@gusdrach, to cancel the subscription, you have to go to a platform you are originally subscribed to since Google Play and the App Store have their own administration to which we don’t have access to. The same goes for refunds.
If you are subscribed via the website (FastSpring), let me know what email address you used so I can refund you.
Here are links that will help you refund and cancel the subscription:
It is known that GFS is not very good at predicting track and wind speed of hurricanes. The model of the ECMWF is better in particular for the trajectory forecast.
NCEP use special model for hurricane forecast like HWRF. In these graphics AVNO is GFS. You see that it is far from the official (OFCL) predicted track which is quite close to ECMWF prediction.
About availability of models on Windy, the best choice is to click the "i" control just above the model selection bar: it provides Last Update Time as well as Next Update Time on Windy server side for currently selected model.