The first of this week’s back-to-back-to-back winter storms is dumping snow, ice and rain over a 1,500 mile stretch of the eastern US Tuesday. The second winter storm will hit some of the same areas in quick succession and dump the most substantial snow of the season over Chicago.

More than 100 million people are under winter alerts stretching from Colorado to Maine. Multiple winter storms are bringing heavy snow, cold temperatures and dangerous conditions. The Virginia Department of Transportation has thousands of salt trucks ready to go.