4 million people under blizzard warnings

A powerful "bomb cyclone" is whipping the Rockies and Plains for the second time in four weeks, dropping snow that is making travel miserable from Colorado to Minnesota and beyond, delivering a temperature shock to a region that had been enjoying more springlike conditions.

School closures/delays for Wednesday, March 13

Below are the school districts that have reported closures or delays for Wednesday, March 13. If your district is not listed below or here, that means we have not heard of any changes for today.