Well....you have a few options

1. Trust the guys who fly planes
2. Trust the guys who don't fly planes
3. Take ground school

<img src="/forums/images/graemlins/lol.gif" alt="" /> <img src="/forums/images/graemlins/patriot.gif" alt="" />

It's a very complex subject and somewhat abstract if your used to "ground based" observations. The sky is a whole other ball game. <img src="/forums/images/graemlins/cheers.gif" alt="" />

98 Montero with cold weather package
96 Toyota Land Cruiser, fully locked Mall Machine :-)