‘Once in a lifetime’ winter storm brings heavy snow and chill to southern US

New Orleans and Houston see record snow leading to closed highways and canceled schools

A once in a lifetime" winter storm sweeping through the southern United States on Tuesday dumped snow at levels millions of residents had never seen before.

The storm blanketed New Orleans and Houston with record 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.