A polar vortex is stretching across the U.S. Feel-like temps in the tri-state are sub zero which means it may take just minutes for hypothermia or frostbite to set in.

If you've been out in the cold and you begin to experience shivering, slurred speech, drowsiness or confusion you need to get somewhere warm immediately. Once you are inside be sure to remove any wet clothing before trying to warm up.

Staying outside in the cold for a prolonged period of time can be life-threatening. Hypothermia can set in as little as 30 minutes. Doctors say if your body temperature is below 95 degrees you need to seek medical help immediately.

Signs of frostbite:

Cold skin and prickly feeling

Skin may itch, burn or feel like “pins and needles”

Skin becomes hard or cold to the touch

Skin becomes numb

Skin may change color

Blistering of skin

Signs of hypothermia:

Shivering

Mumbling or slurred speech

Shallow breathing

Weak pulse

Lack of coordination

Drowsiness or low energy

Confusion or memory loss

Loss of consciousness

Bright red, cold skin