The Dvorak classifications are all subjective (except for the Univ. of Wisconsin estimates, which are based off of an objective algorithm that is being tested), so changes can somewhat be based upon the judgement of the individual forecast. It's all supposed to be based off of satellite appearance, so I don't think the other factors come directly into consideration -- maybe indirectly. I don't really have a good answer one way or the other, though, beyond forecaster perrogative. If someone has a tad more information, though, I'd love to hear it.