Mark Chance
Boingy! Boingy!
Caliban said:Only if it's a narrow opening you are shooting through. Generally you just target the fireball at the center of the web, as that's the point at which total cover begins. The fireball then covers the same area as the web, burnning it all in one go.
If the center of the web has 20 feet of web between it and the caster, the center can't be targeted because it can't be seen.