I would like to see the Tempest with built in cameras. I currently receive sky forecasts for sunny skys when it is totally overcast. Cameras may help increase the accuracy of a forecast. I don’t think they would have to be high res or transmit images often tone effective for the intended purpose. This could be a model option.
Forecasting the amount of clouds like 0%, 25%, 50%, 75%, 100% of the sky covered with clouds is probably pretty hard to do accurate. I don’t think that it would be wrong like yours very often.
I have currently two cheap Chinese camera’s with special “starlight” option, so it can see the clouds even at night. I’m pretty happy with them. You might consider that route, but of course that data won’t feed into the tempest forecast.