Whirlwind / Elemental Question

[DBlue]

Did a search, but didn't see anything.

When an air elemental transforms into a whirlwind, is there any limit on how often they can do it/how long they can stay in that form?

Generic whirlwind ability description says "for up to 1 round for every 2 HD they have." It also says the the format is "Format: whirlwind (3/day, 10–30 ft. high, 1d6+6 damage, DC 15); Location: Special Attacks."

Air elementals do not have the per day listed.

So, the way I'm reading it is that a small air elemental(2 HD), can use a standard action to transform into a whirlwind for 1 round, use a move action to cause trouble, and then revert to normal form at the start of the elemental's next turn, but the elemental can do that as often as it wants.

[Tom Baumbach]

You are correct. Other creatures with the ablity — djinn are the only ones I'm aware of — have a limit on how often they can use it. In any case, Hit Dice determines how long the creature remains in whirlwind form.