A heat warning has been issued for Prince Edward Island, with temperatures from Tuesday through Thursday possibly reaching 30 C but feeling like 36.

"An air mass building into the Maritimes will bring an extended period of very warm conditions," Environment Canada said on its weather alerts site as the warning was posted.

"The highest temperatures are expected to occur inland, with cooler conditions near the immediate coast."

A large swath of southern Canada is under a similar warning, with the ad…