Yeah, clouds will play a factor. Also the moon will be at 50%. The good news though is this is expected to produce around 200 meteors per hour. We're hitting one of the main streams from the comets' debris path, which we haven't hit before. This could be an exceptional show. We're currently seeing 25 an hour which isn't bad for the Persieds. Also the most exciting ones to see are going to happen between 9-11pm Tuesday night, earth-grazers.