[OmikronWarrior]

Some other things to keep in mind, Storm will only halve base precision. The bonuses recieved from magic and experience do not go away. Hence, casting windguide is a way to mitigate the precision lost. However, 50% of projectiles (not magic spells) are automatically lost in storms as well. So, its problematic for an archer heavy nation to cast it.

Here's my run down of things to consider before casting storm.

1) Is your army archer heavy?
2) Do you have Air mages that would benefit from Summon Storm Power?
3) Do you expect your opponent to be archer heavy and/or cast Flaming Arrows?
4) How about flyers, anyone depending on flyers?
5) Regarding Precision, how big are your mutual armies? Big armies tend to get hit no matter what your opponents opposition is.