Weather Measurements
A measure of the amount of water vapour in the atmosphere
Humidity
The leading edge of a moving air mass; air masses with different properties do not blend easy, so this boundary develops as they meet
Front
An instrument for measuring temperature
Thermometer
A cold and dry air mass
Continental Polar
The conditions outside considered from day to day
Weather
The measure of the average energy of particles in a sample.
Temperature
Boundary which forms when a cold air mass and a warm air mass meet and stay fairly still for several days; may bring long periods of rain or snow
Stationary Front
An instrument that measures atmospheric pressure
Barometer
A warm and moist air mass
Maritime Tropical
An instrument that measures the amount of rainfall in a given period of time
Rain Gauge
The temperature at which dew forms
Dew Point
Boundary which forms when a warm air mass gradually rises over a cold air mass; rain showers are usually associated with this boundary, and hot and humid air may follow
Warm Front
An instrument that measures the amount of water vapour in the atmosphere
Hygrometer
A warm and dry air mass
Continental Tropical
Local sayings, based on observations of clouds, temperature, wind direction, and plant and animal behaviour, which help people predict the weather
Weather Lore
The measure of the amount of water vapour actually in the air as a percentage of the maximum amount of water vapour the air can hold at that temperature
Relative Humidity
A set of temperature, wind, pressure, and moisture conditions for a certain region that moves as a unit for a period of days
Weather System
An instrument that measures wind speed
Anemometer
A large body of air in which the temperature and moisture content at a specific altitude are fairly uniform
Air Mass
Weather conditions of an area averaged over many years
Climate
A measure of the force of air pushing on its surroundings.
Air Pressure
Boundary which forms when a cold air mass pushes under a warm air mass pushing it upwards; violent storms are usually associated with this boundary, and cool and fair weather may follow
Cold Front
An instrument that indicates the direction of the wind
Wind Vane
A cold and moist air mass
Maritime Polar
Pictures found on weather maps which indicate the weather conditions of a particular area
Weather Map Symbols