Vandenberg Air Force Base will be launching a Delta II rocket tonight
carrying the COSMO-SkyMed 3 earth observation satellite.
The Delta II rockets climb fairly slowly and fly towards the south, so
if the sky is clear and the launch goes well, we could have quite a show
in L.A. county.
Launch time is tonight at 7:28:21 p.m. with a launch window of 1 second
(!). So either it goes or it doesn't.
I would watch for the next ten or fifteen minutes after launch time,
looking more or less to the south west. Sunset is at about 6:07 p.m.,
so it's possible that the rocket will not be visible until it climbs out
of earth's shadow into the sunlight. Or it may show a fairly bright
exhaust plume during the ascent.
It sounds to me like a potentially good show, worth looking for.
Old Town Astronomers: http://www.otastro.org