Chinook, Washington

... Very cold weather will continue this week over the Pacific
northwest with a possibility of light wintry precipitation this
weekend...

A modified Arctic air mass over southwest Washington and northwest
Oregon will continue this week. Daytime high temperatures are expected
to be near freezing while nighttime lows will be in the teens with
a gradual warming trend through the end of the week.

East winds are likely at times in the western Columbia Gorge
through much of the week.

Model guidance continues to indicate a transition out of the
Arctic air mass this weekend. A Pacific system is expected around
Saturday and may bring a wintry mix of snow and freezing rain to
the interior lowlands Saturday before temperatures warm above freezing.

159 PM PST Tue Dec 8 2009

... Very cold weather will continue this week over the Pacific
northwest...

A modified Arctic air mass over southwest Washington and northwest
Oregon will continue this week. Daytime high temperatures are not
expected to rise above freezing today and Wednesday in the inland
valleys... while nighttime lows will be around 10 to 15 degrees
tonight. Coastal areas will also be very cold tonight with low
temperatures in the upper teens to mid 20s... while daytime highs
are likely to remain in the 30s through Wednesday. A slow warming
trend is expected Thursday and Friday but conditions will remain
colder than normal.

Residual northeast winds will continue to decrease in most areas
today. However... some east winds are likely at times in the
western Columbia Gorge through much of the week.

Model guidance continues to indicate a transition out of the
Arctic air mass this weekend. The initial system is expected
around Friday night... which may bring some freezing rain to the
interior lowlands Friday night into Saturday morning.