Preliminary Damage Survey Results from Sunday’s Lake County, IL Tornado Indicates Maximum at EF-1 Intensity

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The NWS Chicago survey team that is investigating tornado damage in Lake County, Illinois from the severe thunderstorms on Sunday evening has some preliminary findings from the Round Lake to Hainesville and Grayslake area. The tornado touched down near Round Lake and produced damage of maximum EF-1 intensity along its path into Grayslake, with estimated wind speeds up to 90 to 100 mph.

The team will continue to investigate additional damage in Lake County this afternoon and will provide updates on these findings. Information including path length and width and start end time(s) are expected.

EF Scale: the Enhanced Fujita Scale classifies tornadoes into the following categories:
EF0: Weak: 65 to 85 mph
EF1: Weak: 86 to 110 mph
EF2: Strong: 111 to 135 mph
EF3: Strong: 136 to 165 mph
EF4: Violent: 166 to 200 mph
EF5: Violent: > 200 mph

Passing Lake County Thunderstorm with Tornado viewed from Arlington Heights …

Lake County Illinois lightning during tornado and severe thunderstorm as viewed from Arlington Heights. Lightning was continuous as the storm, which was a moderate band about the length of Lake County north-to-south, moved east to Lake Michigan.






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