Flash Flood Warning Issued for Boone and Winnebago Counties in Illinois
This alert is no longer in effect.
NOAA issued it on April 16, 2026, 4 months ago. Warnings of this kind stay in effect for hours to a few days, so this page is a historical record of what was issued, not a current warning. For conditions where you are right now, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia).
Areazine synthesizes this NWS weather alert directly from NOAA's official public data feed. See our methodology for full source attribution and refresh cadence.
The National Weather Service has issued a Flash Flood Warning for Boone and Winnebago Counties in Illinois, effective until 2:30 AM CDT on April 16, 2026, due to heavy rain causing rapid-onset flooding.
Read this weather record in 30 seconds
- Record type
- Flash Flood Warning
- Affected area
- Northern Illinois
- Issued
- April 16, 2026
- Issuing authority
- NWS Chicago IL
Flood notices turn on location and timing. Treat the named area as this record's scope; do not assume nearby counties, parishes, or waterways were included.
Record status: historical. It was issued 4 months ago; use the issuing agency's live warning service for current conditions in Northern Illinois.
Flash Flood Warning in Northern Illinois
Alert Details
A Flash Flood Warning has been issued by the National Weather Service in Chicago for the specified areas. It is effective from 8:27 PM CDT on April 15, 2026, until 2:30 AM CDT on April 16, 2026.
Affected Areas
The warning affects Boone County in north central Illinois and Winnebago County in north central Illinois. Specific locations include Rockford, Belvidere, Loves Park, Machesney Park, Roscoe, South Beloit, Rockton, Poplar Grove, Rockford Airport, Candlewick Lake, Cherry Valley, Winnebago, Davis Junction, Pecatonica, Lake Summerset, Durand, Capron, Timberlane, New Milford, and Garden Prairie.
What You Should Do
Persons along creeks, drainage ditches, and other waterways should take immediate precautions to protect life and property. Avoid areas prone to flooding.
Expected Conditions
Doppler radar indicates thunderstorms producing heavy rain with a rainfall rate of 1 to 2 inches in 1 hour. Additional rainfall amounts of 1 to 2 inches are possible in the warned area. Portions of the area have already received between 2 and 3.5 inches of rain.
Timeline
The alert is effective from 8:27 PM CDT on April 15, 2026, and ends at 2:30 AM CDT on April 16, 2026.
Original source: NOAA Official Notice ↗
Related Weather Alerts
All Weather Alerts →Nationwide notices with similar length or severity timing 8
Two Areazine-derived peer sets for this NWS weather alert: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,248 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to April 16, 2026.
Frequently Asked Questions
Common questions about this NWS weather alert.