Updated May 6 New cat named Nimbus settles in at Mount Washington Observatory The observatory staff have had a cat at the 6,288-foot summit, called the 'home of the world’s worst weather,' since 1932. Associated Press NORTH CONWAY, N.H. — There’s a new feline prowling about the highest peak in the Northeast. Nimbus, a gray shorthair who shares his name with large, gray clouds that bring precipitation, has been a resident at the Mount Washington Observatory since April 14. The observatory staff have had a cat at the 6,288-foot summit, called the “home of the world’s worst weather,” since 1932.