I think it probably has more to do with path loss than the multi-path effects that the rain drops would have. That is the reflection from water in the cloud onl

I think it probably has more to do with path loss than the multi-path effects that the rain drops would have. That is the reflection from water in the cloud only has to travel through a smaller amount of rain than it might if you were doing it over a terrestrial network, but I definitely don't know all the ins and outs of CW transmission.