For the latest road conditions, call 5 1 1. Persons should consider delaying travel through the warned area. If travel is absolutely necessary, drive with extreme caution. Consider taking a winter storm kit along with you, including such items as tire chains, booster cables, flashlight, shovel, blankets and extra clothing. Also take water, a first aid kit, and anything else that would help you survive in case you become stranded.

* WHAT...Heavy snow. Additional snow accumulations of 3 to 6 inches. Winds gusting as high as 40 mph creating areas of blowing and drifting snow. * WHERE...In Montana, Pryor/Northern Bighorn Mountains. In Wyoming, Northeast Bighorn Mountains. * WHEN...Until 6 AM MDT Thursday. * IMPACTS...The heaviest snow is expected through mid evening, with snowfall diminishing late tonight. Heavy wet snow and gusty winds may cause tree and power line damage resulting in power outages. Recreation in the high country will be impacted by heavy accumulating snow and blowing snow at times. Travel could be very difficult to impossible on Highway 14 over the Bighorn mountains. * ADDITIONAL DETAILS...Expect avalanche danger to increase. If you are heading to the high country be prepared for dangerous winter conditions. Be sure to let someone know your plans in case you become stranded.