We have it from the mothers and fathers that Thunder is a powerful Protector.
To call on His might, stand tall. With your strong hand, reach up into over-heaven. Seize the lightning, and grasp it in your hand. With arm extended, pull it down to heart-height. See the flash, hear the roar, smell the superheated air.
Having brought down lightning, you must give it a ground. With arm still extended, move your clutched fist horizontally beneath the down-stroke to form the shape of an inverted T. For obvious reasons, this is mostly done from left to right.
As you do this, intone: