The final storm in a series of systems is approaching the Pacific coast from Washington to Northern California. AccuWeather meteorologists caution that the upcoming rain could lead to flash flooding, mudslides, and snowfall over the Cascades and Sierra Nevada, potentially impacting travel through Sunday night.
Rain of varying intensity is expected from western Oregon to Northern California and western Washington, with the heaviest rainfall of 4-8 inches forecasted from southwest Oregon to Northwestern California. Localized areas on the west-facing slopes of the Coast Ranges, Siskiyous, and Oregon Cascades could see up to 18 inches of rain, increasing the risk of flash flooding, mudslides, and road hazards.
The saturated ground from previous storms coupled with the current heavy rainfall could result in slick road conditions in cities like Seattle, San Francisco, Portland, Sacramento, Eugene, and Astoria. Strong winds could also cause trees to topple over and result in power outages from Northwestern California to southwestern Washington.
Snow levels are expected to drop on Sunday, with up to 12 inches of snow possible over the northern Sierra Nevada and 6-12 inches likely in the Washington Cascades. Spotty snowfall is anticipated over the mountains in eastern Oregon, Idaho, western Montana, and parts of Nevada, Utah, and Colorado through early Monday.
The storm system is unlikely to impact Southern California and southern Nevada, keeping soil conditions dry. High pressure building over the Great Basin next week will provide a break in the stormy weather for areas from western Washington to Northern California on Monday and Tuesday.
Southern California may experience Santa Ana winds with increased wildfire danger from Tuesday to Wednesday. Open flames and fireworks are not advised during this time. The winds may subside in time for the New Year’s Day parade in Pasadena, with Downtown Los Angeles potentially shielded from the strongest gusts.
Overall, a brief respite is expected before the next round of unsettled weather arrives across the region.
K will allow cleanup operations to commence and provide decent travel conditions in the region. The next storm will likely bring low-elevation rain and mountain snow by New Year’s Day to areas as far south as the northern tier of California. Additional storms with some rain and mountain snow are likely to follow later in the week, but they do not appear to be as potent or carry as much moisture as the storms from the latter part of December. Want next-level safety, ad-free? Unlock advanced, hyperlocal severe weather alerts when you subscribe to Premium+ on the AccuWeather app. AccuWeather Alerts™ are prompted by our expert meteorologists who monitor and analyze dangerous weather risks 24/7 to keep you and your family safer.
