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December 2023


brooklynwx99
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This is possibly the unspoken fear:

image.png.43a85ecb8ee94f5cee0b7eab76277d4a.png

As long as the formative block strengthens rather than fades after the first week of December or avoids sinking southwestward to the Hudson Bay/James Bay area, there should be some opportunities even if Arctic air doesn't get involved. A breakdown in blocking would result in the development of a milder pattern, especially as the AAM is forecast to go positive starting late in the first week of December. The latter would allow the block to protrude into the Northeast, as has happened at times in recent years, which could suppress the subtropical jet stream. At this point, things are looking more promising than last winter. But beyond two weeks, model skill is low so speculative outcomes beyond mid-December are essentially guesses right now.

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A record breaking 8 warmer than normal winters in a row since the 15-16 super El Niño. Then we have the December warming trend which has the 2nd half of the month warming faster than the first half. This has lead to to regular 55°+ highs around the solstice from December 17th to 25th every year since 2011. The average December 1-15th high in NYC back in 1981 was around 39.6° and only warmed to 41.0° in 2022 for a rise of +1.4. The December 16-31 average temperature rose much more steeply from 35.2° to 39.0° for a large increase of +3.8°. So the late December average temperature in the 2020s is nearly the same as the early December temperature in the early 1980s. 

Snowfall has been much more variable and has been in all or nothing mode. Great outcomes from 15-16 to 17-18. Then a significant drop from 18-19 to 22-23. But we did have the great 20-21 season across the region and the January 22 record snows on Long Island. Forecasts for snow  need to make it into the 120 hr or lower forecast period to be believable since we have had so many day 6-10 and 11-15 patterns which looked snowy that never verified.
 

NYC

Feb 23…+5.2

Jan 23…+9.8

Dec 22…-0.6

…………..+4.8

 

Feb 22….+1.4

Jan 22….-3.2

Dec 21….+4.7

……………..+1.0

 

Feb 21….-1.7

Jan 21….+1.1

Dec 20…+1.7

…………..+0.4

 

Feb 20…+4.8

Jan 20….+6.5

Dec 19….+0.8

…………….+4.0

 

Feb 19….+0.9

Jan 19….-0.1

Dec 18…+2.6

…………….+1.1

 

Feb 18…+6.7

Jan 18….-0.9

Dec 17…..-2.5

…………….+1.1

 

Feb 17…..+6.3

Jan 17….+5.4

Dec 16….+0.8

…………….+4.2

 

Feb 16….+2.4

Jan 16….+1.9

Dec 15….+13.3

…………….+5.9

 

 

Time Series Summary for NY CITY CENTRAL PARK, NY
Click column heading to sort ascending, click again to sort descending.
Ending Date
Highest Max Temperature Dec 17 to Dec 25
Missing Count
2022-12-25 58 0
2021-12-25 60 0
2020-12-25 61 0
2019-12-25 57 0
2018-12-25 61 0
2017-12-25 55 0
2016-12-25 58 0
2015-12-25 72 0
2014-12-25 62 0
2013-12-25 71 0
2012-12-25 56 0
2011-12-25 62 0
2010-12-25 40 0
2009-12-25 39 0
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16 hours ago, donsutherland1 said:

This is possibly the unspoken fear:

image.png.43a85ecb8ee94f5cee0b7eab76277d4a.png

As long as the formative block strengthens rather than fades after the first week of December or avoids sinking southwestward to the Hudson Bay/James Bay area, there should be some opportunities even if Arctic air doesn't get involved. A breakdown in blocking would result in the development of a milder pattern, especially as the AAM is forecast to go positive starting late in the first week of December. The latter would allow the block to protrude into the Northeast, as has happened at times in recent years, which could suppress the subtropical jet stream. At this point, things are looking more promising than last winter. But beyond two weeks, model skill is low so speculative outcomes beyond mid-December are essentially guesses right now.

97/98 has been my fear all along. We seem to be in a multi-year period of west coast, central u.s. troughing which could be expected after the long 2000 through 2018 epic period. 

surprised this pac has not improved given the recent MJO forcing.

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3 hours ago, EastonSN+ said:

97/98 has been my fear all along. We seem to be in a multi-year period of west coast, central u.s. troughing which could be expected after the long 2000 through 2018 epic period. 

surprised this pac has not improved given the recent MJO forcing.

Ongoing marine heatwaves are distorting the atmospheric response.

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1 minute ago, Allsnow said:

In the 11-15 day range. How many times have we been though this? 

what exactly else would you like to use? the upcoming pattern looks great. if it was warm, people would have no question about it being right. it’s a silly argument

the blocking develops inside day 5. the features that force this pattern are moving into the short range

IMG_3580.thumb.png.72dc11e9caed0d8a498113f2b990eea1.png

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Those 12z/25 ensembles are not yet responding with only T-1" snow LI on GEFS/EPS and nil CMC.  

Still, there is hope.

One negative I see is repeated CFP's with low pressure probably averaging Canadian Maritimes-Southeast Canada...best hope might be the 5th... I'd like to see a lot more digging on the short wave vort max's ...they look a little too far north for me (mainly north of 40).  So far the 330PM 11/25 CPC 6-10, 8-14 day not budging much on temps here...still aoa.   CPC has no sig hazards in the northeast yet for Dec 2-8.  

Hoping for model adjustments to convince me on snow events moving south to 40N into our area between 12/5-10. I can't visualize anything beyond that---not a long ranger.  More of a modelologist as someone has mentioned. I can't outguess the week 1-2 ensembles. 

 

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23 minutes ago, brooklynwx99 said:

what exactly else would you like to use? the upcoming pattern looks great. if it was warm, people would have no question about it being right. it’s a silly argument

the blocking develops inside day 5. the features that force this pattern are moving into the short range

IMG_3580.thumb.png.72dc11e9caed0d8a498113f2b990eea1.png

It's a great thing that the ensembles are showing a good pattern ahead. We should all be pretty excited how this winter might be turning out to be .

 

Even the meteorologists on Twitter who were going with a warm December are now backtracking because of the MJO.

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2 hours ago, brooklynwx99 said:

what exactly else would you like to use? the upcoming pattern looks great. if it was warm, people would have no question about it being right. it’s a silly argument

the blocking develops inside day 5. the features that force this pattern are moving into the short range

IMG_3580.thumb.png.72dc11e9caed0d8a498113f2b990eea1.png

Are you on X (formerly known as Twitter)?

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