Current next launch:
MAY 5 04:05-06:05 Atlas V SLC-3E Vehicle will send the Mars InSight spacecraft and two communications relay satellites to Mars. If the launch occurs before dawn, it could be visible for more than 300 miles.
First past launch original thread message:
Supposed to be visibly impressive. You can also watch it online at space.com with broadcasting starting at 5:05
From Vadenbergs website:
Vehicle will launch Iridium Next commercial communications satellites 31-40. This launch occurs 30 minutes after Vandenberg AFB sunset. The rocket's bright flame should be visible over a wide area. The launch could be impressive beginning at T+ 2 minutes 12 seconds when simulations show the exhaust plume will be illuminated at high altitude by the sun.