Hi, I have a Gen2 Rachio and it uses Weather Intelligence from PWSWeather. I also have a AcuRite Atlas PWS that ONLY uploads data to Weather Underground. I have created a sort of bridge that takes data from WU and then pushes this data to PWSWeather for hyperlocal weather info.
Figured others might find this useful if you are in the same situation as me where we are restricted to only WU for data.
It does take about a week for the PWS to be visible on the weather intelligence page, but once it is there you will be able to select your station. enjoy!