Another thing to consider is the difference between a global scale forecast mode (GFS, ECMWF) and a mesoscale model (HRRR, NAM, RAP). The later uses a much smaller grid size and can take into account terrain. In a place the the San Juan's (and the PNW in general), a lot of the weather patterns are coastal terrain driven so these models can be much more accurate. They catch is, they don't see out of far due to their higher computational complexity.

Here is a great resource to read up on the various models (there are far more than Windy offers): https://luckgrib.com/models/