The Parker UHI paper (see [[Urban Heat Island]]) from Nature 2004 (and the Peterson 2003) strengthens the TAR contention that the UHI isn't important; and perhaps negligible. Now RP Sr has taken a shot at it. Unfortunately his paper is... difficult. You can take his word for what it says if you like, but I'd rather not. Happily, RP is so confident of his position that he has followed up with a whinge about Nature rejecting him, which includes the reviewers responses: Pielke has failed to adequately assess whether there are any trends in windiness in the Parker data set. Parker stratified by wind conditions, both at rural and urban sites, so any trends in windiness (even if this were possible in a stratified data set) would occur both at rural and urban sites. To suggest that there would be different turbulent mixing at rural and urban sites would then require differences in trends in temperature to be found, which is exactly what Parker found not to be the case. The logic presented in Pielke’s comment is circular and incorrect is the briefest.
One day I may actually read it, or meet someone who has. Until then I don't have a good way to assess it.