How Much Does the Cloud Weigh?

The cloud scientist is a meticulous fellow. He spends his days measuring and observing every attribute of the clouds. He even goes as far as ringing the clouds out to weigh the amount of water in them. One day a peculiar bunny shaped cloud floats across the sky above the scientist. While he tries to get a proper look, the cloud does a good job eluding his efforts. It's not until there is a thunderous rainstorm, that scientist can even get close to observing the bunny cloud again, but time it is much more risky because of threat of lightening.