Update 12:15 p.m.: Text from ULA's latest two mission updates: "The launch team has received the 'go' to begin filling the Centaur upper stage with the super-cold liquid hydrogen fuel following chilldown of the system. The Centaur holds about 12,300 gallons of the cryogenic propellant." "First stage liquid oxygen tank is 90 percent full thus far. The LOX will be consumed along with RP-1, a highly refined kerosene, by the RD-180 main engine on the first stage during the initial four minutes of flight. The 25,000 gallons of RP-1 were loaded into the rocket after rollout Saturday." Amazon satellite launch still targeting 1:25 p.m. Update 12:05 p.m.: ULA reported cryogenic liquid-oxygen and liquid-hydrogen fueling continue at Launch Complex 41. "We have a green board with no issues being addressed today by the ULA launch team," a ULA tweet said. NWS weather: Fair skies at Cape Canaveral Update 11:55 a.m.: As of 10:55 a.m., the most recent observation available, the National Weather Service reported fair skies, a temperature of 89 degrees, and south wind of 12 mph at Cape Canaveral Space Force Station. The heat index clocked in at 97 degrees. NASA's Kennedy Space Center issued a heat stress warning earlier this morning, advising workers to hydrate and follow their employers' heat management guidelines. ULA Atlas V Centaur tank topping to flight level Update 11:45 a.m.: ULA reported the Centaur upper-stage's liquid-oxygen tank is topping to flight level. The company's communications personnel just shared this video that describes the upcoming Project Kuiper mission profile. ULA releases rocket launch visibility graphic