... An unseasonably cold storm system will affect western Washington
the end of this week...

A strong... cold low pressure system dropping south out of Canada
will usher in a colder air mass that will result in unseasonably
cold temperatures and plummeting snow levels by this weekend.
Daytime temperatures on Friday will be in the mid 40s to lower 50s
across The Lowlands and in the upper 20s to mid 30s in the Cascade
passes. On Saturday... daytime temperatures are expected to be
winter like. Daytime temperatures across The Lowlands about this
time of the year are normally in the mid 50s to lower 60s.

The snow level will also plummet to near sea level late Friday
night... thus it is likely that any showers over The Lowlands will
change over to snow or a rain and snow mix. The precipitation will
change back over to rain during the day Saturday. The threat for
snow showers will continue across The Lowlands late Saturday
night and early Sunday morning.

If any clearing occurs across The Lowlands at night... it could allow
temperatures to dip into the mid 20s at some locales... especially
over the southwest interior. Therefore those with frost sensitive
Nursery stock... ornamentals... or vegetables should monitor the
forecasts from the National Weather Service closely the next few
days