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New Years Winter Storm


Chicago Storm
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Here's a loop to illustrate this, showing pwats and low-mid level winds.  Look at where the trajectories are from.  >0.5" pwats on the wintry side of the system are pretty decent
18-Z-20211231-NAMUS-prec-pwat-0-36-100-100.gif

Thank you.

Like I said, mostly Pac driven moisture.

Can also been seen on the multiple WV imagery levels, 850mb dew points, etc.
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8 minutes ago, Sciascia said:

NAM is coming in…*shakes dice*

*Throws dice* Drier!

00z:

45787E02-A39E-4EBC-88DA-2251BA894BA4.jpeg

18z:

BE0A4ADD-3BA7-4519-A299-18052155C946.jpeg

highest amounts in Mchenry easy toss. 4-8 envelope seems unchanged. And 00Z NAM less than 24 hrs from storm initiation is known for  huge hiccups this is barely a breath. 

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2 hours ago, nwohweather said:

Tomorrows southern severe outbreak is going to play a huge role on the snowy side of things. Just too likely that intense convection is going to rob the backside of the storm of moisture, 3-5” except back towards the IA/MO/IL border is probably best bet. 

Yep just like Dec10th -11th severe outbreak. Upper Midwest suffered..oh wait1009759116_Screenshot_20211231-202401_SamsungInternet.thumb.jpg.41b64740b91179c45a63c7cfabd80fc6.jpg

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9 minutes ago, Baum said:

highest amounts in Mchenry easy toss. 4-8 envelope seems unchanged. And 00Z NAM less than 24 hrs from storm initiation is known for  huge hiccups this is barely a breath. 

Damn I hate it when your right.lol

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2 minutes ago, mimillman said:

Big brother

Paragraph is below for anyone interested.  This doesn't have to be a binary yes/no thing as far as convection having an impact.  It can be no/little impact all the way up to big impact.  For reasons that have been outlined, don't think it's *as* big of a problem as it could be in other types of setups.

 

The overnight shift will continue a more thorough assessment of
the upcoming snow event and evaluation of headlines including
their timing. There will be a lot of convection in the warm sector
Saturday morning into early afternoon, and that will have some
robbing moisture transport effect and potentially is why some
guidance is bringing that northern snowfall gradient more into the
CWA. However, ample synoptic forcing for the afternoon and
evening for snow -- heavy at times -- and then the lake enhanced
support into far northeast Illinois for the evening and overnight,
all continues to look in-line with the forecast.

MTF
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^not that I'm a pro by any stretch, but just the fact it is not a classic wound up storm it is not drawing a huge moisture feed from the GOM. Caveat, one of the reasons were not seeing some of the higher totals some models implied  earlier on.

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pretty clear the 12Z Euro from yesterday was the first to sniff out the fading moisture as this heads east. Tonight's runs continue to fade totals in LOT zones including GFS and NAM. Looking more like 3"-6" event with little lake enhancement. Still be a nice event for holiday as opposed to 30's and sunshine.

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