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December 2020 General Discussions & Observations Thread


bluewave
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4 hours ago, bluewave said:

The warm pools where the East and West Coast ridges keep getting stuck really stand out. It also looks like the warm blob in the eastern IO could be why  the MJO has been stalling near phase 4. That North Atlantic SST pattern may also be working in tandem with the PV to make the long range -NAO forecasts biased too negative.

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question Chris pretty basic....why dont those warm and cold pools mix and even out the temperatures across the Pacific?

 

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6 minutes ago, MJO812 said:

Pattern changes to what ?

Nina Pacific run garbage which means cutters and the huge SE ridge. Dec into early Jan is our shot IMO for this winter, and this probably ends up as a strong Nina. The system behind this one could've had a shot but looks like too much wave interference along with this one not being far enough gone to work. Even the 10-11 Nina winter pretty much ended after the 1/27/11 storm. Nina winters are front loaded here. 

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2 hours ago, jm1220 said:

Nina Pacific run garbage which means cutters and the huge SE ridge. Dec into early Jan is our shot IMO for this winter, and this probably ends up as a strong Nina. The system behind this one could've had a shot but looks like too much wave interference along with this one not being far enough gone to work. Even the 10-11 Nina winter pretty much ended after the 1/27/11 storm. Nina winters are front loaded here. 

why is it that everyone yaps about la ninas being so cool on a global level and we always get screwed over by them unless they are weak and come after an el nino the previous winter?

 

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The next 8 days are averaging 40degs.(36/44).        Making it 35degs., or about -3.0.

The three main models are all snowless for their durations.

47*(99%RH) here at 6am, rain.      44* by 8am.     42* by 9am.        46* by 2pm with clearing skies.         48* by 3pm.        49* at 3:15pm.      46* at 4pm.      45* at 5pm.     41* by 8pm.

 

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12 hours ago, bluewave said:

The warm pools where the East and West Coast ridges keep getting stuck really stand out. It also looks like the warm blob in the eastern IO could be why  the MJO has been stalling near phase 4. That North Atlantic SST pattern may also be working in tandem with the PV to make the long range -NAO forecasts biased too negative.

2FE5FD56-5362-4677-A336-0BBA28492E56.thumb.jpeg.f47e8459f2ddee1a0ef3f418711872ef.jpeg

 

 

The Niña associated Aleutian ridge is showing up on all ensemble guidance now, all the new runs of EPS, GEPS, GEFS have it

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Morning thoughts...

Today will be rainy and cool. Temperatures will likely top out in the lower and middle 40s this morning or early this afternoon in most of the region. Likely high temperatures around the region include:

New York City (Central Park): 45°

Newark: 45°

Philadelphia: 46°

The storm will likely bring accumulating snow to parts of New England, but will be a “near miss” for most of the Middle Atlantic region into southern New England. 

Final Snowfall Estimates:

Boston: 3”-6”

Caribou: 8”-14”

Concord: 6”-12”

Hartford: 2”-4”

Portland: 4”-8”

Providence: 2”-4”

Worcester: 7”-14”

In the wake of today’s storm, a period of colder weather will follow.

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4 hours ago, LibertyBell said:

why is it that everyone yaps about la ninas being so cool on a global level and we always get screwed over by them unless they are weak and come after an el nino the previous winter?

 

La NIna favors New England like the storm we are seeing today.  Hopefully we get lucky with Miller B storms as we head into winter .

The last really good Nina in our area was in 2010-2011 thanks to blocking.

64 inches here for the winter 

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5 minutes ago, MJO812 said:

La NIna favors New England like the storm we are seeing today.  Hopefully we get lucky with Miller B storms as we head into winter .

The last really good Nina in our area was in 2010-2011 thanks to blocking.

64 inches here for the winter 

As a side note, moderate nina = big trouble for the south when spring comes around.

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10 minutes ago, donsutherland1 said:

One dominated by Pacific flow.

There is now consensus among the ensembles that the TPV moves into AK (+EPO) come next weekend. It’s probably lights out for awhile, that’s a stable pattern, the vortex is not going to be in a big rush to move out

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7 minutes ago, crossbowftw3 said:

As a side note, moderate nina = big trouble for the south when spring comes around.

In conjecture with this, some crazy impressive analogs have been tossed around, which include both super outbreak years, and 2008 (Super Tuesday, early January Outbreak being among most notable). Not to say events of those magnitudes occur but overall it paints a very ugly picture 

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18 minutes ago, donsutherland1 said:

One dominated by Pacific flow.

Hey Don hate to bother, however once the pattern flips to Pacific flow dominace do you feel that we will have "breaks" in the pattern favorable to cold/snow in Jan and Feb, or so you believe we are heading towards a 2011 2012 type pattern stability? 2016 2017 would be a good example of the former. For the latter of course with the "fluke" scenario and March volatility taken aside.

The reason I personally feel better about this winter is the warm pool in the NE Pacific and the blocking that for some reason is showing itself.

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17 minutes ago, EastonSN+ said:

Hey Don hate to bother, however once the pattern flips to Pacific flow dominace do you feel that we will have "breaks" in the pattern favorable to cold/snow in Jan and Feb, or so you believe we are heading towards a 2011 2012 type pattern stability? 2016 2017 would be a good example of the former. For the latter of course with the "fluke" scenario and March volatility taken aside.

The reason I personally feel better about this winter is the warm pool in the NE Pacific and the blocking that for some reason is showing itself.

I think we will get some breaks. I would be surprised if there are no additional periods where there is opportunity for some cold and snow.

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42 minutes ago, MJO812 said:

La NIna favors New England like the storm we are seeing today.  Hopefully we get lucky with Miller B storms as we head into winter .

The last really good Nina in our area was in 2010-2011 thanks to blocking.

64 inches here for the winter 

The 10-11 La Niña was extremely “east-based” at the beginning of winter, November and December. If you recall, as it evolved to become more “west-based” around mid-January, the high latitude blocking began to slowly breakdown, then it completely fell apart at the end of January and that was all she wrote for that winter, the blocking never came back again, right through April.....

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4 minutes ago, snowman19 said:

The 10-11 La Niña was extremely “east-based” at the beginning of winter, November and December. If you recall, as it evolved to become more “west-based” around mid-January, the high latitude blocking began to slowly breakdown, then it completely fell apart at the end of January and that was all she wrote for that winter, the blocking never came back again, right through April.....

NYC would have broke the all time snow record which was set in 1996 if the pattern didn't fall apart. I had 60 inches by Feb 1.

Blocking fell apart in the 2nd half of winter and thats when the LA Nina went rampant.

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8 minutes ago, bluewave said:

This would have been a good opportunity if we had a cold November like the last few years. But there was no cold around for this storm following the warmest November on record. We had more cold to start last December so NYC was able to at least pick up 1.6”.  But this will be the 2nd December in a row that  areas far enough north get an impressive first week of December snow. 

The storm last December was a big bust.

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