Aviation Forecast Discussions Data
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(EXTRACTED FROM FXUS66 KSEW 221542)


    An upper trough will move over the area today and then
    over Eastern Washington tonight with southwest flow aloft becoming
    northwest. At the surface, moderate onshore flow will prevail. The
    air mass is moist and slightly unstable.
    
    There will be a mix of VFR and MVFR low clouds today with MVFR more
    prevalent near and in showers. Some drying in the lower levels is
    possible late this afternoon and early evening but low clouds should
    fill back in later tonight.
    
    A Puget Sound Convergence Zone is likely over Snohomish county
    tonight.
    
    KSEA...Expecting mostly VFR low clouds today. Ceilings could lower
    to MVFR at times, especially in showers but this should not be the
    prevailing condition for the day. The low levels will dry a bit late
    in the day but then MVFR or even IFR low ceilings should develop
    later tonight. Gusty south winds 10-15 knots today will ease
    tonight. Schneider