Tempest Domain.

Gods whose portfolios include the Tempest domain govern storms, sea, and sky. They include gods of lightning and thunder, gods of earthquakes, some fire gods, and certain gods of violence, physical strength, and courage. In some pantheons, a god of this domain rules over other deities and is known for swift justice delivered by thunderbolts. In the pantheons of seafaring people, gods of this domain are ocean deities and the patrons of sailors. Tempest gods send their clerics to inspire fear in the common folk, either to keep those folk on the path of righteousness or to encourage them to offer sacrifices of propitiation to ward off divine wrath.

Level 1 Features:

Tempest Domain Spells.

Each domain has a list of spells—its domain spells—that you gain at the cleric levels noted in the domain description. Once you gain a domain spell, you always have it prepared, and it doesn't count against the number of spells you can prepare each day.
If you have a domain spell that doesn't appear on the cleric spell list, the spell is nonetheless a cleric spell for you.

Bonus Proficiencies.

At 1st level, you gain proficiency with martial weapons and heavy armor.

Wrath of the Storm.

Also at 1st level, you can thunderously rebuke attackers. When a creature within 5 feet of you that you can see hits you with an attack, you can use your reaction to cause the creature to make a Dexterity saving throw. The creature takes 2d8 lightning or thunder damage (your choice) on a failed saving throw, and half as much damage on a successful one.
You can use this feature a number of times equal to your Intelligence, Wisdom or Charisma modifier (a minimum of once). You regain all expended uses when you finish a long rest.

Level 2 Feature:

Channel Divinity: Destructive Wrath.

Starting at 2nd level, you can use your Channel Divinity to wield the power of the storm with unchecked ferocity.
When you roll lightning or thunder damage, you can use your Channel Divinity to deal maximum damage, instead of rolling.

Level 6 Feature:

Thunderbolt Strike

At 6th level, when you deal lightning damage to a Large or smaller creature, you can also push it up to 10 feet away from you.

Level 8 Feature:

Divine Strike.

At 8th level, you gain the ability to infuse your weapon strikes with divine energy. Once on each of your turns when you hit a creature with a weapon attack, you can cause the attack to deal an extra 1d8 thunder damage to the target.

Level 17 Feature:

Stormborn.

At 17th level, you have a flying speed equal to your current walking speed whenever you are not underground or indoors.