The Inland Northwest will be on the edge of a building high pressure ridge in the eastern Pacific bringing us sunny weather, light wind and afternoon high temperatures a bit warmer, into the mid 40’s. With warm air from the high-pressure ridge and cold air at the surface, we will see stagnated air through Thursday night.
Weather for Wednesday will be mostly cloudy but warmer with high temperatures near 50 degrees. Conditions may not be as stagnant into Wednesday with the clouds, but little in the way of mixing is likely region-wide Wednesday night through Friday morning. Fog is expected to increase through this week too as dew points see a steady increase with surface moisture mixing into the boundary layer.
Thursday looks like the best chance for fog this week with the best potential for clear skies, a moist boundary layer and weak winds. So, Northcentral Washington will start the day Thursday with foggy conditions which will turn to sunny skies by afternoon and warmer with highs in the mid to upper 50’s.
The upper level ridge begins to break down a bit on Friday as a trough of low pressure and its associated cold front begin to push into the Pacific Northwest Friday afternoon. The front isn`t too impressive and has been becoming less impressive with each new weather model run. The two weak weather systems won’t affect us much at all with mostly sunny skies expected Friday and very mild with afternoon high temperatures near 60 degrees.
As the ridge of high pressure builds back in for Halloween Saturday, weather will be great with mostly sunny skies and highs in the upper 50’s. More of the same for Sunday and Monday with mostly sunny conditions and afternoon highs in the upper 50’s.