An upper level weather trough of low pressure off the coast today will provide southwest flow aloft giving way to slightly warmer temperatures and sunny skies with highs mainly in the lower to mid-90s. Tonight the upper trough swings northeast into British Columbia with a cold front reaching the Cascades late.
Dry air moves into the area behind the cold front for Friday afternoon with mostly sunny skies, breezy conditions and afternoon high temperatures in the upper 80’s. This will raise concern for fire spread with any new starts.
The large, persistent four corner`s high pressure over the desert southwest will strengthen Saturday and Sunday and then remain in place through mid-week next week. Meanwhile, up over the Pacific Northwest an ill formed secondary low forms off the British Columbia coast Saturday and slowly becomes a proper closed low Monday. The closed low wobbles around just off the coast as the low slowly sinks south along the Oregon coast. Temperatures will remain on the warm side of normal. Relative humidity will be seasonally dry and winds will remain light and terrain driven.
So, Northcentral Washington can expect sunny skies Saturday through Thursday of next week with afternoon high temperatures between 90-95 degrees with overnight lows in the mid to upper 60’s.