I was under the impression that La Niña (the one that cools the ocean) tends to bring milder but wetter winters. This is particularly true during a third consecutive La Niña which is what we have this year.Unfortunately all the signs are for an El Niño/La Niña event this winter, which typically brings much colder winter weather than the average we see in the UK.
Edit: this link explains a little what happens in the UK:
https://www.yourweather.co.uk/news/trending/meteorologists-declare-triple-dip-la-nina-weather.html
Does La Niña affect the UK?
The consequences of La Niña in Europe are much less obvious, with the only clear impact, according to the Met Office, being a tendency for slightly drier than average weather in the Iberian Peninsula during autumn.
In the UK, there is a tendency for La Niña years to favour high pressure in the mid-Atlantic during late autumn and early winter. This can promote intense, cold conditions due to the blocking of the Atlantic weather systems that typically deliver mild air.
Conversely, in late winter, the weather can turn milder as La Niña drives the jet stream closer to the North Pole. This can also result in stormier conditions, with increased rainfall.
This suggests the earlier part of winter and end of autumn will be cooler and the later part will be warmer. Going by the last couple of years of La Nina it has definitely been much warmer than previous winters. Not had to use the heating in London and only had snow on a few days.
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