discontinuous weather

Hi there,a newbie question: despite having entered a flight plan, the weather en route has some discontinuity (for example cloud cover changes from one second to the other)....i though AS2012 was all about not having those weather jumps.I mostly fly short routes i.e 100 to 400 NM.What am I doing wrong ?BestKarim

Edited January 31, 201214 yr by fulcrum_64th