It’s still officially a go at this hour for a rocket launch on the Central Coast.
An Atlas rocket is set to take off from Vandenberg Air Force Base during a launch window which opens at 11:13 p.m.
The mission includes a secret payload, which includes some small satellites.
The base launches about two payloads a year like this one from the National Reconnaissance Office.
There have been concerns that the cold weather could affect the launch plans.
While the flight details are classified, a warning issued to pilots indicates the plane will head southwest from the base.
If the weather is clear, the rocket could be visible throughout the region right after liftoff.