The storm card is a card that is found in episode 16 after Kero and Sakura had the fight. I don't have too much info on it but it doesn't seem to be too important to the plot since the float card plays a more important role. The storm card attacked Sakura and Li but they managed to best it. This card went to Li Showron

Storm's Power is to create fair sized tornados probably for attack purposes. It's probably a sub card under Wind element.