From Seattle weather guru Cliff Mass:
The First Autumn Storm Makes Landfall on Wednesday
It is very typical for first "autumn-like" storm to reach our region during the third week of August....and this year will not be an exception. In fact, we have two systems that will be making landfall this week, with the first one being the strongest.
You can see the impact of this "first autumn storm" in the precipitation climatology Seattle. Below is the daily climatological probability of enjoying at least .01 inches at Sea-Tac. At the end of August the probability jumps to roughly 25%!
Much more at the site. We usually have a wonderful Indian Summer but these first storms are the beginning of Fall and Winter to be sure. That certainly jives with the local forecast:
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