Tiny Question on Storms -- and thanks

[onomastikon]

First of all, thanks a lot for all the replies and help I have received from the people on this site, the majority of which have been very friendly and tolerating to my newcomerness and the questions I have been posing.

Some kind soul suggested to try Man as a beginner because of the (relatively) easy way to learn magic, so I am, and with some success -- thanks! I am concentrating on Nature and Air (of course) and going alteration and then conjuration, and maybe I will try construction too.

There is this one spell Thunder Strike I think it is called -- can only cast during a storm. And someone wrote on some post I can no longer find that there is an item you can make which always summons a storm on the battlefield -- does anyone know which item that is and what is needed to make it? Cant find that....

(Subquestion: would it also perhaps be a bad idea to do this with Man, however, because of the archers who will have a tough time in storms?)

thanks