I looked up past launches and it looks like they head south. I now remember seeing the contrails over SoCal. Too bad we live in Nor Cal now.
I see that, Cool. I wish it flew North. ;-)
found 2 old threads for launches from Vandenberg, weather delay on first attempt in June 2006
Possible amazing Light Show (Vandenberg AFB Delta IV Launch Tuesday update, 8:14PM PDT)
http://www.freerepublic.com/focus/f-news/1655570/posts
Vandenberg AFB Delta IV launch visible tonight. (8:14PM PST)
http://www.freerepublic.com/focus/f-news/1656862/posts
Only time you see them is during the twilight launches. Sun has to be in the right position to shine up on the trails.