Cold

A cold wave is a prolonged period of unusually cold weather when temperatures remain significantly below normal for a region and time of year.

A flash freeze occurs when temperatures rapidly fall below freezing, causing water on roads and other surfaces to freeze in a short period of time.

An Arctic outbreak occurs when a large mass of very cold Arctic air moves south into regions that normally experience milder temperatures.

A cold snap is a relatively short period of unusually cold weather when temperatures fall well below what is normal for a location and time of year.

Wind chill describes how cold the air feels on exposed skin when wind causes the body to lose heat faster than it would in calm conditions.

Extreme cold is a period of dangerously low temperatures that can increase the risk of frostbite, hypothermia and other cold-related hazards.