An area of low pressure and its associated trough off the Pacific Northwest Coast will begin to move into the Pacific Northwest over the weekend. This will spread cloudiness and showers into the Pacific NW friday night and saturday. Thereafter..the trough will continue to progress to the east and the rainy weather should move east of the region just in time for sunday. Meanwhile the rest of the west coast looks to enjoy fair weather conditions.
After this trough progresses eastwards with its associated rain.. high pressure will build into the region as the PNA spikes positve and the EPO goes negative. This will result in a ridge building across the western area and pacific northwest with high pressure in control. If this were summer time temperatures would approach the high 90s and lower 100s under this setup. However..as a result temperatures will end up being in the 80s across the region.
Along the west coast in California, where generally fair and sunny conditions develop ..temperatures could exceed 90 degrees once this high pressure and ridge builds across the west. So at least in this part of the USA..summer is not over..
Rainfall across washington, montana and parts of Idaho will generally be on the light side from a T to less then .75 inches from the approaching trough and area of low pressure.
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