In the battle against the giant Porphyrion, at the Wolf House, Jason Grace uses his power to control the wind to tame Tempest to help him in the fight. When Leo Valdez needs power for his saw, Tempest allows Leo to plug it in to his body, using the storm spirit's natural electricity as his power source. Tempest manages to survive when Hera unleashes her true form after she is released from her cage by Leo Valdez and Piper McLean. However, Tempest "scatters" off and it was unknown where he went, but Hera tells Jason he will see him again.
Between the Books
Tempest was called by Jason to ride towards the Topeka 32 mile marker (and consequently finding Bacchus) during their trip to Kansas. After being possessed by an Eidolon, Jason, on Tempest, fights Percy on Blackjack. He dissipated after Jason fell off.
Tempest was called by Jason to help him fight Caligula on Incitatus. When Incitatus kicked at Tempest, the ventus used bursts of electricity that scorched the white flanks of the stallion. When Jason is struck by arrows and is impaled form the back he whispers something to his steed before toppling off. Then Tempest took Apollo and Piper onto its back and takes them away from the Julia Drusilla Yachts. But Tempest has taken them to the beach near the McLean house in Malibu. Then Piper tells Tempest to find Jason because she believes that he is still alive. Tempest finds him and takes him to the beach but he is found to be dead. Tempest is nowhere to be found after this.
Tempest has been shown to take the form of a horse made out of thunderclouds and electricity. He hasn't been shown taking a human form, and may not have a human one.
- AC Outlets - In The Lost Hero, Leo Valdez is able to plug a circular saw into Tempest and use the storm spirit as a power source for his tool.
- Tempest shares a name with one of the Gray sisters.
- He is the half-brother of the Boreads and Khione.