In hope that this could be useful to you: In Europe I had good success using AccuWeather for a similar purpose, the 60min forecast was almost always on point.
It's always worth a try. My father on the east coast reported similar excellent accuracy for hyperlocal precipitation forecasts from AccuWeather, but I've found the rain forecasts in TX little better than guesses (often going so far as to fail to predict what the rainfall will be in 15 minutes, much less in a few hours).