Storm Chaser (3.5e Flaw)
From D&D Wiki
You long for the flash of thunder and the wail of wind. Calm days make you painfully uncomfortable.
Effect: You suffer 5d4 damage every day if the weather is normal. This damage can not reduce your HP to or below 0. Take 1d4 damage per hour a maximum of 5 times a day if the weather holds clear. If any inclement or stormy weather occurs, you do not have to take any of damage for the remainder of the day. Damage already received is not recovered during weather events.
Roleplaying Ideas: You grew up in a stormy world. Erratic air pressure keeps your blood pressure stable.