We're migrating all Storage data to a new location today.
The migration is scheduled for 23:00 CEST (21:00 GMT), and will take at least 6 hours. Individual storage accounts will not be able to write or delete data during their migrations, each taking anywhere from a few seconds to a few minutes. Retrieving data will work without interruption however. With most remoteStorage-enabled apps, the impact will be minimal, as your apps will just cache the write/delete operations and sync them automatically later on. Any direct writes or deletes however will return a 503 status code during those minutes.