Mika Rantanenさんのイラストまとめ

Looks like the positive Arctic Oscillation (+AO) pattern anticipated by long-range models is now starting to materialize in medium-range. 👀

Strong #Föhn situation coming for Thursday as the atmospheric flow is forced to squeeze between an anomalous ridge-trough couplet over the Scandes.

Well, this is interesting.

The new ECMWF seasonal forecast has very strong NAO+ signal for the rest of the winter.

Pretty much an opposite circulation regime than so far.

https://t.co/rWATUBJnQI

Voi olla että Taalaksella on ollut jokin muu attribuutiotutkimus lähteenä kuin tuo linkattu.

Mutta pointti on se, että #ilmastonmuutos voimistaa, pahentaa, edesauttaa.

Se voi olla yksi palapelin palanen, mutta ei koko sääilmiön syy. Ainakaan vielä.

https://t.co/oOmZKASdoi

These extremely cold-core lows are associated with dry Arctic air. Because of that, they usually don't have much precipitation (snowfall).

However, southward tracking TPVs are better known for the cold air outbreaks they cause, especially in North America.

@autio_pasi @KorpikoskiMarko @HarriHakulinen Meinaatko että ympyrän alueella väri muuttuu takaisin valkoiseksi, mutta muualla maapallolla ei?

Enjoy the cold. Next week it's gone.

Wow. Naimakka, Sweden dropped to -40.9°C this morning. ❄️🥶

First -40°C of the season in the Nordics.

Figures via @meteociel (https://t.co/8dBxKdiGgK) and @SMHIvader (https://t.co/TiOxJPRM7f)

GEFS days 12-16. Could it be more classic NAO+ pattern?

The cold spell in the Nordics will intensify over the weekend as even colder air mass flows over the region.

Pretty harsh start to the meteorological winter!