SpaceX is launching the earth observation satellite SAOCOM 1A from Vandenberg on a Falcon 9 rocket.
Launch window opens at 02:21 GMT(October 8th 2018).
You can watch the live stream here. Approximately 15 minutes before lift off.
Background information about previous launches at Wikipedia
The first stage of the Falcon 9 will land on a ground pad on the west coast for the first time.
Mr. Steven will try to catch a fairing for the first time. This time he has a 4 times bigger net than before.
Also: warning of sonic booms for people who are in the area of Santa Barbara, Ventura and San Luis Obispo counties.