Aviation Forecasts Discussions (AFD) INFO

(EXTRACTED FROM FXUS63 KMPX 210524)


    (For the 06Z TAFS through 06Z Sunday night)
    Issued at 1120 PM CST Sat Jan 20 2018
    
    High ceilings look to remain fairly stoic through the overnight
    period into much of tomorrow in advance of the potent winter storm
    expected to strongly impact the region Sunday night through
    Monday. The consequence of the high clouds tonight will be to
    prevent fog development to a more widespread degree, despite winds
    going calm and warm air resident over residual snowpack.
    Additional moisture will begin to stream in from the Deep South
    ahead of the storm system but while this is mainly taking the
    form of the high clouds, there still will be patches of MVFR
    visibility in MN with MVFR-IFR potentially at the WI TAF sites.
    The high clouds will then steadily lower during the day tomorrow,
    resulting in MVFR to IFR ceilings tomorrow evening. Except for
    KMSP which covers 30 hours, it is still too early to mention
    precipitation at this point as chances won't increase until after
    06z tomorrow night. Winds will be fairly light out of the north,
    if not calm, overnight before becoming northeast 5-10 kt tomorrow.
    
    KMSP...Will maintain VFR conditions through tomorrow afternoon as
    high clouds lower to mid-levels. Cannot rule out MVFR-IFR fog
    close to daybreak Sunday morning so with winds going calm, have
    added a mention of MVFR visibility around 12z. Ceilings will
    lower to MVFR then IFR levels tomorrow evening in advance of the
    strong winter storm system. Conditions will deteriorate further
    beyond 06z tomorrow evening, including the commencement of light-
    moderate snow along with increasing winds, making for a difficult
    Monday morning push.
    
    /OUTLOOK FOR KMSP/
    Mon...IFR/LIFR with +SN/BLSN. Several inches of snow likely.
    Winds N 15-25 kts gusting to 30 kts.
    Tue...Mainly VFR. Winds NW 5-10 kts.
    Wed...Mainly MVFR with a chance of IFR cigs. Winds 5 kts or less.