Berlin (TXL and SXF) closed until Friday April 16, 12:00 p.m. at least. As are most German airports in the north of Germany.
My flight out this morning got cancelled as well, will have to stay here this weekend.
Communication form the airports in Berlin is really ridiculous. Their web page went donw from early last night. Now it only says airports closed and to call your airline, how bad is that?