Aviation Forecast Discussions Data
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(EXTRACTED FROM FXUS63 KLOT 031142)


    
    For the 12Z TAFs...
    
    The main aviation weather concerns during this forecast period
    consist of:
    
    * Lingering spotty VFR -RA early this morning
    * Weak FROPA this evening with a northwest wind shift
    * Potential for low-MVFR cigs this evening and overnight
    
    Spotty -RA will remain in the C90 airspace through mid-morning
    before activity fully pushes east of the region. Mid-level cigs
    will gradually clear into the afternoon with prevailing east to
    northeasterly surface winds around 7-10 kts. A weak front will
    push across the terminals this evening yielding a gradual north
    and northwest wind shift. There's some potential for some
    occasional gusts to around 15-20 kts as this occurs, but have left
    a mention out of the TAFs given the anticipated brief nature of
    gusts.
    
    There is a developing signal in some of the short term guidance
    for a period of low-MVFR cigs and perhaps some brief VFR BR with
    the frontal passage this evening. This signal remains a bit too
    spotty to justify a formal mention in the current TAFs at this
    time, however. Main window for potential development appears to be
    approximately 04-12z. For now, have indicated FEW-SCT010 groups
    with the wind shift tonight, and if confidence in cigs increases,
    prevailing or TEMPO groups may become necessary.
    
    Carlaw