That is very helpful. Perhaps this information should be added to the FAQs about PWS.
What confused me was this article:
What Weather Station Are You Using For My Property?
In particular: “When this option is toggled on we are going to be gathering data from both the nearest national weather station, and the nearest personal weather stations.”
This is the only mention I’ve seen of drawing data from more than one source. It still doesn’t say where forecasts come from. If you visit the websites for the stations (following the procedure given in the article), they show only current and historical data, not forecasts.