Storm Kin are the Riders of the Crystal Desert.
About 8–10 are located near the Salt Flats portal. Head west Augury Rock into Prophet's Path, turning north as soon as possible. Head east into the basin (slightly easier than using the teleporter) then northwest towards the exit. Zone and repeat.
Exit from Seeker's Passage. Go east and north to find Storm Kin patrols. The last group is just south of Sennat Sen. Then, go south of the outpost. Take the teleporter to an old abandoned town/port filled with Storm Kin.
Exit Augury Rock to Skyward Reach; head north (avoiding any Hydra) and then bear west. Hug the NE corner (killing the Kin). Approximately 6–8 foes (can be taken one at-a-time).