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    Southwesterly flow aloft will gradually shift to the
    west and northwest this evening with moderate onshore flow at low
    levels. Abundant low and mid level moisture will continue to support
    light showers  and broken to overcast conditions. A weak Puget Sound
    Convergence Zone is possible, if it does form it is expected to
    remain north of KBFI. VFR ceilings are expected to continue for most
    of the area this evening, lowering to MVFR after 07-08z. The
    exception would be lower ceilings during showers.
    KSEA...VFR conditions with ceilings 4000 to 6000 feet...lowering to
    2500 to 3500 feet around 08z. A few light showers will be in the
    vicinity of the terminal at times. Southwesterly surface winds 4 to
    8 knots.