A split event in polar vortex is forecast(ed) for 8 Feb. 2026
[image: 1769272379661-b2fab2ee-5687-4133-9cc9-303005c9f042-%CE%B5%CE%B9%CE%BA%CF%8C%CE%BD%CE%B1.png]
We'll keep an eye on it!
Also we can track for sudden stratospheric warming,
here: https://ds.data.jma.go.jp/tcc/tcc/products/clisys/STRAT/
P.S. The warming is called a "Minor Warming", when the polar temperature increases more than 25 degrees in a period of a week or less at any stratospheric level.
https://ds.data.jma.go.jp/tcc/tcc/products/clisys/STRAT/readme.html