Yeah, that seems odd to me. I imagine they are erring on the side of caution with crazy totals, which is what made the initial 6-8" call they had all the more crazy.
The mesos look good to me. They're not spitting out high amounts, but looking at temperatures we should have some higher ratios that can boost the totals. Also, for as long as the NAM 12km and NAM 3km have it snowing the lower totals seem too low. I don't know, we'll see.