First snow of the winter?

[TomK]

Royall - I wouldn't worry about it. I don't know which observatory you mean but the readings can be out by a few percent either way and just means they're not calibrated perfectly. It also might mean that the humidity is being calculated in software and no-one thought to put a limit of 100% in there somewhere. If you see a reading above 100% it probably means fog and the calibration is a little off.

Tom
http://apacificview.blogspot.com/