Speaking with the Wind's Voice

Objectives
Bring 5 Voices of the Wind to Moteha Windborn at the Grom'arsh Crash-Site.
 * Voice of the Wind (5)

Description
I suppose we shouldn't have expected to find Brann so easily, not with our luck. If we can make sense of what Brann is saying, you can persuade him to give up his location.

The power of the wind is strong in these mountains, and it may prove a great boon to us. A knowledgeable shaman can hear the sound of all the world's tongues on the wind.

To the northwest, on the Snowdrift Plains, you will find beings made of wind, the stormriders. Capture their voices and bring them to me.

Rewards
You will receive:

Progress
Have you brought the wind's voices?

Completion
You should be able to communicate with the dwarf now. Ask Boktar what he requires of you. There is little time to lose.