Every time I find Cloud Caller, I always half expect its storm effect to have the little lightning bursts liks the Thunderstorm spell, and am vaguely disappointed when it doesn't. Fortunately, that's not too difficult to fix,

in the form of my new
Visible Cloud Caller addon.
[Looking ahead, I'm not sure how feasible it would be to add a game option to turn this effect off, and without that, I'm not sure about adding it to ZOmnibus.]