Bermuda high - A semi-permanent subtropical high over the North Atlantic. Can contribute to excessive heat and humidity in the southern and eastern US. The placement of this high is also the main steering force for hurricanes that develop in the Atlantic.

Isotherm - A line on a weather map joining locations of equal temperature. When looking at weather maps displaying temperatures across the lower 48, isotherms are used to divide the country in different colors based on the varied temperatures. Oftentimes, each isotherm will indicate a change of 5 or 10 degrees.

Doldrums - An east-west belt of light and variable surface winds where the trade winds of the two hemispheres converge. This region is located in a belt just north and south of the equator. Sailers dubbed this area as the doldrums because the lack of wind would mean their ships would stay idle for weeks at a time.

Scud clouds - Low, detached clouds caught in the outflow beneath the thunderstorm. Scud clouds are often mistaken for funnel clouds or tornadoes as they do occur in the vicinity of a wall cloud. The easiest way to discern a scud cloud from a funnel cloud is to discern whether the cloud formation is rotating. Scud clouds also tend to be broken up in pieces underneath the wall cloud.

Altostratus Clouds - Are gray or blue-gray middle level clouds composed of ice crystals and water droplets. These clouds usually cover the entire sky. In the thinner areas of the cloud, the sun may be dimly visible as a round disk.

Mesoscale - Mesoscale is the study of meteorology concerned with small scale weather systems that are from 6 to 60 miles in diameter. The discipline of mesoscale meteorology is focused on phenomenon such as thunderstorms, land or sea breezes, and downslope wind storms.

Supercell Thunderstorm - A relatively long-lived, large and intense storm cell characterized by exceptionally strong updrafts that can exceed 100 mph. Supercell thunderstorms have updrafts that rotate, which gives them the ability to remain intact for long periods of time. Most of the strong to violent tornadoes that develop are associated with supercells.