Residents in Eastern Utah and Western Colorado woke up Monday morning to hazy and smokey skies. Satellite Imagery, below, showed the smoke plume was stretched from Central Nevada through Central Utah and into Western Colorado. Streamline analysis over a layer from about 10,000 to 18,000 feet MSL (actually the 700 to 500 hPa constant pressure surface) showed that this layer air was arriving from Southern California. So most of the regional smoke is most likely from the California fires. Locally, the wilfire near Nucla Colorado may have produced some of the smoke, along with wildfires in Southwestern Utah.