The Burchardi Flood was a storm tide that struck the North Sea coast of North Frisia and Dithmarschen on the night between 11 and 12 October 1634. Overrunning dikes, it shattered the coastline and caused thousands of deaths (8,000 to 15,000 people drowned).
While all floods are not the result of global warming there is certainly no doubt that a mountain top that is 1 degree warmer will melt more snow the before.