A significant weekend system will bring a stark end to recent warm conditions across the Northern Rockies on June 27-28. 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.