Read the notes, then try the practice. It adapts as you go.When you're ready.
Session Length
~17 min
Adaptive Checks
15 questions
Transfer Probes
8
Meteorology is the scientific study of the atmosphere, focusing on weather processes and forecasting. It examines how temperature, pressure, humidity, and wind interact to create the weather patterns that shape daily life and long-term climate. Rooted in physics, chemistry, and fluid dynamics, meteorology applies fundamental scientific principles to one of the most complex systems on Earth, the atmosphere, which is a chaotic, nonlinear fluid envelope surrounding the planet.
The field has evolved dramatically from ancient observational traditions to a modern, data-intensive science. Early meteorologists relied on barometers, thermometers, and empirical rules to make short-range forecasts. Today, numerical weather prediction uses supercomputers to solve the governing equations of atmospheric motion across global grids, assimilating millions of observations from satellites, radiosondes, radar, and surface stations every six hours. This computational revolution, pioneered by Vilhelm Bjerknes and later realized by Jule Charney and John von Neumann, has extended useful forecast skill from roughly one day in the 1950s to over a week in the modern era.
Meteorology has profound societal importance, spanning aviation safety, agriculture, disaster preparedness, renewable energy, and climate change science. Severe weather events such as hurricanes, tornadoes, floods, and heat waves cause billions of dollars in damage and thousands of fatalities each year. Accurate forecasting and effective warning systems save lives, and advances in mesoscale modeling, ensemble prediction, and satellite remote sensing continue to push the boundaries of what meteorologists can anticipate and communicate to the public.
One step at a time.
The force per unit area exerted by the weight of the atmosphere above a given point. Variations in pressure drive wind and are the primary organizing force behind weather systems such as cyclones and anticyclones.
Example: A falling barometer reading indicates decreasing atmospheric pressure, which typically signals the approach of a storm system with clouds and precipitation.
Boundaries between air masses of different temperature and humidity characteristics. Cold fronts, warm fronts, stationary fronts, and occluded fronts each produce distinct weather patterns as air masses interact.
Example: A cold front passing through a region often brings a narrow band of heavy rain or thunderstorms, followed by a sharp drop in temperature and clearing skies.
An apparent deflection of moving objects (including air parcels) caused by Earth's rotation. It deflects winds to the right in the Northern Hemisphere and to the left in the Southern Hemisphere, shaping large-scale circulation patterns.
Example: The Coriolis effect causes hurricanes to rotate counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere.
The vertical transport of heat and moisture in the atmosphere driven by buoyancy differences. When the surface heats unevenly, warm air rises and cool air sinks, forming convective cells that can develop into cumulus clouds and thunderstorms.
Example: On a hot summer afternoon, convection over sun-heated land surfaces can trigger isolated thunderstorms, especially near mountains or along sea-breeze boundaries.
The use of mathematical models of the atmosphere and oceans to predict weather based on current conditions. NWP solves the primitive equations of fluid motion on a discrete grid using supercomputers.
Example: The European Centre for Medium-Range Weather Forecasts (ECMWF) runs a global NWP model with roughly 9 km grid spacing that produces forecasts up to 15 days ahead.
Changes in temperature of an air parcel that occur without the exchange of heat with the surrounding environment. Rising air expands and cools adiabatically; sinking air compresses and warms. The dry adiabatic lapse rate is approximately 9.8 degrees Celsius per kilometer.
Example: Air forced to rise over a mountain range cools adiabatically, causing water vapor to condense and produce precipitation on the windward side, while descending air on the leeward side warms and dries, creating a rain shadow.
Narrow bands of strong winds in the upper troposphere, typically flowing from west to east at speeds of 100 to 400 km/h. They form along sharp temperature gradients and steer mid-latitude weather systems.
Example: The polar jet stream's undulations determine whether a region experiences warm or cold spells; a deep trough brings polar air southward, while a ridge pushes warm air northward.
Humidity measures the amount of water vapor in the air. The dew point is the temperature at which air becomes saturated and condensation begins. Relative humidity expresses the current moisture content as a percentage of the maximum the air can hold at that temperature.
Example: A dew point of 20 degrees Celsius indicates substantial atmospheric moisture and suggests muggy conditions, while a dew point below 10 degrees Celsius feels comfortable.
More terms are available in the glossary.
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