Looks like...

rain in Cleveland and Cincinnati tomorrow.

I know I'm reaching here, but I can't help but think that may slightly help Bush in OH by keeping turnout low in the state's two largest urban areas.

UPDATE: 80% chance of rain in Detroit, also.

UPDATE II: Rain starting tonight in Columbus, OH and going all day tomorrow. 60% chance of rain in Pittsburgh tomorrow, although Philly looks clear. Milwaukee is getting some rain today, but looks to be clear tomorrow as well.