Anomalous upper level ridge (left) across Western Siberia responsible for temperatures exceeding 20°C above average (right) this week. Quite an extreme event.

[Maps from https://t.co/mLOBxjHI1Q and https://t.co/3ktgI4YE1j] pic.twitter.com/tE1EHsHJjW

— Zack Labe (@ZLabe) May 20, 2020