Vibes haven’t been better this winter.
We’re certainly setting ourselves up very nicely in the long run by nuking the Aleutian ridge with a +EAMT event.
The -NAO should stick around for a while as well with the circulation anomalies from November & early December’s stratospheric warming event propagating deep into the troposphere.
Also, the subtropical jet is alive & kicking.
View attachment 179831
The ChatGPT explanation/translation of this one is really great. Highly suggest reading it
https://chatgpt.com/s/t_694d4b167204819197f1a05ac7d3d2b4
Some quotes:

What is EAMT?
EAMT = East Asian Mountain Torque
This is a measure of how atmospheric winds interact with major mountain ranges (Himalayas, Tibetan Plateau, etc.)
- When winds hit mountains, they transfer momentum into the atmosphere.
- That momentum then propagates downstream through the jet stream.
Think of it like:
A shove given to the atmosphere over Asia that later shows up over the Pacific and North America.

What does a +EAMT event do?
A positive EAMT event typically:
- disrupts the Pacific jet,
- breaks down stubborn ridges (like the Aleutian ridge),
- promotes pattern reorganization across the hemisphere.
So when they say:
“Nuking the Aleutian ridge”
They mean:
- The ridge is being weakened, flattened, or displaced
- The Pacific jet is becoming more dynamic and flexible
- This allows better downstream pattern evolution
Why that’s good:
You want ridges and troughs to move and evolve, not get stuck.
What is a stratospheric warming (SSW)?
A Sudden Stratospheric Warming happens when:
- the polar stratosphere rapidly warms,
- the polar vortex weakens or deforms,
- high-latitude blocking becomes more likely afterward
This doesn’t affect the surface immediately.

“Propagating deep into the troposphere”
This means:
- The disruption started high in the atmosphere
- It is now working its way downward
- Eventually influencing:
- jet stream position,
- blocking patterns,
- surface weather.
This downward influence can last weeks, sometimes over a month.
Key idea:
Stratospheric events don’t flip patterns overnight — they bias them for an extended period.
So they’re saying:
- The -NAO is being reinforced from above
- It’s not just a model blip
- It has structural support