What tornado hit Chicago?
Chicago's deadliest tornado was an F4 on April 21, 1967, killing 33; the most recent was an EF-2 on August 11, 2026.
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Can a severe thunderstorm warning cause a tornado?
A severe thunderstorm warning alerts to damaging winds and hail, but does not cause tornadoes; tornado warnings are issued separately when a tornado is detected.
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When are severe weather watch bulletins issued?
Severe weather watch bulletins are issued 36 - 48 hours ahead when conditions favor severe weather, alerting the public to prepare.
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