A snowstorm is dropping travel-disrupting snow across the Rockies, including in some major cities. A brutally cold air mass is plunging southward from Canada behind this storm.
A powerful storm storm system that originated from the Pacific is moving across the Rockies, dumping the heaviest snow on its back edge. It will emerge into the Plains by early Monday morning, spreading treacherous snow and ice with it.
Snow will fall from Montana to northern Arizona through tonight with the heaviest amounts expected in the Wasatch Range of Utah, the Colorado Rockies and the mountains in southern Wyoming. Around half a foot of snow will thump over these areas with locally higher amounts in the highest elevations.
Salt Lake City and Flagstaff are already getting blasted by snow that has been reducing the visibility to as low as a quarter of a mile. With temperatures in the 20s on Sunday in both of these cities and even colder temperatures in the higher elevations, it has been a very powdery snow.
A golden retriever named Ava watches his owner Kass Jones of Crested Butte, Colo., as he throws snow from a shovel over her head on Wednesday, Nov. 24, 2010, from a fierce snowstorm with high-intensity winds and snow that left Colorado with substantial amounts in the southern portions of the state. (AP Photo/Nathan Bilow)
Salt Lake City is expected to get covered by a fresh 4-8 inches through tonight, while Flagstaff will be buried by 2-4 inches of snow.
The snow will arrive in Denver tonight into Monday morning, and a coating to an inch or two will be dropped in the Mile High City.
Meanwhile, temperatures will plummet even more tonight, dropping into the single digits across the northern Rockies and the teens through the central and southern Rockies. Locally strong winds developing behind the storm will make AccuWeather.com RealFeel® temperatures even colder than actual temperatures.
Travel will be extremely dangerous through Monday morning across portions of I-15, I-25, I-40, I-70, I-80, I-90, and I-94 with leftover snow and the bitterly cold air spilling southward. These major roads and especially secondary roads of the region will be icy and snow-packed, while snow will dangerously reduce the visibility.
Roads turned into rivers in parts of the mid-Atlantic on Saturday due to flooding downpours.
Rounds of drenching showers and heavy thunderstorms will heighten the risk of flash flooding across the northeastern United States through the final weekend of July.
After unloading flooding rain across the Philippines into Monday, Typhoon Nida will take aim at China early this week.
Typhoon Nida threatens to bring flooding rain to the Philippines this weekend with future impacts on China and Taiwan.
A tropical wave approaching the Caribbean Sea will attempt to reactivate the Atlantic Basin during the first week of August.
As several large fires continue to rage across the western United States, weather conditions will gradually improve for firefighting efforts this week.
Estes Park, CO (1976)
Big Thompson River flood disaster; up to 10" of thunderstorm rains funneled into narrow canyon near Estes Park. 139 drowned, 5 missing, $35.5 million estimated damage.
1,178 "reported" tornadoes with 120 killed so far this year. Number of "actual" tornadoes probably less, but this is still one of the most active years ever (nearly half of the fatalities occurred in the Carolina outbreak of March 28th).
Los Angeles, CA (1991)
New July rainfall record of 0.17" established. The previous record was 0.15" set in July 1969.