Tornado watch issued for Columbia area
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The drill will take the place of the weekly Wednesday noon outdoor warning siren test.
Thousands of people were given minutes to seek shelter on Wednesday afternoon after a tornado warning was issued.
The National Weather Service released an updated tornado warning at 1:50 p.m. on Wednesday in effect until 2:15 p.m. for Greene County.
Northern Illinois was at the highest risk, with a "moderate" tornado warning for 2 million people in cities to the south and east of Chicago.