Tri-Cities, Washington

... Significantly colder temperatures will be expected late this
weekend into next week...

An Arctic air mass will invade the Pacific northwest late this
weekend... and remain over the area through the middle of next
week. High and low temperatures will be 15 to 20 degrees below
normal... with the coldest of these days expected to be Sunday
through Tuesday. All areas can expect the possibility of snow
showers from time to time... as temperatures will struggle to reach
freezing at best in the lower elevations. Cold air trapped in the
Columbia Basin and surrounding valleys will likely persist through
the later part of next week until the next weather system is
expected to arrive. Please monitor the latest forecasts and
statements from the National Weather Service or your local media
outlets for more detailed information.

... New daily record low temperatures for December 3rd...

Note: stations marked with * indicate that the station reports once
per day. For consistency... these values are considered to have
occurred on the day the observation was taken but may have actually
occurred (especially for Max temperature) on the previous day.

Station previous new records
                         record/year record began

Meacham, or 9 / 1972 8 1948
*mitchell, or 21 / 2006 17 1949