This severe weather outbreak could easily be the worst of the entire season.It is being triggered by two very different air masses that are slammingagainst each other.

Already powerful thunderstorms with hail and high winds are hammering theMidwest, and this area will continue to experience hostile moments of weatheron Friday. This is not a pattern that favors many tornadoes, but some willoccur, and those that do could be very violent.

Story by AccuWeather.com Expert Senior Meteorologist John Kocet.