Suburbs south and west of Chicago were under a Level 1 risk of severe storms, and much of the same area was under a 2% risk for tornadoes, ABC7 Chicago meteorologist Larry Mowry said.
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Storms were possible between 4 and 10 p.m., Mowry said.
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There was concern for large hail and gusty winds, but a brief tornado touchdown cannot be ruled out.
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There will be additional waves of showers and storms overnight and again on Wednesday.
Some pockets of heavy rain will be possible Wednesday.
Flash flooding slowed down traffic along the Dan Ryan Expressway earlier Tuesday.