Just some brain fart. Many false rain alerts come from birds landing on top of the unit. Many of those could be prevented by checking the brightness sensor for a sudden drop of say 20%. Now that might also be a cloud, but if you make at a user selectable option to enable this suppression, some people would be happy (an option because some people depend on having the very first drop reported). I would be happy.
For the tempest owners there might be an even better way:
When there would be some other brightness sensor it could compare the two. Sudden drop in brightness for the top one but not for the other one, means it is most likely a bird. The unit doesn’t have a second sensor, but the tempest does have a solar panel. Perhaps that could be used as the second brightness sensor. @dsj