Mika Rantanenさんのイラストまとめ

@vphakanen Hyvä kysymys! musta käyrä on 30-vuotinen liukuva keskiarvo, ja se on keskitetty, eli kuvaa edellisen ja seuraavan 15 vuoden keskiarvoa. Siksi se päättyy 2008.

jos globaalisti katsoo, niin viimeisen 50v. aikana eniten ovat lämmenneet Arktis ja mantereet, siis keväisin.

@HilppaGregow This is the whole area which I downloaded from CDS.

The maps shows how much the monthly maximum T850 in May have changed in 1950-2021 (the difference of the end points of the linear trends)

@mackke91 Laaja yläsola ja siihen liittyvä pintamatala on parkkeerannut Suomen itä- ja koillispuolelle. Lännessä on korkea. Niiden välistä virtasi tiistaina kylmää ilmamassaa, mikä nyt tuulen tyyntyessä näkyy kylminä aamuina.

It's not often you see T850 < -18°C (Arctic airmass) in Finland in the end of April. Pretty chilly days expected in Lapland!

Comparison of the situations using @burgwx percentile products: https://t.co/V1axyxromJ

The next 7-10 days looks almost completely dry in Finland as the high pressure strengthens over the Baltic region.

The atmosphere trying its best to compensate for the record-wet February.

Classic omega-shaped blocking seems increasingly likely next week and beyond.

This would mean even more this kind of beautiful and sunny late winter / early spring days as now. ☀️

Visualisation of the climatological longest continuous period of snow cover, based on the 1991-2020 average.

It's been relatively snow-rich winter in Finland.

Typically, the longest continuous snow cover lasts ~100 days in southern Finland, but unfortunately the rate at which it has decreased is one of the fastest of the whole northern hemisphere.

Widespread warmth relative to long-term averages expected in northern Eurasia.

This is fairly typical pattern following the strong polar vortex events, as shown by the composite charts of Tripathi et al. (2015): https://t.co/vFTCTKKEFf