Tempest was a member of the Exemplars. She was transformed into Tempest by the Waterfall of Watoomb. Tempest and the other Exemplars were defeated when Bedlam to stop them.
Tempest can summon forces of nature at her command . She is able to cause giant earthquakes, manipulate winds, fly , go intangible . Her storm manipulating powers are even greater than Thor
's . It took every fiber of his being once just to keep Iron Man
and Doctor Vernon safe from Tempest's power.