Weather question.....

Probably something simple, but I need help. I get to the last two destinations and the ATIS comes at me with -400 and -1200 foot cloud readings. I am using the real time weather in FS9 and I noticed they have eliminated the "clear all previous weather" settings button. I assumed on previous versions it cleared the cache and after reading past posts, that seems to be the problem here. So, how does one clean the weather cache in FS9?:-bigangel