A quick follow-up question if you're still fielding them here, Deke. A 2012 article talks about how climate divisions in Alaska were updated recently through a cluster analysis (dividing Alaska into 13 climate divisions): https://journals.ametsoc.org/doi/pdf/10.1175/JAMC-D-11-0168.1 Are those climate divisions (along with the other climate divisions in the lower 48 states) taken into account by the PHA somehow (or the GHCN), like as a starting point assumption? Or, does the PHA establish its own version of such divisions, independently, when it performs its homogeneity comparisons? Thank you, Chris