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Feb 12-13 Snowstorm


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There is some variance in the 2m temp progs on Wednesday, with the NAM generally being coldest and the Euro on the warmer end.  If the warmer solution pans out, then it could cause some of the initial snow to get wasted in some areas... this would be less of an issue with northward extent where later onset of late afternoon/early evening is better timed with the start of the nocturnal cooling cycle.

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12z Euro = lock it in. :weenie:

Seriously though, if we can get a decent phase, this has the potential to wipe out 2-3 months of misery for many. Getting the pieces to mesh is always tough though, and at this time and juncture, I am going to doubt getting something as clean as the Euro has to offer until we get some more data in. Cautious optimism. 

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1 minute ago, geddyweather said:

12z Euro = lock it in. :weenie:

Seriously though, if we can get a decent phase, this has the potential to wipe out 2-3 months of misery for many. Getting the pieces to mesh is always tough though, and at this time and juncture, I am going to doubt getting something as clean as the Euro has to offer until we get some more data in. Cautious optimism. 

Personally I'd need a lot more than this to "wipe out" all the misery.  Not like we are talking about an 18-24" big dog.

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couple of things i do like, really nice looking jet support over the plains as the trough ejects weds, should be quality divergence and a healthy area of snow and an actually cold air mass associated with the northern stream piece, sim radar products with that textbook baroclinic leaf look

enjoy it now before flatness reigns at 0z

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1 hour ago, A-L-E-K said:

couple of things i do like, really nice looking jet support over the plains as the trough ejects weds, should be quality divergence and a healthy area of snow and an actually cold air mass associated with the northern stream piece, sim radar products with that textbook baroclinic leaf look

enjoy it now before flatness reigns at 0z

related from LOT

 

Quote

The upper pattern for this system is once again a tale of split
flow and how it interacts/phases into the eastern half of the
country. The closed upper low presently over the northern Baja
Peninsula will meander east-northeast into Tuesday before it is
forecast to be "picked up" by a strong northern stream jet trough.
This trough will be an extension of the polar lobe oriented over
Hudson Baby by mid to late week and will have notably cold air
associated with it (850 mb temperatures of -25C into the Upper
Midwest and Upper Great Lakes). The overall jet pattern is
especially noteworthy, with a broad jet maximum of 165-185 kt
across the Great Lakes into Northeast, which is in the top
percentile for this time of year using a 30-year dataset. The
broad right entrance region of this jet is what favors interaction
between the two troughs and likely phasing that has been
consistently forecast.

 

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DVN isn't impressed: 

The 12Z model suite has shown more phasing than past runs with the
upcoming system. The QPF has shifted north, resulting in models
producing typical advisory levels of snow over the CWA and the
rest of northern IL. However, no model run has really indicated a
closed mid level circulation in this phasing, thus the
precipitation should be mainly driven by WAA and not be long
lasting or heavy in the cold side of the system (not a persistent
def zone). While I am on board with increasing pops to likely for
this event, we may not have a cold boundary layer over our region,
and that could greatly limit any snow accumulation until the
Arctic front arrives Wednesday night, and once again, unless
there`s reason to draw moisture back over the cold air, that
process should shut down the widespread rain/snow. Snow showers
may develop with low level lapse rates peaking in the gusty Arctic
transition.
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Duration does look better east of the DVN cwa.  In fact, it looks like it could be snowing here for ~24 hours with little/no breaks.  It is one of the reasons why I am fairly bullish on getting over 4"... in a short duration storm, there is less time to make up ground if you get off to a bad start.  

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