A powerful storm system is producing whiteout conditions in portions of the central United States and nearly 7 million people are under a tornado watch as residents in parts of the Plains remain under a threat for dangerous wildfires.

Tens of millions of people living in the Midwest and central U.S. could be impacted by tornadoes on Wednesday while critical wildfire conditions continue to impact the Southwest, after recent wildfires and a tornado outbreak killed at least 42 people over the weekend.

Another storm system affected millions of people in the middle of the U.S. on Wednesday, leaving parts of the Midwest and Great Plains under blizzard conditions and a broad swath of neighboring states at risk of high winds and wildfires.