The worst conditions, including hurricane-force winds, flooding rain and possible tornadoes, are set to hit the central U.S. on Friday and Saturday. The barrage of extreme weather is likely to lead to power outages and travel delays on roads and at airports.

Storms that swept through Texas and Oklahoma brought high winds and rain, overturning tractor-trailers and damaging roofs. Power outages were climbing in the storm’s wake, with nearly 400,000 customers without power in Texas, about 30,000 in Louisiana and another 25,000 in Mississippi, according to PowerOutage.us.

Winter isn’t done with us just yet. A powerful storm system is expected to produce severe weather for millions of Americans from coast to coast this week, bringing heavy rain and strong winds to California,