Underground train fills with water as part of China suffers 'heaviest rain in 1,000 years'

[BumRushDaShow]

21. Yup

that is the prevailing theory.

The melting has impacted the PV (Polar Vortex) that spins around up at the poles and displaces lobes of it at times in what is called a "sudden stratospheric warming" event, and that in turn causes dips in the flow of the (northern) jetstream, in some cases, significantly. When that happens, it results in a ripple that causes the formation of a "ridge" over other areas, that allows warmer than normal air to flow over them, while the colder than normal air flows into the dips.

There have been a few recent periods where the arctic ice was able to regenerate but overall this year has been pretty bad.