinois through the weekend.

This decision support briefing from the National Weather Service in Lincoln, IL, dated June 18, 2026, highlights significant weather risks for central and southeast Illinois. Key concerns include excessive rainfall and river flooding affecting the Illinois, Sangamon, Spoon, La Moine, and Wabash Rivers. Moderate flooding is expected at Havana and Beardstown. Thunderstorms are forecast to return late Saturday night and persist through Sunday night, with potential for flash flooding in urban and low-lying areas. While severe weather is not currently expected, the cumulative effect of training storms increases the risk of localized flooding.

Document outline

1. Bottom Line Up Front 2. Forecast Highlights 3. Weather Hazards at a Glance (June 18-24, 2026) 4. Latest Weather Headlines 5. Excessive Rainfall Outlook: Day 3 (Saturday Night) 6. Excessive Rainfall Outlook: Day 4 (Sunday and Sunday Night) 7. 7-Day Precipitation Outlook 8. River Observations and Forecasts 9. Extended Hazard Outlooks 10. 8 to 14 Day Temperature and Precipitation Outlooks 11. Resources

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7 days: 5,057

Technical metadata

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Title06.18.2026 4.08 AM CDT - Weather Briefing
AuthorU.S. National Weather Service - Lincoln, IL
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Title: 06.18.2026 4.08 AM CDT - Weather Briefing