
Air Mass
A body of air extending over a large area (1,000 miles or more) that develops and retains specific characteristic's of pressure, temperature, and humidity.

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

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

Forecast
A prediction or estimate of future events.

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

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

Ocean Currents
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.

Probabilistically
Based on probability
Warm Front
The boundary between an advancing warm air mass and a receding cooler air mass.

Weather
The day-to-day state of the atmosphere.

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

Weather Pattern
Similar weather for a certain number of days.