* WHAT...Southwest winds 35 to 45 mph, with gusts up to 65 mph expected. * WHERE...Cascade County, including the Little Belt and Highwood Mountains, Judith Basin County and Judith Gap, Upper Blackfoot and MacDonald Pass, Gates of the Mountains, Helena Valley, and Big Belt, Bridger and Castle Mountains. * WHEN...From midnight tonight to 11 AM MST Friday. * IMPACTS...High winds may move loose debris, damage property and cause power outages. Travel could be difficult, especially for high profile vehicles.