Most mountain ski areas should experience a decent winter based on what is expected when La Niña conditions are present. Of course there can be instances where we have a more southerly tracking storm but that should be the anomaly this upcoming season. This is the ‘typical’ setup of what generally happens. This track will bring active weather into the central and northern Rockies, through the Great Lakes region and into the Northeastern US. Due to this, the storm track will allow for weather systems to track into British Columbia and the Pacific Northwest. Normally, high pressure will set up off the west coast of North America. Since we are anticipating La Niña conditions, we’ll focus on the right side of this image. We have been in an ENSO-Neutral phase recently which is defined by the surface water temperatures in the equatorial Pacific ocean running near normal compared to long-term average.ĭepending on which phase of ENSO (El Niño Southern Oscillation) we are in, it has big implications of what the upcoming winter will be like.įirst off, what happens during each ENSO phase? Portland and Multnomah county earlier declared states of emergency.A La Niña Watch has been issued because conditions are favorable for the development of La Niña conditions within the next 4 months. Oregon governor Kate Brown issued a state of emergency declaration on Thursday evening to remain in effect through to 3 January, saying expected snow and sustained temperatures below freezing could result in critical transportation failures and disruptions to power and communications infrastructure. Recent forecasts show at least an inch of snow was likely to fall on Sunday in the Seattle and Portland regions, which do not typically see snow.īut forecasters and state officials said the main concern was cold temperatures in the region, with daytime highs next week struggling to reach above freezing, that are likely to impact people experiencing homelessness and those without adequate access to heating. In preparation for freezing temperatures, snow and ice in the Pacific Northwest this holiday weekend and next week, state officials in Oregon declared an emergency and shelters were being opened throughout the region to help the homeless. On Thursday, a slow-moving front dumped the most rain and snow parts of eastern Nevada have seen on the date in more than a half century. The local fire authority reported a mudslide on Thursday night in one canyon that affected some roads but no injuries were reported. In southern California, evacuation orders were issued on Thursday night in Orange county because of possible mudslides and debris flows in three canyons where a wildfire last December burned the ground bare. Wind gusts over ridges could exceed 100mph (160km/h), the National Weather Service said, making travel difficult to impossible. About 0.6m (2ft) fell on Thursday at some Tahoe-area ski resorts. The Sierra range could see 1.5- 2.4m (5-8ft) of snow through the holidays, with 3m (10ft) possible at higher elevations, and authorities urged people to avoid travelling through the mountain passes, which could be treacherous.Ī winter storm warning issued on Friday remains in effect until 10am on Tuesday for most of the Sierra, where almost 1m (3ft) of snow had fallen by early Friday at Mammoth Mountain south of Yosemite national park. The warning was lifted around 6pm after inspectors determined the dam was structurally sound and cleared it for continued use, according to the Tuolumne county sheriff’s office. In the Sierra Nevada, an evacuation warning was issued on Thursday for about 150 homes downstream of Twain Harte Lake Dam after cracks were found in granite that adjoins the manmade part of the 11-metre-high (36ft) structure.
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