Out here in the Pacific NW, the best maps are those produced by the Univ. of Washington Dept. of Atmospheric Sciences. You can get versions that cover both OR and WA. Do I know how to use them? No, not really, but I can get a pretty accurate weather prediction for the next 72 hours.
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey