NEW ORLEANS (AP) — A rare frigid storm charged through Texas and the northern Gulf Coast on Tuesday, blanketing New Orleans and Houston with snow that closed highways, grounded nearly all flights and canceled school for more than a million students more accustomed to hurricane dismissals than snow days.

A snowstorm warning was in effect for 31 million people - from southern Texas east through Georgia and north to the Carolinas and into Virginia - until Wednesday morning, the National Weather Service said.

Critical fire weather with wind gusts up to 60 mph (97 kph) was also forecast for Southern California communities stretching to San Diego, with residents urged to take steps to get ready to evacuate such as creating an emergency kit and keeping cars filled with at least a half tank of gas.

A second day of ferocious winds were forecast for Tuesday in Southern California where firefighters remained on alert and extreme fire weather raised the risk of new wildfires two weeks after two major blazes still burning in the Los Angeles area sparked.