A fast-moving tornado tore through the St. Louis area, leaving behind shattered windows, downed trees and three fatalities.

Mid-May is living up to its reputation for severe weather as an active weather pattern brings the threat of strong tornadoes, damaging hail and intense, destructive wind gusts over multiple days.

Track the severe thunderstorm outbreak here using our maps.

The hottest conditions relative to average will shift from out of the south-central states into the Northwest as summer plays out from June through August.

These lake-charged cold fronts are most common in spring and in the past have dropped temperatures dozens of degrees in a single hour.