I'm the developer of Flowx[0], an Android and iOS weather app, and I've just added the solar eclipse path and shadow which can be superimposed over the weather forecast - in particular the low, mid and high cloud forecasts.
I've also created an OpenZone which make all weather data (including HRRR) freely available over North America for the period leading up to the eclipse day.
This is available in the latest Apple App Store release. Unfortunately, I could not get this out to production Android in time but have an alpha test version. Contact me if you are interested in the alpha test version.
Cheers, Duane.
[0] https://flowx.io