The full press conference at 1300 today gave more extensive explanations as to why the launch was scrubbed, but the crux of it is explained here:
An update press conference will be held this evening at 6pm EDT: https://www.nasa.gov/press-release/nasa-to-provide-update-on-artemis-i-moon-mission-status
Artemis 1's third attempt at launch will not be the charm as the scheduled launch for September 27 is a no-go thanks to the likely approach Hurricane Ian to the Florida panhandle.