Subcategory 789: magic for weather, found under Category 78: Religious Practices.

You could have gotten to this category by looking under "weather", "magic", or "spells". You could thus cross-reference your observation under any or all of these categories.

Note: If you were to start getting many entries for weather magic, you could add a number especially for that category, such as 7891.

How did you do? Practice again with a topic of your own choosing if you need to.