Winter storm moving across nation

A large and unsettled weather pattern is changing the weather across much of the nation this weekend.

In the west, a powerful winter storm is slamming the west coast with heavy rain and mountain snow. That snow is spreading into the Rockies.

Meanwhile, a blast of cold Canadian air is settling across the northern tier of the nation with winter storm and blizzard conditions from eastern Wyoming and Montana all the way to the Great Lakes states.

As we head into the last of February and the first of March - and the cold air moves south - it could trigger the first severe weather outbreak of the season in the southern states.