Rainbow - An arc of concentric colored bands formed by refraction that occurs when sunlight passes through raindrops. Anytime you see it raining while the sun is out, there will almost always be a rainbow. Just position yourself with your back to where the sun is shining and you will find it.

Updraft - A stream of air that accelerates upward from the surface. The strongest updrafts are found within thunderstorms. Strong thunderstorms can see updraft speeds of over 100 mph!

Stratopause - The boundary or transition layer between the stratosphere and mesosphere. The stratopause is located around 30 miles above the surface of the earth.

Anabatic - refers to a rising wind flow, oftentimes climbing up a hill or mountainside. Anabatic winds are driven by localized heating at the surface, which creates a rising current of air due to the lower density that warmer air has.

Ionosphere - A complex atmospheric zone of ionized gases that extends between 40 and 600 miles above the earth's surface. It is located between the mesosphere and the exosphere and is included as part of the thermosphere. The ionosphere greatly impacts the propagation of radio waves.

Squall - A sudden increase in wind speed, usually associated with lines of convective thunderstorms. A squall can also be used when describing quick-hitting, heavy lake-effect snow bands.

Entrainment - The mixing of environmental air into a preexisting organized air current or cloud so that the environmental air becomes part of the air current or cloud. Cumulus clouds are subjected to the process of dry air entrainment on their outside edges. This is why cumulus clouds take on a lumpy and jagged form.