Weather and Atmospheric Measurement Lecture

A set of vocabulary flashcards defining key meteorological terms such as atmospheric pressure systems, temperature calculations, and wind characteristics as described in the lecture notes.

Mean Daily Temperature

The average temperature of the day, calculated using the formula $\frac{\text{Maximum} + \text{Minimum}}{2}$.

Atmospheric Pressure

The pressure exerted by the weight of the air above us pressing down on the Earth's surface.

Low-pressure System (Depression)

An area where pressure falls suddenly, often bringing unstable weather including clouds, rain, and strong winds.

Cyclone

A powerful and dangerous weather event that can develop when a low-pressure system intensifies.

High-pressure System

A region where heavier air sinks, preventing clouds from forming and resulting in clear skies and calm weather.

Barometer

A device used to measure atmospheric pressure, typically providing readings in millibars ($mb$).

Millibars (mb)

The unit of measurement used by barometers to show atmospheric pressure readings.

Average Atmospheric Pressure at Sea Level

The standard pressure reading at sea level, which is approximately $1013\,mb$ or $1\text{ ATM}$.

Wind

Air in motion that moves from areas of high pressure to areas of lower pressure to balance pressure differences.

Wind Speed

A measure of how fast air is moving, usually expressed in kilometers per hour ($km/h$) or meters per second ($m/s$).

Wind Direction

The direction from which the wind is blowing (for example, a north wind comes from the north).

Humidity

A factor that describes the level of moisture in the air at a particular temperature and place.