November 15, 2018
An upper level ridge of high pressure is building just off to the west. This will allow a weak disturbance to ride over the ridge and drop southward, possibly bringing some light rain into southwestern Washington later tonight through tomorrow. The good news for us is the ridge will continue to build tomorrow which keeps any rain north of our area.
So, stronger high pressure builds in tomorrow and persists over the area Saturday and Sunday, bringing sunny daytime skies with light easterly winds which may cause some air stagnation issues, especially over in the valley. This also means clear, cool nights! A combination of the low dewpoints, light winds, and clear skies will allow the temperatures at night to drop into the mid 30s over the weekend.
The models are starting to come into better agreement for next week. It now appears the high will slowly shift eastward but at least for Monday into Tuesday the light winds will continue the concern for air stagnation issues at least through early Tuesday. There is still a little difference in the timing of the next front, so the rain chance starts as early as Tuesday, or it may hold off until Wednesday.
Highs continue in the mid and upper 50s for the period, lows 35-40.
Tillamook Area Forecast