"Clearly, the system worked as designed," said Jeff Spaulding, Nasa's senior test director.
More storms were expected. Although forecasters gave 80 per cent odds of acceptable weather Monday morning, conditions were expected to deteriorate during the two-hour launch window.
On the technical side, Spaulding said the team did its best over the past several months to eliminate any lingering fuel leaks. A pair of countdown tests earlier this year prompted repairs to leaking valves and other faulty equipment; engineers won't know if all the fixes are good until just a few hours before the planned liftoff. If Monday doesn't pan out, the next launch attempt would be Friday.
After so many years of delays and setbacks, the launch team was thrilled to finally be so close to the inaugural flight of the Artemis moon-exploration programme, named after Apollo's twin sister in Greek mythology.
"We're within 24 hours of launch right now, which is pretty amazing for where we've been on this journey," Spaulding told reporters.
The follow-on Artemis flight, as early as 2024, would see four astronauts flying around the Moon. A landing could follow in 2025. Nasa is targeting the Moon's unexplored south pole, where permanently shadowed craters are believed to hold ice that could be used by future crews.