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      (For the 12z TAFs through 12z Sunday Morning)
    Issued at 536 AM CST Sat Dec 15 2018
    MVFR and IFR ceilings should improve through the morning hours
    from northwest to southeast as a surface low departs the mid south
    into the Ohio Valley. The area of light rain with its northwestern
    edge across the St. Louis terminals will also shift eastward out
    of the area by midday. A clearing sky is likely by this afternoon
    along with continued northerly winds around 10 knots. Winds will
    become light and variable tonight as a surface ridge of high
    pressure moves across the mid-Mississippi Valley. We will have to
    keep an eye on the possibility of late night fog development,
    particularly at KUIN/KSUS/KCPS but not confident enough at this
    early juncture to mention in the TAFs.
    Improving conditions are likely through the morning hours as area
    of light rain shifts off to the east, along with improving
    ceilings/visibilities. VFR conditions are then favored for the
    remainder of the valid TAF period, but cannot rule out some MVFR
    visibilities in fog late tonight/very early Sunday morning.
    Northerly surface winds today will become light/variable late
    tonight as a surface ridge of high pressure moves over the area.