Jim, thx this is really critical to develop this resource as storms both small and large are contributing (as well as ordinary weather). It is shocking to see the usual 2 mm shoot up to 12, that's no desert.
Did you try Tropical Tidbits? Someone posted a very nice TPW image from them the other day on 2016/17 freezing season. Climate Reanalysis might also have a time series. Also, we could use TCW total cloud water which is complementary to water vapor. Nullschool is so-so, bad palette and not conducive to say weekly or monthly averaging.
If you are on twitter, maybe ask Zach at @ZLabe if he is interested in providing it. We will be needing current daily, last month animation, and inter-year comparisons especially for fall and winter. (Summer presents different radiation balance issues.)
Somehow this needs to get chopped down to the Arctic Ocean proper. A lot of these sources will be all over the map. The issues over land are another whole forum, snow melt or so.