BILLINGS, Mont. (AP) — Heavy snowfall shut down some schools in Montana and cold temperatures were expected to linger after Thursday's arrival of winter solstice, the shortest day and longest night of the year.

More snow and bitter cold winds were expected across much of the state through Friday, with temperatures in the single digits and colder lingering into next week.

A winter weather advisory was in effect for communities including Great Falls, Helena, Missoula and Bozeman.

Some flights were delayed and others cancelled at the airport in Bozeman and schools in areas of southeastern Montana were closed Thursday.

In northwestern Montana, Flathead Electric Co-op says it is delaying planned maintenance work in the Libby area that would have involved an outage for almost 1,400 customers. The utility says it will be rescheduled for a more appropriate time.