1. Sign up now and join over 35,000 northwest gun owners. It's quick, easy, and 100% free!
  2. We're giving away over $850 in prizes this month -- enter now for your chance to win!
    Dismiss Notice


A thermal column (or thermal) is a column of rising air in the lower altitudes of Earth's atmosphere, a form of atmospheric updraft. Thermals are created by the uneven heating of Earth's surface from solar radiation, and are an example of convection, specifically atmospheric convection. The Sun warms the ground, which in turn warms the air directly above it.

View More On Wikipedia.org