SnowBrains Forecast: A Taste of Winter in California, Oregon | 3-8” Snow by Monday

Nathan Tarino |
ECMWF 24 hour snowfall output valid Monday morning. Source:
Forecast by SnowBrains Meteorologist Rowan Sullivan
3:30 AM MST 8/15/21

Forecast Summary:

A cold front will bring a round of winter weather to the Oregon Cascades and the northern portions of California late this weekend.
High elevation snow will begin Sunday afternoon. Temperatures will fall fast through the night, bringing some of the coldest weather of the season.
Snow levels will fall below 5,000′ Sunday night into Monday, with 3-8″ of snow accumulating before snow tapers off Monday morning.
Another storm is likely on Wednesday, bringing more snow to the highest elevations.

Short-Term Forecast:

Sunday evening – Monday:

A powerful trough will move ashore in Northern California on Sunday night, bringing overnight snow from near Mount Bachelor, OR, southward to the Lake Tahoe area.
Expect 3-6″ of snow across the area, with some totals approaching 8″ possible in the highest peaks.
Snow will end by lunchtime on Monday as drier air flows in from the northwest.
Downscaled Snow Product
This model does a good job depicting where snow will accumulate overnight Sunday. Source:

Long-Term Forecast:


After the late weekend storm, dry weather will persist until late Tuesday night, when the next chance for a storm arrives.
Another cold front is likely to move through the area early Wednesday morning, bringing rain and mountain snow.
Warmer air associated with this storm is expected to keep snow levels above 6500′, limiting accumulations.

Extended Forecast:

Thursday and Beyond:

Ensemble forecasts continue to signal a stormy period to end the month.
Stoke levels are rising, and chances for mountain snow are likely to continue for the rest of October.
6-10 day precipitation outlook
Wet conditions will prevail through the extended forecast. Source: NOAA.

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