Taranis is the Gaulish thunderer, named by the Roman poets beside Esus and Teutates, and shown with a thunderbolt and a wheel. The wheel is the year turning and the bolt is what clears the way for it: the storm as a mechanism of time.
Modern Practice
Taranis is invoked in stormy weather and at the turning of the year. His practice is to stand in the open and let the noise do its work, then to repair what it broke.