Aviation Forecast Discussions Data
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(EXTRACTED FROM FXUS66 KSEW 092130)


    A frontal system will move inland this evening. An
    upper trough will settle over the area tonight behind the front
    then move inland on Monday with a short wave upper ridge moving
    over Western Washington. Southerly flow aloft this evening will
    become westerly tonight. At the surface, strong east to southeast
    gradients ahead of the front will turn weakly onshore behind the
    front tonight. The air mass is moist and stable.
    
    Ceilings will continue to lower this afternoon and evening with
    MVFR becoming widespread and local IFR conditions. Ceilings should
    lift a bit later in the day on Monday.
    
    KSEA...Ceilings should lower to MVFR late early in the evening.
    Rain will change to showers tonight but low clouds will linger.
    Some improvement is likely later Monday. Southwest to south wind
    6-12 knots. Schneider