So, I foolishly believed the TBT when it said Dan wasn't on today.
Turns out, he was.
There's not much to report in the way of Dan-isms. I missed him on BBCi and also on BBC One (where, if you believe what you read, he warned us that we'll be in for 'whooosh' tonight).
Also, there's no sign of Dan in this week's Radio Times.
UPDATE OCTOBER 2013:
There's video of an unknown forecast from this date and video of Dan doing the 19:30 forecast on BBC News embedded below.
19:30 BBC News
Thanks to MikeAffordMedia for the video.
Thanks to bismuthcadmium for the video.