A huge storm system crossing the U.S. threatens to unleash tornadoes Friday in the Mississippi Valley, blizzards in the northern Plains and dry, gusty conditions in Texas and Oklahoma that pose an extreme risk of wildfires.

A cross-country storm is strengthening as it moves over the central United States Friday and pounding the region with damaging hurricane-force wind gusts that are creating a blinding dust storm and fanning flames amid a “catastrophic” fire risk.