Good morning! Let's talk Monday's storms.

A long-lived, large storm complex tracked from the NE/IA border, across IA, northern IL, & northern IN. This produced widespread damage to trees, toppled several semis, & caused some structure damage.

Recap: https://www.weather.gov/lot/2020aug10 

The peak gusts (measured & estimated) were frequently 70-90 mph & persisted for 15+ minutes with some locations experiencing even higher. These wind speeds are equivalent to EF-0 to EF-1 tornadoes but over a vastly larger area than a tornado would impact. #ILwx

While much of the wind damage was straight-line wind, a few tornadoes were likely embedded within the storm complex across the region, and one has been confirmed in Rogers Park, IL. This did move out over Lake MI becoming a waterspout. #ILwx

Such a complex of storms is called a derecho. A derecho brings a swath of particularly damaging thunderstorm winds over an area at least 400 miles long & 60 miles wide. The Upper Midwest to Great Lakes is a favored climatological area for such storm complexes.

Despite damage coverage/intensity, no fatalities reported & few injuries thus far. This speaks to preparedness & communication by our partners in public safety & the weather enterprise, and sharing info & responding by you the public! Safety: https://www.weather.gov/lot/severeprepare #ILwx #INwx