The type of person who continually talks about the amount of snow your area is expected to get, often complaining or acting fearful several days before it will happen. Will refer to anything more than 2 inches as a "Snowpocalyspe" or "Snowmaggedon".
Victor: "Did you hear Amy carry on about how its supposed to snow all weekend?"
Lisa: "Yeah, she is a real Snowstradamus. Its really getting old."