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Model Mayhem Snowstorm! 2/2-2/4


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Figured it was close enough to start its own thread.

StormTotalSnow.thumb.jpg.2a919132fbdbb3835e2471b9c6fa69e2.jpg

 

.SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/...
...Increasing potential for a long duration, impactful accumulating
snowfall during the mid week period...

A Winter Storm Watch is now in effect for all of western and north
central New York Wednesday night through the first half of Friday.

Southwest flow of milder air continues into the region ahead of an
approaching cold front Wednesday morning. Temperatures may reach the
lower to mid 40s, especially for the lake plains and Genesee Valley
into the Finger Lakes. Could see a few showers of rain or rain/snow
mix sneak into the region from the northwest Wednesday morning,
but its not until the afternoon on Wednesday until the deeper
northward push of moisture transport reaches the area within the
background of broadening system relative isentropic ascent
along and immediately ahead of the advancing cold front. This
introduces the initial stage of an expected longer duration
precipitation event.

Wednesday night through Thursday night...

Gradual height falls tied the lead northern stream wave shearing
into central Ontario will draw the system cold front across the area
Wednesday evening into Wednesday night. Sustained ascent driven by
very moist system relative isentropic lift working over the
advancing boundary ensures an expanding coverage of precipitation
commences during this time. Rain may still be the predominant
precipitation time Wednesday evening before steady cooling of the
column allows for a change over to snow from north to south
probably from late evening or around midnight through the overnight.
Transition timing will likely impact accumulating snow potential
Wednesday night and at this point do not see this as the period of
the heaviest snow accumulations although several inches are
certainly possible before morning if the change over occurs early
enough in the night.

At this point in the forecast process believe that the best
potential for widespread accumulating snowfall will be Thursday into
Thursday night as several rounds of stronger ascent continue to
engage the elevated frontal zone. Do see diminishing ascent
commencing late Thursday night. However, north-northeast flow of
incoming arctic airmass will start to bring in some mesoscale
processes with lake response south of Lake Ontario likely coming
into play by the time we reach Friday morning.

Overall snow to liquid ratios starting out very wet in the 6:1 range
transitioning to a more standard 10-12:1 ratio by Thursday night. A
general blend of guidance including the GFS/CMC/EC suggesting a high
likelihood for snowfall total to exceed 9 inches through this time
period with the potential for more as we go into Friday.

18Z Euro

C3BA6584-4071-47EF-9467-DBFA40BA7028.thumb.png.22b7c0d5648a6611a08a060b21eba9f4.png

GFS

sn10_acc.us_ne.png

GEM

sn10_acc.us_ne.png

UK

sn10_acc.us_ne.png

 

 

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BUF:

The 30/12Z run of the ECMWF has again trended further NW and is now
more in line with the GFS and Canadian-NH. Would still like too see
some run to run consistency but a somewhat more clearer picture is
starting to evolve. Again...a lot will ride on the strength of the
sfc high to our northwest and the eventual push of the 850 hPa
thermal boundary (cold front) into and across the region. The next
key will be where it stalls or sets up which will then provide a
path for several waves of low pressure to track along. This boundary
will also determine p-type and snowfall amounts...which could be
significant depending on which side of the boundary you reside.
Right now...its looking like an all snow event for all of our CWA.
The question is just how much...too early to say at this point.
Again...just want to hammer one "big" point home with this update.
As was previously stated...guidance has been all over the board. Its
only been the 30/12Z guidance that has been a little bit more
consistent. Still lots of time for things to change but will start
with adding this potential storm in the HWO. stay tuned!
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HWO

The potential exists for a long duration winter storm to impact the
region Wednesday night into Friday. This system has the potential
to bring significant accumulating snow. Details in forecast track
and exact amounts are still emerging at this time. A more northern
track could also bring the possibility of ice.
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Looking at the eps, reason they are getting bit more amped is they are digging the southern s/w more in the south. Culprit could be pna ridge previously was getting sawed off up near AK due to lower hgts. This lead to a broad ridge which causes more positive tilted trough allowing the cold to run east and less phasing. Last couple runs are losing that which is leading to a more amplified pna ridge allowing for the s/w to dig more. This really flexes the se ridge which in turn shoves the cold air advancement from the clipper more northeast instead of east.  Also, the tpv has trended a bit further north as well which has allowed the se ridge to gain more traction but I think that is merely related to the s/w in the south digging more. Going into these 0z runs, watch the pna, how much energy phases out west, and how strong the southern stream s/w is in the south. It's a catch 22 here, you want a potent storm to bring good qpf, but that also may enhance the se ridge and push the thermal bndry over the region. 

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3 minutes ago, Syrmax said:

Flood watches issued tomorrow in afternoon AFD? Or wait till Tuesday a.m. package? :lmao:

Ha. I guess we'll see what the rest of the 0Z runs show. Nam could be doing it's normal Nam thing....BUT every time it shows us warm and rain it seems to be right. I know I'm supposed to be "positive" but at this point we've gotta look at every possible way we can get screwed, as "this is the way" here it seems anymore. 

Oh, and we KNOW BGM will be all over the Nam...

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2 minutes ago, TugHillMatt said:

...and with all the COLD we've had.... if it ends up rain...and then we cold again.... maddening. 

I follow your weather because I love lake effect snow but what's going on with areas near the lakes.  Many places are way below normal.  Check this out .

Strange that Atlantic city is number 10 and almost up to Syracuse. 

image.webp

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1 minute ago, MJO812 said:

I follow your weather because I love lake effect snow but what's going on with areas near the lakes.  Many places are way below normal.  Check this out .

Strange 

image.webp

The cold air has been so cold and dry, that lake effect has been minimal. The past two winters, we were too warm..now we're too cold. lol

Then, the synoptic track...ugh. Great for Buffalo, Toronto, and Watertown. Southeast of there...meh.

Plus, December was super snowless, so we started off extremely slowly. 

I am just dumbfounded by how awful the winters of recent have been in Syracuse relative to normal. 

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5 minutes ago, TugHillMatt said:

The cold air has been so cold and dry, that lake effect has been minimal. The past two winters, we were too warm..now we're too cold. lol

Then, the synoptic track...ugh. Great for Buffalo, Toronto, and Watertown. Southeast of there...meh.

Plus, December was super snowless, so we started off extremely slowly. 

I am just dumbfounded by how awful the winters of recent have been in Syracuse relative to normal. 

What is your average ? 120?

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3 minutes ago, TugHillMatt said:

The cold air has been so cold and dry, that lake effect has been minimal. The past two winters, we were too warm..now we're too cold. lol

Then, the synoptic track...ugh. Great for Buffalo, Toronto, and Watertown. Southeast of there...meh.

Plus, December was super snowless, so we started off extremely slowly. 

I am just dumbfounded by how awful the winters of recent have been in Syracuse relative to normal. 

I'm dumbfounded too. The only comparable years are 1966-1969. You should feel good that this won't last. You got all the bad years out of the way now. Statistics don't lie.

https://www.tsforecast.com/seasonalsnowfall.html

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1 minute ago, MJO812 said:

What is your average ? 120?

In Northern Onondaga county, it's about 130 to 135 inches. We're sitting at about 47 inches on the season. (As you can see on the table, Syracuse city is 10 inches lower.) Should be around 80 to 85 inches by this time in this part of the county.

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4 minutes ago, BuffaloWeather said:

I'm dumbfounded too. The only comparable years are 1966-1969. You should feel good that this won't last. You got all the bad years out of the way now. Statistics don't lie.

https://www.tsforecast.com/seasonalsnowfall.html

I should, but I don't. I didn't think it would go on a 3rd year. lol

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2 minutes ago, BuffaloWeather said:

Its quite a bit further SE

prateptype.conus.png

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I was comparing it to its 18Z run...not the Nam. But it is definitely much more SE than the Nam...and weaker. Sizzlecuse is the last place to change over north of the front, but whatever.  Thinking the Nam looks way too amped here, and that it's more of a drawn out/possibly overrunning-type setup.

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