Winter Storm “Q,” which has already dumped a layer of snow in Arizona, New Mexico and Southern California, moves with full force into the eastern Plains and Midwest on Thursday, where it could dump a foot and a half of snow in some areas.

In Kansas and Missouri, where forecasters are predicting the heaviest snowfall, flights at Kansas City International Airport have been canceled and several schools districts, as well as Kansas State University, have canceled classes.

The National Weather Service has issued a Winter Storm Warning for most of Nebraska and Iowa, all of Kansas and nearly all of Missouri. Advisories are posted for parts of South Dakota, Minnesota, Illinois, Indiana, Ohio, Kentucky, West Virginia and Virginia, Colorado, New Mexico, Oklahoma, northern Texas and Arkansas.