Why sirens kept going off after Franklin County's tornado warning was over

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COLUMBUS, Ohio (WCMH) -- As a tornado warning for Franklin County ended last night, sirens warning residents continued to blare in certain areas around Columbus.

Multiple central Ohio counties, including Franklin, Delaware and Licking, went under tornado warnings over the course of the evening. As of Wednesday afternoon, the National Weather Service had confirmed four tornadoes in three Ohio counties, but none that touched down near the Columbus metro.