A strong Pacific storm will drift over southern California and into Arizona today and Saturday, then move to New Mexico Sunday. Heavy snowfall is expected across the San Juan Mountains and the lower elevations of the Four Corners today through the weekend. Snow will spread across the central valleys this morning, changing to rain this afternoon, then back to snow tonight. Travel through the mountain passes will be hazardous due to snowpacked and icy roads and reduced visibility in snowfall. (Please visit http://weather.gov/gjt for more information.)