Weather

By Thursday morning, Day says arctic air will have spread to the south into central and east-central areas of Wyoming.

Hundreds of public schools and several large universities from North Dakota to Pennsylvania canceled classes Tuesday or planned to do so Wednesday.

Light snow is expected to develop over northern Wyoming, including I-90, during the day Wednesday.

An actual temperature in one Wyoming town was recorded at near 40 below zero.

The service says frostbite and hypothermia could develop quickly under these conditions.

Windchills could reach -30 in the Sierra Madre and Snowy Range mountains.

Don Day says mild winter temperatures generally were the rule last winter, but that won't be the case this winter.

Those traveling in light, high-profile vehicles should be prepared to encounter these strong winds and adjust or cancel plans accordingly.