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2 confirmed tornadoes struck within Monday’s derecho

ROCKFORD (WREX) — On top of the damage caused by Monday's derecho, the National Weather Service office in Chicago confirmed 2 tornadoes struck Rockford. The damage is consistent with EF-0 to EF-1 strength.

Southwest Rockford:

The first tornado hit at 2:37 pm near Ogilby Road and Pierpont Avenue. The tornado traveled 1.5 miles to the northeast and ended near Morgan Street. Damage was done primarily to trees. The tornado is on the weakest end of the scale as an EF-0, but still produced winds up to 75 mph within a 50 yard span.

The same supercell thunderstorm that produced this tornado spawned a second and stronger tornado several minutes later.

Northeast Rockford and Loves Park:

A stronger tornado formed near Aldeen Park and moved northeast toward Rock Valley College. Significant tree damage occurred around RVC as the tornado hit EF-1 strength. Winds were rated at around 100 mph at peak strength. The tornado created sporadic damage after that as it moved north into Loves Park and crossed I-39. The tornado ended near Caledonia.

Overall, the tornado traveled 9.2 miles and was 300 yards wide.

Severe day:

Total for August 10th tornadoes, so far.

So far, 7 tornadoes are confirmed by the National Weather Service in Illinois: 2 in Rockford, 1 near Marengo, 1 near Lombard, 1 near Wheaton, 1 near Spring Grove, IL that traveled into Wisconsin, and the last in the Rogers Park neighborhood on the north side of Chicago. A tornado was also confirmed near Lake Geneva.

The National Weather Service continues to investigate additional areas of potential tornado damage.

The remainder of the damage is likely from the straight-line winds of the derecho. Remember, severe thunderstorms seen within the derecho can be just as damaging as tornadoes. Wind gusts exceeded 58 mph Monday, with a few reports of 90-100 mph wind gusts around Iowa and Illinois. This is on par with an EF-1 tornado. Forreston is an example of how powerful the straight-line winds can be.

We will pass along any other confirmed tornadoes from the National Weather Service. Remember- anytime you get a warning about severe weather, take action and get to shelter immediately.

Alex Kirchner

Alex Kirchner is the Chief Meteorologist at 13 WREX. He joined the 13 Weather Authority in 2014 and brings over a decade of forecasting experience to the weather department. Alex earned Certified Broadcast Meteorologist recognition from the American Meteorological Society, and his work at WREX earned him a Best TV Weathercaster award from the Illinois Broadcasters Association and a regional Emmy.

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