One possible result of weather patterns being simultaneously pushed toward blocking highs in the Arctic & an enhanced jet stream is a succession of lows racing into Europe, bringing bouts of wet & windy weather in the 1st half of December.

Not a scenario I'm keen to experience.

The past month's extended ECMWF ensemble sets for the (60N) zonal mean zonal wind at 10 hPa in late November through December.

The signal for a major sudden stratospheric warming event strengthens through 12th Nov, then abruptly takes on a 'reflective' appearance on 19th Nov...

The trend in the ECMWF ensemble has me wondering how much we can trust the recent consensus for predominantly mild weather to persist across northern Europe beyond next ~Friday.

Note the trough digging down across western Europe more, with higher SLP to the north.