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Another round of mountain snow will blanket the Sierra Nevada and Cascades early this week.
The storm system can be seen moving across Oregon now with a cold front stretching southward into Northern California and out to sea.
This cold front will help spread cooler air southward into California and across the interior West early this week. Snow levels will lower to about 3,000 to 3,500 feet in the Sierra Nevada. Travel across passes, including Donner Pass, will be difficult through Monday evening.
Snow amounts will likely range between 1 and 2 feet in the Sierra Nevada and up to a foot in the Cascades and Bitterroots.
There is alot of energy moving through and plenty of cold air aloft. It will be unstable enough for some thunderstorms and hail across Northern and Central California Monday afternoon and evening. There will be adequate wind shear for some rotating thunderstorms and an isolated funnel cloud or tornado will be possible.
Winds will also be very strong across the mountains and High Desert in California and across southern Nevada into Utah. Winds can frequently gust between 45 and 55 mph with isolated gusts to 65 mph. This can create blowing dust and reduced visibility as well as down trees in the mountains and cause power outages.
The storm will be quick to leave Tuesday. Models show another upper-level shortwave coming through California and Nevada Wednesday to Thursday. This one does not look to be as strong but could bring some showers or spotty thunderstorms.
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As temperatures rise and smoke increases, air quality will quickly decrease and become dangerous for people in the Northwest.
As another upper-level ridge strengthens over the West this week, high temperature records will again fall in some places.
A strong upper-level ridge will remain in place over the next few days but some relief will arrive in the Northwest.
Another strong upper-level high will shift over the western U.S. this weekend through early next week resulting in intense heat.
Severe thunderstorms brought rain, wind and a wall of dust through Nevada and Arizona Monday evening.
While not as hot as Friday and Saturday, the week ahead will still offer above-average temperatures across much of the Southwest U.S. The threat for monsoonal thunderstorms will also continue.