A body of air extending over a large area (1,000 miles or more) that develops and retains specific characteristics of pressure, temperature, and humidity

The layer of gas surrounding a planet that is held in place by gravity

The border between an advancing cold air mass and a retreating warm air mass

A prediction or estimate of future events

Winds that act as a heat transfer system due to the unequal heating of Earth’s surface

Features on the surface of Earth, such as mountains, hills, dunes, oceans, or rivers

Directional movements of ocean water; surface currents result from steady winds over the ocean surface; deep currents result from density variations due to temperature and salinity differences

Based on probability

The boundary between an advancing warm air mass and a receding cooler air mass

The day-to-day state of the atmosphere

A map or chart that shows the weather conditions at a specific point in time over a specific region

Similar weather for a certain number of days