Is it possible to re code storm paths? As is right now you either never get hit by a tornado or you get hit by every single storm (storm target player true/false). Is it possible if it doesn't target player that the tornadoes could hit the player or it could not hit the player? It kind of just goes where it wants like picks a direction and angle and goes that way? Also a problem is that sometimes weather deflectors do not work. On my fan server spawn has been destroyed multiple times due to weather deflectors failing. It isn't much of an issue as I have just built it out of non pick upable blocks but I think it may be due to chunk loading. I understand you're extremely busy but if you find time you might want to look into these things.

Interesting, chunkloading might be a cause, thats worth investigating, as for tornado direction, they aim at player with a random bit of variance, reduce value for Storm_Tornado_aimAtPlayerAngleVariance to make them more accurate

When the old weather mod and weather2 both work at the same time.

Note: It only works on 1.6.4 at the moment, not sure if it'll work on 1.7.10