Aviation Forecast Discussions Data
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    For the 00Z TAFs...
    631 PM...Forecast concerns include...
    Chance of thunderstorms Saturday afternoon.
    Wind directions Saturday afternoon/evening.
    Patchy fog early Saturday morning.
    Current thunderstorm activity across southern lower MI/northwest
    OH and northeast IN is expected to diminish this evening and
    remain east of the terminals. A cold front currently across the
    upper midwest will move across the area Saturday afternoon and
    there will be a chance of thunderstorms as this front moves across
    the Chicago area terminals. While there remains some uncertainty
    for coverage...confidence is increasing for at least some
    thunderstorms and they may develop over or near the terminals and
    opted to change the current prob to tempo. Timing looks on track
    but may need to be adjusted a little earlier as trends emerge. Any
    storms that form will likely produce outflows leading to gusty/
    erratic winds. The chance for storms should be ending by early
    Saturday evening.
    East/northeast winds this evening will become light and variable
    or light westerly overnight. West/northwest winds will continue
    Saturday morning...possibly becoming more northwest at times. A
    lake breeze is expected to move inland and likely through ord/mdw
    shifting winds to the east/northeast. This lake breeze is
    dependent on thunderstorm development/timing...which if they occur
    sooner may limit the lake breeze potential. Winds appear to favor
    a north/northeast direction behind the front into Saturday evening
    but confidence is fairly low as winds may end up more north/
    northwest Saturday evening.
    Some patchy/light fog is expected generally south of a pnt/gyy
    line tonight with perhaps more widespread fog toward central IN.
    Confidence is low for how close this fog may get to the terminals
    but opted to include tempo for mvfr vis at gyy. cms