The mercury is rising, tempers are flaring and Metro passengers are sweltering in hot Metrorail cars.

For weeks, the Twitterverse has been alight with photos and reports of hot cars. Several Twitter accounts have popped up to document this phenomenon (and hopefully, get the attention of WMATA officials who are the ones in a position to fix the problem) — @MetroHotCars is one that we’re following.

Earlier this summer, a fake dating site inspired by Metro’s hot cars popped up. Metro officials were not pleased.

Lori Aratani writes about how people live, work and play in the D.C. region for The Post’s Transportation and Development team.