NWS confirms 'multiple' tornadoes in Northeast Illinois: Where in Chicago did they touch down, and how many were there?
Although an exact estimate as to the number and exact locations of the twisters has yet to be confirmed, damage from Wednesday's severe weather remains clear.
The threat of severe weather, including tornadoes and flash flooding, is rising on Wednesday afternoon, according to the National Weather Service. According to the NBC 5 Storm Team, the specific weather phenomenon that caused 'multiple' tornadoes to touch down is known as an""Those boundaries are the leading edge of cool surface-level winds that result from the downdrafts of thunderstorms, like the ones that formed early in the afternoon on Wednesday in the Chicago area," NBC 5 Meteorologist Brant Miller said."Those cool winds race towards the ground, and can spread out far beyond where they originated from.
Additionally,"new thunderstorms can often form in these areas, and if they run into the outflow boundary, the low-level wind shear can cause thunderstorms to exhibit rotation, and that’s when tornadoes can form," Miller said.A tornado forms when rising warm air and sinking cool air cause spinning air currents inside a cloud, the NBC 5 Storm Team says. That rotation then turns from horizontal to vertical orientation, then descends to the ground, and a tornado forms.
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