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After this, forecast confidence decreases with an active weather
pattern developing across the area. Long range model guidance is in
general agreement that sharp trough will evolve into a mid-level cut-
off low somewhere near our area. This is likely to bring a soaking
rainfall to the region Thursday into Thursday night.

This will, eventually, be followed by much colder weather as this
system slides to our east and brings in colder air with 850 mb
temperatures dropping to around -15c by Saturday. However, model
guidance is in poor agreement how we get there, making the Christmas
eve/Christmas Day forecast a low confidence one. There are
differences in both timing and track of the system which are
unlikely to be resolved for at least a couple of days. For example
the 00Z GFS is faster with the system with temperatures in the lower
20s on Christmas Day, while the slower/west GGEM has temperatures in
the 50s. Since warm weather on Wednesday and Thursday should melt
the snow on the ground at most locations, the evolution of this
system will determine if there will be any snow on the ground for
Christmas morning. Stay tuned...

Multi-model and ensemble consensus along with standard deviation
anomaly charts favor a massively anomalous event in the period
staring Christmas eve and extending through Christmas. A negatively-
tiled mid-level short wave looks to advance northeastward toward the
area in a strengthening and highly-curved upper jet pattern.
Although location is uncertain, this has the potential to produce 2+
inches of rain somewhere in the northeastern states. There`s also a
potential for a convective shower-line with gusty winds, however 00Z
model guidance has shifted the best chance for this to the south and
east of our region.

Looking ahead to next weekend, there is little doubt that it will be
much colder, supporting the potential for lake effect snow. It`s too
early to pin down location yet, but significant accumulations are
possible.
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54 minutes ago, Flying MXZ said:

-9 the low here. I’d advise caution to anyone looking at the GFS for details. It was the worst model for this last storm, constantly showing the storm the further south and East and I think we all know where the storm went. 

Well so was the European lol Which showed a tenth of inch of precip for ksyr within 24 hours and that area picked up 6"-8".. Actually the tracks on all the models were pretty similar it was how much precipitation made it north that was the issue..

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19 minutes ago, wolfie09 said:

After this, forecast confidence decreases with an active weather
pattern developing across the area. Long range model guidance is in
general agreement that sharp trough will evolve into a mid-level cut-
off low somewhere near our area. This is likely to bring a soaking
rainfall to the region Thursday into Thursday night.

This will, eventually, be followed by much colder weather as this
system slides to our east and brings in colder air with 850 mb
temperatures dropping to around -15c by Saturday. However, model
guidance is in poor agreement how we get there, making the Christmas
eve/Christmas Day forecast a low confidence one. There are
differences in both timing and track of the system which are
unlikely to be resolved for at least a couple of days. For example
the 00Z GFS is faster with the system with temperatures in the lower
20s on Christmas Day, while the slower/west GGEM has temperatures in
the 50s. Since warm weather on Wednesday and Thursday should melt
the snow on the ground at most locations, the evolution of this
system will determine if there will be any snow on the ground for
Christmas morning. Stay tuned...

Multi-model and ensemble consensus along with standard deviation
anomaly charts favor a massively anomalous event in the period
staring Christmas eve and extending through Christmas. A negatively-
tiled mid-level short wave looks to advance northeastward toward the
area in a strengthening and highly-curved upper jet pattern.
Although location is uncertain, this has the potential to produce 2+
inches of rain somewhere in the northeastern states. There`s also a
potential for a convective shower-line with gusty winds, however 00Z
model guidance has shifted the best chance for this to the south and
east of our region.

Looking ahead to next weekend, there is little doubt that it will be
much colder, supporting the potential for lake effect snow. It`s too
early to pin down location yet, but significant accumulations are
possible.

Who uses the GGEM?!?!?!

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7 minutes ago, Thinksnow18 said:

Who uses the GGEM?!?!?!

Nws uses the"big 3" Gfs, Canadian and european.. As of right now the GFS is the only model spitting out synoptic snows, GGEM,EURO, Icon all west..The 6z gfs jumped a little west as well..

Edit: 0z icon was actually east of previous runs, still warm and rainy verbatim..

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31 minutes ago, vortmax said:

Massively anomalous event starting Christmas eve. Man, we better get a white Christmas this year! Not digging the more westward trend. 

Based on recent history 50F and raining on Christmas doesn't seem anomalous at all.

In fact the most likely forecast for Christmas 2021 is currently to be 50F and raining..........

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Got down to -2°. Finally finished the dig out last night, just moved here and didn't have time to get a snow blower (so many other things needed and $$) didn't think I'd get 3' either had to shovel the entire sidewalk, yard approaching garage and the worst was the driveway. Had to walk out each shovelful too. What a nightmare lol. Definitely worth it though as it was possibly the best event of my life right up there with 96, boxing day, and Jan 2016.

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1 minute ago, rochesterdave said:

Seems the excitement might be over. 

We jump WAAAAAAYYYY too much from one model run to the other...what do the ensembles show? Plus the GFS has been consistent the last few runs...the euro has shown 3 different scenarios in this timeframe...as Aaron Rogers once famously quipped, R E L A X

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40 minutes ago, Thinksnow18 said:

We jump WAAAAAAYYYY too much from one model run to the other...what do the ensembles show? Plus the GFS has been consistent the last few runs...the euro has shown 3 different scenarios in this timeframe...as Aaron Rogers once famously quipped, R E L A X

I am and will continue to model hug. Even 8 days out, if a 6 or 18z iteration calls the storm off- it’s off. Same the other way. If kuchera shows two feet, two weeks out- it’s good. If not. Bad. Hahaha! 

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2 minutes ago, Thinksnow18 said:

But obviously I’m twice as geeked at the plume of LES right up the gut of Lake Erie smiling the metro and the northern burbs...that has also been consistent...this storm is only 5 days away...

5 days is an eternity in model land, example the storm just a few days ago. The good thing is the signal is there for a big event and that has been rather consistent run after run but small changes can have big impacts especially when your dealing with rain vs snow from the storm riding up the front and where it ends up north of us in Canada will have an impact on the wind direction. I think this could be a great set up both synoptically and lake effect but I also could see a scenario the storm cuts more to our west and lands up over us then due north of us causing us rain from the storm along the front and a wind that’s more Westerly\WNW as the storm goes north of us. I won’t feel more comfortable until Sunday night and even that’s pushing it. 

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