San Cristobal de las Casas, Mexico

At a Glance Hundreds of flights are canceled Friday at Chicago O'Hare International Airport.Some Georgia school districts announced closures, including in the Atlanta area.NFL wild card games in Kansas City, Buffalo and Tampa all face weather worries. Sign up for the Morning Brief email newsletterto get weekday updates from The Weather Channel and our meteorologists. H​undreds of flights are already canceled in Chicago, schools are closing in the Atlanta area and tornadoes and high winds are possible for parts of...