A fast-moving line of severe thunderstorms slammed into northwest Cook County on Wednesday evening, blasting suburbs with quarter-size hail and violent wind gusts that tossed branches and debris across neighborhood streets. Emergency officials and trained spotters clocked damaging winds near 70 mph in communities such as Bartlett as the storm rocketed southeast out of Wisconsin toward the city.
Warnings and Timing
The National Weather Service issued a severe thunderstorm warning for northwest Cook County that was set to expire at 7:15 p.m., while an earlier tornado warning for parts of northeastern Kane and northwestern Cook counties was allowed to lapse around 6:45 p.m., as reported by the Chicago Sun‑Times. The Sun‑Times noted that the storms, racing southeast into the metro area, carried the potential for damaging straight-line winds and large hail.
Storm Reports Recorded by the Weather Service
Preliminary local storm reports from the National Weather Service included a 1.00-inch hail report southeast of Algonquin at 5:59 p.m., along with several other spotter observations, according to NWS Chicago. Those real-time reports from trained spotters and the public help forecasters verify what radar is seeing and adjust warnings on the fly.
Watch Area and Main Threats
Forecasters maintained a severe-thunderstorm watch over a broad stretch of northeastern Illinois, including Cook, DuPage, Kane, Lake and McHenry counties, through about 10 p.m., with damaging winds and hail flagged as the primary hazards and an isolated tornado still on the table, according to NBC Chicago. Local meteorologists cautioned that fast-moving clusters of storms could deliver brief but intense bursts of wind strong enough to snap large branches and knock out power.
Impacts on the Ground and Safety Tips
Early video and photos from the northwest suburbs showed snapped limbs and blocked roads, a familiar scene when gusts approach 70 mph. With that kind of wind, fallen trees and damaged power lines quickly jump to the top of the concern list. The National Weather Service urges residents to head indoors away from windows, steer clear of any downed wires and review its severe thunderstorm safety guidance, as outlined by NWS Thunderstorm Safety.
What To Expect Next
The line of storms is expected to continue sliding east overnight, and forecasters say heat and humidity are likely to build again later in the weekend, a shift NBC Chicago highlighted in its coverage. Officials advise residents to keep phones set to receive Wireless Emergency Alerts and to monitor official channels for the latest information on power outages, road closures and cleanup efforts as storms move out and conditions shift.
