Weather whiplash to sweep U.S. with simultaneous blizzard, polar vortex, and heat dome

Nearly every part of the United States is getting walloped by wild weather or just about to be.

Days of downpours have begun in Hawaii. The Southwest will soon bake with day after day of record 100-degree-plus (38 Celsius-plus) heat. Two storms will dump snow by the foot over northern Great Lakes states. And the dreaded polar vortex will again invade the Midwest and East with soul-crushing Arctic chill.

This forecast of extremes comes as weather whiplash already hit much of the East.