The mixture of gases, which form the atmosphere of the Earth.

– Chemicals or substances in the atmosphere that are directly or indirectly harmful to living things.

The weight of air pressing down on earth. Air pressure can change from place to place, and this causes air to move, flowing from areas of high pressure toward areas of low pressure. It&#14 [..]

A fast-moving low pressure system that occurs during the winter and sweeps southeast from Alberta, Canada, across the northern Great Plains and Midwest of the United States. These storms usual [..]

An air mass that originates over Canada and brings us cold temperatures.

It’s often called the "northern lights". It occurs 50 to 100 miles above the earth, when energetic particles from a solar storm cause the gases in the upper atmosphere to gl [..]

A system of estimating and reporting wind speeds. It is based on the Beaufort Force or Number, which is composed of the wind speed, a descriptive term, and the visible effects upon land object [..]

It’s a weather system that often dominates the eastern United States during the summer. A semi-permanent subtropical high-pressure system over the North Atlantic Ocean brings in warm [..]

When wind driven snow reduces the surface visibility causing dangerous driving conditions. Blowing snow can be falling or snow that has already accumulated on the ground but is picked up and b [..]

Thin, wispy clouds that form high in the atmosphere as their water vapor freezes into ice crystals. Cirrus clouds are a principle cloud type.