Yeah, it defiantly needs balanced between the four attunements. I find that I pretty much only use this on earth. If they nerfed earth then it would be useless. It would be nice to see water, fire, and air brought up to the same level as earth.
If they were all moved to the earth model (10 seconds, deals damage + effect every second to targets in the area instead of the “meteor shower” pattern) then it would be much better. That would be all the changes you’d need made to water (the chill being consistent would be good enough)
The fire and air storms would need something though. The fire one could add a burn every 1-3 seconds and the air one could cause cripple and weakness.