Patch Day

From WoWWiki

Patch Day is the name of when a patch needs to be downloaded from Blizzard's servers and applied to your client to continue to play World of Warcraft. They are, unlike hotfixes, scheduled to be usually on Tuesdays (weekly maintenance downtime) in North America and on Wednesdays in Europe.

Issues

• Big patches has been known to often "break" UI mods when they make changes to the API. For this reason, many AddOn sites such as Curse and WoWInterface are known to have technical difficulties when masses of people are trying to upload their Addons. It is advised to check for updates a few days before patches are launched.

• Patch day is also a good day to avoid the forums, as there will be an even higher amount of wailing and gnashing of teeth than usual.