Aviation Forecasts Discussions (AFD) INFO

(EXTRACTED FROM FXUS66 KSEW 190545)


    A flat upper ridge aloft will exit to the east
    tonight. A strong cold front will spread down the British
    Columbia coastline tonight and move southward through Western
    Washington later Sunday. The front will be preceded by heavy rain
    and strong southerly surface wind. Moderate westerly flow aloft
    this evening will become strong on Sunday while strong south to
    southwest winds develop between 1500 and 6000 ft MSL midday Sunday.
    The air mass is stable and will become increasingly moist late
    tonight and Sunday. Expect mainly VFR conditions across the area
    today with conditions lowering to IFR in precipitation and low
    ceilings from the northwest on Sunday. Albrecht
    
    KSEA...Only FEW-SCT035 with moisture above 120 through most of
    tonight. CIGS around 035 will rapidly develop about 12Z late
    tonight with rain developing later Sunday morning. CIGS and VSBYS
    will lower Sunday afternoon to 008-012 into the evening hours in
    occasionally moderate rain. South wind at the surface 6-10 kt
    through Sun morning will increase to 15G25KT about 18Z. Winds at
    025 will increase to 19060kt 20Z-02Z Sunday with peak winds
    between 040 and 060 of 19070kt. Albrecht