Aviation Forecasts Discussions (AFD) INFO


    A broad upper level trough will move eastward across
    the area tonight and will be followed by a flat upper level ridge
    Monday into Monday night. Moderate westerly flow. The air mass is
    somewhat unstable this evening and will stabilize later tonight
    through Monday evening.
    An band of showers sits from the Olympic Peninsula southwestward
    into the Oregon offshore waters this evening. This shower band is
    expected to shift eastward into the interior early Monday morning.
    Cigs across the area are a mixed bag with most of the major
    terminals seeing MVFR conditions. Expect ceilings to lower somewhat
    early Monday morning as the shower band passes through, then
    conditions will improve Monday as showers become confined to the
    terrain. Isolated thunderstorms have been observed on the
    northwestern Olympic Peninsula this evening. Expect the threat of
    additional tstm activity to decrease rapidly as the air mass
    stabilizes. Albrecht
    KSEA...Expect a general break in showers until about 10Z when the
    next bend now over the Olympic Peninsula moves into the area. Cigs
    will generally be in the MVFR category (FL025-030) through Monday
    morning, with a possible drop to FL015-020 12Z-16Z with the showers.
    South flow 6-10 kt through Monday evening. Albrecht