KLOT Aviation nice writeup by Ricky
AVIATION...
For the 12Z TAFs...
608 AM CST
The concerns include:
* Ongoing snow with lake enhanced snow likely to occur mid to late
morning through early evening, with at least temporary 3/4SM
VSBY likely and 1/2SM VSBY possible, accompanied by 006-008 CIGs
* Gusty northeast winds continuing, with gusts up to 30 kt
possible this afternoon
Slow moving low pressure will continue to bring waves of snow
into or through this evening at the TAF sites. RFD will be on the
northwest periphery and see mainly lighter snow. The Chicago area
terminals are in a temporary lull early this morning, however
forcing is expected to increase during the mid to late morning
with lake enhancement to the snow all the way through the early
evening. At least temporary 3/4SM VSBY appears likely during this
activity, with at least brief 1/2SM VSBY quite possible. This is
based off upstream observations over southeast Wisconsin where the
lake enhanced snow is currently located paired with favorable
forecast soundings. The 12z TAF has prevailing 1SM VSBY, but it`s
possible a period of prevailing lower VSBY occurs.
The most favored time for potential prevailing sub 1SM and
occasional 1/2SM VSBY is this afternoon. Another item of note
during this afternoon window of potential moderate snow is an
increase in northeast wind gusts up to 25-30 kt. The snow should
finally wind down by early to mid evening and largely come to an
end by 06z, except maybe a bit longer for GYY. Additional snowfall
accumulations will be up to 2-4" of fluffier snow than last
night, with 1-3" at DPA and up to 1" at RFD. IFR to lower end MVFR
CIGs early this morning should build back down to IFR in 006-008
range with lake enhancement, then improve after the snow ends this
evening. MVFR CIGs then look to prevail through at least Monday
morning.
Castro
