In January 2019, an episode of extreme, record-breaking snowfall hit the northern part of the Alps. The event was linked to persistent North Atlantic blocking, which transported moisture from the North Atlantic towards the Alps. At the same time, the polar vortex was displaced over the North Atlantic, split, and a major sudden stratospheric warming occurred. We discuss the possible role of blocking in the polar vortex split and the onset of the sudden stratospheric warming as well as its implications in predicting the snowfall event.

中文翻译：

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2019 年 1 月的高山大雪与大气阻塞有关

2019 年 1 月，一场破纪录的极端降雪袭击了阿尔卑斯山北部。该事件与持续的北大西洋阻塞有关，后者将水分从北大西洋输送到阿尔卑斯山。与此同时，极地涡旋在北大西洋上空移位、分裂，平流层突然变暖。我们讨论了阻塞在极地涡旋分裂和平流层突然变暖的可能作用及其对预测降雪事件的影响。