Durham, California

... Frost advisory in effect from 1 am to 9 am PST Monday...

The National Weather Service in Sacramento has issued a frost
advisory... which is in effect from 1 am to 9 am PST Monday.

A dry airmass will remain over northern California tonight... allowing
temperatures to once again fall into the lower to mid 30s across
the Sacramento Valley... northern San Joaquin Valley... and Delta
Region. Some locations may even be within a couple of degrees of
their records. As a result... areas of frost will develop during
these early morning hours on Monday.

Precautionary/preparedness actions...

A frost advisory means that frost is possible. Sensitive outdoor
plants may be killed if left uncovered.

... Wet and wintry weather to return on Tuesday and again on Thursday
and Friday...

Unsettled and wintry weather will return on Tuesday... as a series
of storms move through northern California. The first quick moving
system will move across the northern interior Tuesday afternoon
and evening... bringing some valley rain and mountain snow to the
region. Snow levels will lower to around 3500 feet in the northern
mountains to around 5000 feet Tuesday night. A stronger and more
impressive system will then move into the region on Thursday and
Friday. Locally heavy rains... mountain snows... and breezy
conditions are expected to develop Thursday and intensify Thursday
night and Friday.

Travelers crossing mountain passes will likely have to Cope with
snow and blowing snow by Tuesday afternoon... as snow levels may
drop as low as 4000 ft on Wednesday morning. Snow accumulations up
to six inches may be possible over the higher elevations... making
traveling treacherous over the Sierra. Heavier snowfall and
accumulations are possible on Thursday night into Friday... as snow
levels levels once again drop to around 4000 feet on Friday.