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December 2023


brooklynwx99
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3 hours ago, snowman19 said:

 

It doesn’t matter anymore whether we have an El Niño like this December or a La Niña like last January. We keep getting these  ridiculous Pacific Jet extensions that bring record warmth to North America. My guess is that all the warmth in the Western to Central Pacific MJO regions are driving this phenomenon. This time with the orientation in the ridge, the warmest departures will probably line up further west than last January. But even in a warming planet, it’s noteworthy to get two consecutive winters with monthly departures so high for the North American continent.

A7EEE8CC-BC1A-474E-85E9-8D432A08AF31.thumb.png.a0e8044bd564d2500f968987b4491933.png
8A16CCF5-0E5D-4DC1-BEFE-4CE006D5A91B.thumb.png.811832801772ca92f9423fd27bb1d655.png6D0D974F-106A-4AB7-B5C1-B85578C1F1B7.thumb.png.736f994c05e468515439e5864eaa6e59.png


83E4001A-0AA6-4FD8-BCAD-89CCBF0961FC.png.b8f574240b3aa999de65aedc50d8f86c.png

 

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It doesn’t matter anymore whether we have an El Niño like this December or a La Niña like last January. We keep getting these  ridiculous Pacific Jet extensions that bring record warmth to North America. My guess is that all the warmth in the Western to Central Pacific MJO regions are driving this phenomenon. This time with the orientation in the ridge, the warmest departures will probably line up a bit further west than last January. But even in a warming planet, it’s noteworthy to get two consecutive winters with monthly departures so high for the North American continent.
A7EEE8CC-BC1A-474E-85E9-8D432A08AF31.thumb.png.a0e8044bd564d2500f968987b4491933.png
8A16CCF5-0E5D-4DC1-BEFE-4CE006D5A91B.thumb.png.811832801772ca92f9423fd27bb1d655.png6D0D974F-106A-4AB7-B5C1-B85578C1F1B7.thumb.png.736f994c05e468515439e5864eaa6e59.png

83E4001A-0AA6-4FD8-BCAD-89CCBF0961FC.png.b8f574240b3aa999de65aedc50d8f86c.png
 

Eric Webb (love him or hate him) makes an interesting point, is AGW making the warmth even more dramatic?

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Here you can see the slow down in 6/7 like the OLR maps were showing days ago 
 
 
IMG_2699.png.e22ef81684234b973f0f0fcbd60bdd29.png

As suspected, once the MJO gets into phase 7, it constructively interferes with the El Niño standing wave and slows down. Expect the associated WWB to also increase in strength as we get closer in time. This is almost certainly going to result in substantial warming of Nino regions 3 and 3.4 at the end of this month….it has a lot of warmth in the subsurface and OHC to work with…..
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8 minutes ago, the_other_guy said:

can we establish that the linear conclusion between MJO and the type of winter weather you expect has been disrupted by AGW?

 

it seems that guys that are relying on  MJO phases for pattern changes have been shooting blanks for the past few years.

I began to suspect it after seeing the extreme warmth in December 2015 when we had a record MJO 5 for a super El Niño. But we recently got confirmation in 2019 that this is the case. It’s not just chance that we have had 8 warmer than normal winters in a row which never happened before. 
 

https://www.nature.com/articles/s41586-019-1764-4

Twofold expansion of the Indo-Pacific warm pool warps the MJO life cycle

Nature volume 575pages 647–651 (2019)Cite this article

Abstract

The Madden–Julian Oscillation (MJO) is the most dominant mode of subseasonal variability in the tropics, characterized by an eastward-moving band of rain clouds. The MJO modulates the El Niño Southern Oscillation1, tropical cyclones2,3 and the monsoons4,5,6,7,8,9,10, and contributes to severe weather events over Asia, Australia, Africa, Europe and the Americas. MJO events travel a distance of 12,000–20,000 km across the tropical oceans, covering a region that has been warming during the twentieth and early twenty-first centuries in response to increased anthropogenic emissions of greenhouse gases11, and is projected to warm further. However, the impact of this warming on the MJO life cycle is largely unknown. Here we show that rapid warming over the tropical oceans during 1981–2018 has warped the MJO life cycle, with its residence time decreasing over the Indian Ocean by 3–4 days, and increasing over the Indo-Pacific Maritime Continent by 5–6 days. We find that these changes in the MJO life cycle are associated with a twofold expansion of the Indo-Pacific warm pool, the largest expanse of the warmest ocean temperatures on Earth. The warm pool has been expanding on average by 2.3 × 105 km2 (the size of Washington State) per year during 1900–2018 and at an accelerated average rate of 4 × 105 km2(the size of California) per year during 1981–2018. The changes in the Indo-Pacific warm pool and the MJO are related to increased rainfall over southeast Asia, northern Australia, Southwest Africa and the Amazon, and drying over the west coast of the United States and Ecuador

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I began to suspect it after seeing the extreme warmth in December 2015 when we had a record MJO 5 for a super El Niño. But we recently got confirmation in 2019 that this is the case. It’s not just chance that we have had 8 warmer than normal winters in a row which never happened before. 
 

https://www.nature.com/articles/s41586-019-1764-4

Twofold expansion of the Indo-Pacific warm pool warps the MJO life cycle

Nature volume 575, pages 647–651 (2019)Cite this article

Abstract

The Madden–Julian Oscillation (MJO) is the most dominant mode of subseasonal variability in the tropics, characterized by an eastward-moving band of rain clouds. The MJO modulates the El Niño Southern Oscillation1, tropical cyclones2,3 and the monsoons4,5,6,7,8,9,10, and contributes to severe weather events over Asia, Australia, Africa, Europe and the Americas. MJO events travel a distance of 12,000–20,000 km across the tropical oceans, covering a region that has been warming during the twentieth and early twenty-first centuries in response to increased anthropogenic emissions of greenhouse gases11, and is projected to warm further. However, the impact of this warming on the MJO life cycle is largely unknown. Here we show that rapid warming over the tropical oceans during 1981–2018 has warped the MJO life cycle, with its residence time decreasing over the Indian Ocean by 3–4 days, and increasing over the Indo-Pacific Maritime Continent by 5–6 days. We find that these changes in the MJO life cycle are associated with a twofold expansion of the Indo-Pacific warm pool, the largest expanse of the warmest ocean temperatures on Earth. The warm pool has been expanding on average by 2.3 × 105 km2 (the size of Washington State) per year during 1900–2018 and at an accelerated average rate of 4 × 105 km2(the size of California) per year during 1981–2018. The changes in the Indo-Pacific warm pool and the MJO are related to increased rainfall over southeast Asia, northern Australia, Southwest Africa and the Amazon, and drying over the west coast of the United States and Ecuador

What does this mean for people who don’t speak nerd?


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8 minutes ago, Brian5671 said:

maybe we get some cold mid Jan into mid Feb and a storm or two but looks like this wont be a big winter now that December and into early Jan look to be toast...

Toast?? LOL. a bit of an exaggeration, but I do think the snow comes in January.

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11 minutes ago, Brian5671 said:

maybe we get some cold mid Jan into mid Feb and a storm or two but looks like this wont be a big winter now that December and into early Jan look to be toast...

if the second part of that statement confirms, the first part will confirm. Which, doesnt say much, but says it all…

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20 minutes ago, Brian5671 said:

you owe some apologies around here.....

stop this bs. this is why people are so turned off by this forum.

 

He doesn’t owe an apology to anybody. he’s looking at charts and posting what he sees. You already writing off Winter until January 15 like you have a clue.

Should I call you out if we get snow on January 3?

 

Ridiculous

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1 hour ago, bluewave said:

Higher ocean heat content is increasing the convection in the warmer MJO phases.

It's not restricted to the warmer MJO phases.  In general, our Oceans are very, very warm.   We are increasingly breaking single day precipitation event records as a result of warmer temperatures as a consequence of, in part, higher oceanic heat content. 

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3 hours ago, snowman19 said:

The overnight model runs have gotten even stronger with the PAC jet late month. This is pretty incredible
 

 

 

 

 

Such jet streaks often develop during moderate or strong El Niño events and high amplitude passage of the MJO through Phases 5-6-7. Below is a composite of Phase 5 (amplitude 1.5 or above) and El Niño Region 3.4 anomaly of 1.0 or above and then rolled forward five days.

Day 0:

image.gif.8659986a99ad8e9293f424b20dca874f.gif

Day 1:

image.gif.a68b3d6812686edc404961fe61e283c4.gif

Day 2:

compday.xnFbhV7Pcq.gif

Day 3:

image.gif.335d9871423804586fafe390d9a7fe70.gif

 

Day 4:

image.gif.3f32e02ece6c85856d9521fdbbbb28a5.gif

Day 5:

image.gif.264cae052646e41b121af42440bea30e.gif

 

 

 

 

 

 

 

 

 

 

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5 minutes ago, SnoSki14 said:

So we might not see any more snow events if that's the case. 

You see this is the problem with this forum. Bluewave is vey smart but does have a warm bias. Posting red maps over and over again doesn't mean it's not going to snow anymore. LOL..It's a December strong nino..they all turn out mild and snowless.No big surprise here.Maybe we'll see something in January, February and March. 

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