Cellar Smells

It has been very humid and rainy here for about 2 weeks now with another week to come. My cellar has started to have a very strong musty smell. I searched for a source, but I can't find one, I think it's just the humidity. The smell is coming upstairs, and permeating everthing downstairs. Help! Does anyone have any ideas? Do dehumidifiers work? Is there anthing I can do to combat this while I wait for things to dry up weather wise? Any advice would be greatly appreciated.