2013 European floods into the Alps by the northerly flow, which led to intense orographic precipitation. Heavy rain was reported in the Austrian states of Vorarlberg and Tyrol and the area of Salzburg, and to the mountains of Upper Austria and Lower Austria and Upper Styria in a short time. On 30 May to 1 June, 150 to 200 mm of rain ( of rain) fell, in places reaching around 250 mm (), which in just a few days was the equivalent normally seen over two and a half months on average. The rainfall experienced in Austria has an expected return period of
Au, Vorarlberg Au, Vorarlberg Au is a town in the Bregenz Forest in the Austrian state of Vorarlberg, part of the district of Bregenz. The town belongs to the Bregenz Forest, more exactly to the "Hintere Bregenzerwald". Forty percent of its 45 km² area is covered with forest, 34.4% of the area is used as alpine pasture ("Almwirtschaft") and for other forms of alpine agriculture. The town itself is unlike others in the area, as it has no real centre. It consists of several districts, which are (in no particular order): Argenau, Wieden, Lugen, Lebernau, Rehmen, Schrecken, Kreuzgasse, Jaghausen, Am Stein, Argenstein,