Thunderstorm

Thunderstorms cause loud bursts of noise and a slim chance of lighting strike for creatures in unprotected areas. While thunderstorms do not typically impose penalties on their own, they are often accompanied by Rain.

Mild Thunderstorm: A mild thunderstorm has lightning strikes 1d6 minutes apart. Creatures have a 1% chance of being hit by a lightning bolt if out in the open, which deals 10d8 Lightning Damage (increase to 5% if wearing metal armor).
Severe Thunderstorm: A sever thunderstorm has lightning strikes every 1d6 rounds. Creatures have a 1% chance of being hit by a lightning bolt if out in the open, which deals 10d8 Lightning Damage (increase to 5% if wearing metal armor).