LIVE: NASA briefing on Artemis II mission

Propellant loading begins early morning

Cryogenic fueling of the SLS rocket starts at 7:34 a.m. ET tomorrow, requiring approximately 5.5 hours to complete before the 6:24 p.m. window opening.

Crew timeline and pad operations

The Artemis II crew will wake at 9:45 a.m., arrive at the pad before 2:00 p.m. for strapping into Orion, and undergo final leak checks before the closeout crew departs the white room at 5:30 p.m.

Terminal count procedures

Following a 3:00 a.m. pad clearance and 4:00 a.m. air-to-GN2 purge for safety, the launch team will conduct final polls before initiating the last 10-minute terminal count.

Vehicle systems powered and tested

Engineers completed power-up of the Orion core stage and ICPS upper stage, along with RF communication checkouts, while late stow operations continue to install crew equipment.

Launch pad reconfiguration underway

Teams are performing final walkdowns, closeouts, and ground system configurations, including preparations for crew suit leak check equipment activation tonight.

Primary window shows 80% go probability

Isolated cumulus clouds and 15-20 knot easterly winds represent the primary concerns for tomorrow's launch, with lightning risk remaining low at 5-10%.

Solar activity monitored but not threatening

A recent solar flare directed energy away from Earth with minimal impact expected, though forecasters continue monitoring sunspot rotation toward the center of the solar disc.

Backup windows show declining conditions

Thursday offers 60% favorable conditions while Friday improves to 75%, though models indicate increasingly moist, unfavorable weather patterns developing by the weekend.