A significant weekend system will bring a stark end to recent warm conditions across the Northern Rockies on June 27-29. Steady precipitation will develop by Saturday and could continue all the way through Monday. Some locations could receive several inches of rain below 6000 feet. Above 6000 feet, mountains from the Clearwater, Bitterroot, Sapphire, Flint Creek, Anaconda, Bob Marshall, and mountains within Glacier National Park could receive multiple inches of snowfall. Also it will be "winter-like" in the mountains with cold and wet conditions which could pose hypothermia risk for those not prepared. Heavy snow in backcountry roads could cause tree-fall and those planning on going on there should have an emergency kit with them including a chainsaw or saw, warm gear and waterproof coats and jackets. Some high mountain locations could received 2 to 12 inches of heavy wet snow. Expect widespread rain across the valleys with highs dropping into the 50s and 60s. Above 6,000-7,000 feet, conditions will turn decidedly winter-like with accumulating snow and highs struggling to escape the 30s and 40s. Backcountry recreationists should prepare for an increased risk of hypothermia and raw, wintry conditions.