In reply to Phil Lyon:
It's basically a fairly active low pressure system, you can see it marked on the midnight chart here
https://www.metoffice.gov.uk/weather/maps-and-charts/surface-pressure
When you have a very sharp wind veer like you are seeing here, it's generally indicative of a fairly active front, which basically means to expect more intense precipitation and a spell of strong gusty winds as the front moves over you.
The reason it's so marked in this case is partly do to the temperature contrast. If you look at the chart and follow the isobars back to see where the air is coming from, you can trace the warm sector air (i.e. the air following behind the red warm front) back to the tropical Atlantic/Sahara, while the cold air on the other side of the low has come from northern Canada (that's a bit trickier to tell, but you can trace it back by looking at previous charts here https://www.wetterzentrale.de/reanalysis.php?map=1&model=bra&var=45... )
The other reason is that there is a deep trough in the pressure pattern up at the jet stream level extending south from Greenland. This is engaging with the low pressure at the surface, enhancing the uplift of air in the low and deepening the low pressure system. You can kind of see it if you move the level slider from surface to 300 hPa.