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Dec 28th Winter Storm


Chicago Storm
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KLOT

AVIATION...
For the 18Z TAFs...


Upper-level clouds will thicken toward daybreak Tuesday as a storm
system approaches from the southwest. Precipitation will arrive
at the terminals between 17 and 18Z and continue through 21 to
22Z. Confidence is increasing that the predominant precipitation
type may end up as steady snow, especially at RFD/DPA/ORD/MDW,
with steady temperatures prevailing near the freezing mark. After
collaboration with CWSU ZAU, the outgoing TAF package will
feature TEMPO groups for visibility and ceiling drops to 3/4SM and
300 feet, respectively, at ORD and MDW between 18-21Z. Should snow
end up steady enough, visibility may actually drop as low as
1/2SM. Elsewhere, targeted TEMPO groups may be introduced with
the 00Z TAF package. After 21Z, the snow is expected to transition
to light rain showers or drizzle as temperatures warm above
freezing, though ceilings should remain at or below 500 feet.
Winds are expected to be out of the southeast through the
precipitation event. Confidence is medium in the forecast for
precipitation type and associated reduced visibilities and
ceilings.

Borchardt
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Would probably go with a WWA for north and eastern portions of the DVN CWA given potential for briefly heavy rates during the morning commute, along with the fact that this will be the first impactful snow event of the entire season.

 

Though forecast soundings overwhelmingly support small flake size out this way, so I question how heavy rates will actually be. Let's rephrase that to "reduced visibility"

 

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37 minutes ago, Chicago Storm said:


1-3” most of the area.

Only exception likely to be the heart of metro, with probably a DAB, given slightly warmer temps.


.

So you're saying it's not going to be a world class first measurable snow of the season like Nov 2015 at ORD, when 11.2" fell?  :P

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URGENT - WINTER WEATHER MESSAGE
National Weather Service Chicago IL
203 PM CST Mon Dec 27 2021

ILZ003>006-008-010>013-103-104-280415-
/O.NEW.KLOT.WW.Y.0013.211228T1500Z-211229T0000Z/
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
Northern Cook-Central Cook-
Including the cities of Rockford, Belvidere, Crystal Lake,
Algonquin, McHenry, Woodstock, Waukegan, Buffalo Grove,
Mundelein, Gurnee, Rochelle, Oregon, Byron, Dixon, DeKalb,
Sycamore, Aurora, Elgin, Naperville, Wheaton, Downers Grove,
Lombard, Carol Stream, Evanston, Des Plaines, Schaumburg,
Palatine, Northbrook, Chicago, Cicero, Oak Lawn, Oak Park,
and La Grange
203 PM CST Mon Dec 27 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 9 AM TO 6 PM CST
TUESDAY...

* WHAT...Slippery travel conditions due to steady snow expected.

* WHERE...Portions of north central and northeast Illinois.

* WHEN...From 9 AM to 6 PM CST Tuesday.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...The peak snow rates of up to one half inch
  per hour are expected between noon and 3 pm CST. Snow totals are
  expected to range from 1 to 3 inches by the time snow ends.
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Even though its on the low end, its the first meaningful event of the year for Chicago, I don't mind it.

Yea, this shouldn’t be a surprise.

First event, even if under criteria, usually gets a headline. If some of the snowier guidance works out, some places will be advisory criteria anyway.


.
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