A winter storm in Texas is causing widespread flight cancellations, particularly in Dallas, a major airline hub.

Another blast of winter storms is closing schools, snarling flights and putting millions of residents on alert across parts of the Deep South and south-central U.S. The storm started dumping a mix of sleet and heavy snow Thursday morning in north Texas and Oklahoma,

Texas refineries are bracing for an onslaught of cold, snow and freezing rain as the US South’s first major winter storm sweeps in during what’s projected to be a frigid month.