Half-horsepower Persian Snows

Sunrise's Swansong

A strong west-to-east flow across northern Europe is driving polar Atlantic air deep into Siberia. (Maps below are created by Dr Ryan Maue from GFS initial data, and are among thousands of maps he makes available at the Weatherbell site.) (Click maps to clarify and enlarge.)

Persia 1 gfs_mslp_uv10m_eur_6

This air is actually quite mild for December (although below freezing by the time it gets to Russia. Below freezing appears as pink on the map below.)Persia 2 gfs_t2m_eur_1

To get a feel for how above-normal the air actually is a temperature anomaly map is helpful. The map below shows temperatures are most above normal in Finland.Persia 3 gfs_t2m_anom_eur_1

This surge of relatively mild (but still below freezing air) will extend far across Asia, but does not represent the very cold (-40°C) Siberian air being warmed, but rather replaced. The displaced air is pushed north into the Arctic Sea, or west into the Pacific, or south and then…

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