Delta Air Lines Inc. was quoted as saying that unfavourable weather conditions in the Northeast will affect services at its hubs in Boston and New York’s John F. Kennedy International Airport.

When you get cold, your body redirects warm blood toward your vital organs. To reduce heat loss, it narrows the small blood vessels in your hands, feet, ears and nose, making those areas prone to frostbite, a freezing injury that can damage skin and underlying tissue.

Severe U.S. snowstorm claims at least 25 lives, leaves thousands without power, and disrupts travel across the Northeast and South.

Here’s what hypothermia is, what causes it and how it is typically treated if it affects you or someone you love.

Bitterly cold temperatures are expected this weekend and local health officials are urging residents to prepare themselves.