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Nov. 25th-26th Midwest Snowstorm Potential


Malacka11

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LOT aviation update is almost like a mini afd

.AVIATION...
For the 00Z TAFs...

MVFR cigs over far northern IL likely to linger through much of
tonight and probably slowly sink south as low level flow veers to
a more northerly direction through the night. Primary focus of
this TAF cycle is on the impending winter storm Sunday afternoon
and night.

WINTER STORM FORECAST:

Overview: East-west oriented band of rain or rain/snow mix will
develop across northern IL Sunday morning. Band will probably set
up close to ORD/DPA/RFD, outside of that band look for mainly dry
conditions during the morning and afternoon. Main slug of
precipitation, likely becoming heavy at times will overspread the
terminals between 21-00z and continue through 04-07z.

Precip type: Initially precip likely to be rain, transitioning to
snow at ORD/DPA/MDW between 21-00z, GYY likely after 00z, and RFD
prior to 18z.

Winds: Northeast winds develop by mid-morning Sunday and then
slowly ramp up through midday into the afternoon, likely becoming
stronger and more gusty by late afternoon. Winds will likely peak
Sunday evening (after 00z) with frequent gusts 30-35kt likely with
gusts over 40kt possible (likely over 40kt at GYY closer to the
lake). Sunday evening, wind direction will slowly back from NE
(030-050) to a more northerly direction (360-020).

Visibilities/CIGS: Initially MVFR conditions Sunday afternoon
should quickly deteriorate to IFR by early Sunday evening with
LIFR/VLIFR CIGS/Vsby both likely at times Sunday evening. All
indications are that MDW will drop below mins in heavy snow Sunday
evening with ORD and MDW both potentially experiencing temporary
blizzard conditions with Vsby less than 1/4SM.

Snowfall Rates, Accumulations, & Blowing/Drifting: Snowfall rates
of at least 1" per hour are fairly likely at times, mainly
between 22z- 04z. There is a chance of snowfall rates exceeding 2"
per hour in the heaviest band. Storm total snowfall for ORD/MDW
looks to be in the 6-10" range. Snow is expected to be fairly
heavy and wet, which should reduce the severity of blowing and
drifting, however given winds gusting between 30-40kt Sunday
evening, some blowing and drifting of even the heavier wet snow is
likely.

- Izzi

 

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Just now, StormChaser4Life said:

Not sure it shifted. It just has a wider jackpot zone. Also not as brutally sharp cutoffs. Probably not realistic though as the mesoscale bands will have brutal cutoffs

I'm talking like 10 or 15 miles lol.  The northern extent and the southern extent looks like a shift by about that much.  

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5 minutes ago, StormChaser4Life said:

Not sure it shifted. It just has a wider jackpot zone. Also not as brutally sharp cutoffs. Probably not realistic though as the mesoscale bands will have brutal cutoffs

Could represent bands that shift a bit during the duration of the storm though too.

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2 minutes ago, RyanDe680 said:

Also, quoting LOT's winter outlook that I was reading last week:

"If a signifiant snowfall occurs prior to start of December, probability of above normal snowfall for the fall-spring season will increase."

Could shape up to be a fun winter.

And if it doesn't, then the chances decrease.. :)

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That 00z HRRR is extremely impressive.  One for the books for the QCA.  Haven't made my first call yet, but I guess I'll go with 10-12" for here/QC.  Gonna stick with 10:1 LSR due to very wet snows to start, and some granulation from the very strong winds.  LSRs would likely be much higher as the storm goes on, and underneath the enhanced bands, but I think 10:1 avg throughout works well for now.

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5 minutes ago, CoalCityWxMan said:

I don’t think what you’re referring to is mixing, it’s just heavy snow. 

That would be some mix. Sleet, snow. Not solid snow. Esp given where it tracks the low near I72. One thing I have noticed, even with HRRR, is that it tends to miss how rapid dynamic cooling can take place. Changeover could be quicker than it shows. Do you think the low will track that north? My gut has always been on I70

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