The development of low pressure in the western Atlantic continues to be fueled by cold air flowing in from the north. The result is a more or less stationary, pronounced low south of Greenland. On the one hand, this produces an "active Atlantic" in weather terms and constantly new disturbances that reach us with the westerly drift - as has happened in recent days (and triggered the current PowderAlert).
On the other hand, warm air is transported northwards at the front of this low, which is conducive to a strengthening of the somewhat shifted Azores High. The series of cold and warm fronts that have been and will be unleashed on the northern and western Alps - with corresponding temperature jumps and sometimes very critical avalanche situations - testify to the current dominance of the westerly weather.
