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    A weak upper level trough will cross the Pac NW
    tonight but the air mass across Western Washington will remain
    dry. Wildfire smoke will continue to impact the region as
    northerly flow brings in smoke from B.C. May see 4-6SM visibility
    with a ceiling around 4,000 ft as smoke mixes down to the
    surface. Light winds and stagnant conditions may lead to a
    decrease in visibility overnight due poor mixing. Strong high
    pressure will build offshore on Monday for more smoky, northerly
    flow over Western WA. 33
    KSEA...Visibility 4-6SM this evening with smoke. Visibility may
    drop to 3SM overnight with a smoke layer around 4,000 ft. N winds
    at the surface to 10 kt. Similar conditions on Monday. 33