National Weather Service United States Department of Commerce

A Pacific low pressure system drifting across the Northern Tier states...will start a cooler and unsettled weather pattern across the Cowboy State through this weekend. Scattered showers and late day thunderstorms will roam across northern and central Wyoming today...before another low pressure system develops over the Intermountain West on Saturday. This next system will keep showers and scattered thunderstorms over the region Saturday afternoon through Sunday...with areas of locally heavy rain the cold front slides across the state.
Heavy rain and flooding will be possible this weekend from late afternoon Saturday through Sunday.