What’s causing a multi-day outbreak of deadly tornadoes across the U.S.

From PBS NewsHour.

A second round of violent weather is barreling across the central and southern U.S. after a deadly and destructive Friday night. The storms have spawned tornadoes and fanned wildfires and dust storms that claimed at least 17 lives. John Yang speaks with Matthew Cappucci, senior meteorologist at MyRadar, who is in Mississippi tracking the storms.

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