Aviation Forecast Discussions Data
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(EXTRACTED FROM FXUS63 KLOT 180531)


    
    For the 06Z TAFs...
    
    Multiple forecast concerns this forecast period continue including...
    
    Cigs through Friday afternoon.
    Snow start time/location Friday afternoon.
    Associated vis/cigs with snow.
    Winds/blowing snow Saturday morning.
    
    No significant forecast concerns through midday Friday. The threat
    of drizzle/freezing drizzle has ended and not expecting any precip
    chances overnight. Northwest winds generally under 10kts will turn
    more northerly by morning then northeasterly by late Friday
    morning. Mvfr cigs are likely to fill back in over the next few
    hours and while some clearing is still possible into far northern
    IL by morning...confidence is decreasing and maintained mvfr cigs
    Friday for all but rfd.
    
    A band of snow is still expected to develop across far northern IL
    by late Friday afternoon...first at rfd and then into dpa/ord.
    Adjusted tempo timing slightly but still not confident enough to
    go prevailing snow just yet. If these trends continue...prevailing
    snow with vis under 1sm may be needed in this corridor. This band
    also may shift a little further south...possibly affecting mdw by
    late afternoon. Snow will then spread across the entire area
    Friday evening and continue into Saturday morning. Prevailing vis
    is expected to be below 1sm for much of this time period and
    likely in the 3/4sm to 1/2sm range with some vis restrictions from
    fog/mist.
    
    Temperatures will be slowly falling Friday night into Saturday
    morning and the snow will begin to get drier/slightly more fluffy.
    Northeast winds will increase to 10-15kts Friday afternoon with
    gusts into the 20kt range Friday evening and then speeds/gusts
    will continue to increase Saturday morning. Thus blowing snow will
    likely develop at some point early Saturday morning. cms