Published: 2007-05-22 11:23:24
Updated: 2007-05-22 11:23:24
Posted May 22, 2007 11:23 a.m. EDT
MIKE MOSS SAYS: Sara, Partly cloudy means that on average for the period covered by the forecast, or at a given moment when an observation is taken, about three to five eights, or oktas, of the sky is covered by opaque clouds. That translates to a range of roughly 35-60%.