Weather satellite is still showing a very wet feed of Pacific moisture directed into the forecast area this morning ahead of an occluded front, which is visible moving onto the Washington Coast early this morning. The deep moisture will almost guarantee universal precipitation over the forecast area this morning with mainly valley rain. Once the front passes, the forecast area will enter a westerly flow regime, which should encourage a drying trend in the rain shadowed deep basin during the early afternoon with precipitation becoming showery and more spotty over the eastern basin later in the afternoon. We can expect a 60% percent chance of rain this morning with mostly cloudy skies this afternoon. High temperatures today will be warmer into the low and mid 40’s.
Partly cloudy skies in the forecast for Wednesday before a weak weather disturbance tracks through Wednesday night through Friday bringing a chance of light precipitation at times. There is a 30% chance of rain Thursday, Thursday night and Friday with high temperatures around 40 degrees.
Saturday through Monday, an upper level trough becomes established over the Western U.S. as an upper ridge amplifies off the coast. This will result in a cooling and drying trend going into early next week as a Canadian air mass settles in. High temperatures will drop into the mid to upper 30s while overnight lows will drop mainly into the teens to lower 20s.