Meteorology and atmospheric science

Weather, atmospheric structure, storms, and the physics of forecasting

What is meteorology?

Meteorology is the study of the atmosphere and the weather it produces — the short-term, day-to-day changes in temperature, wind, clouds, and precipitation that we experience constantly.

What drives weather

Weather is ultimately driven by uneven heating from the Sun: different parts of Earth's surface, and different layers of the atmosphere, absorb and release heat at different rates, creating differences in temperature and pressure. Air naturally moves from areas of higher pressure to areas of lower pressure, and this moving air — wind — carries heat and moisture around the planet, producing the weather patterns we observe.

Clouds and precipitation

Clouds form when water vapor in the air cools enough to condense into tiny visible droplets or ice crystals, usually as air rises and expands (rising air cools, a principle explored further in the advanced article). When these droplets or crystals grow large and heavy enough, they fall as precipitation — rain, snow, sleet, or hail, depending on the temperatures the falling particles pass through.

Fronts and storms

A front is the boundary between two air masses with different temperatures or moisture levels, and weather often changes noticeably as a front passes through an area. Storms, from ordinary thunderstorms to large-scale hurricanes, develop when warm, moist air rises rapidly, releasing energy as its water vapor condenses — the same basic process behind ordinary cloud formation, just on a much larger and more energetic scale.

Why meteorology matters

Meteorology makes modern weather forecasting possible, protecting lives and property by warning of severe storms, hurricanes, and other hazardous weather well in advance, and it supports agriculture, aviation, shipping, and countless other activities that depend on knowing what the atmosphere is likely to do next.