Terms in this set (66)
Air (Atmospheric/Barometric) Pressure
The pressure exerted by the Earth's atmosphere at any given point. Expressed in millibars or inches of mercury.
A large body of air that takes on the characteristics of the area over which it forms.
Layers of different gases that surround the Earth.
An instrument that measures atmospheric pressure.
A visible collection of water or ice surrounding condensation nuclei in the air.
The leading edge of a cold air mass which moves into and under a warm air mass creating a narrow band of intense precipitation.
The change in state from a gas to a liquid.
A form of heat transfer where heat energy is directly transferred between molecules through molecular collisions or direct contact.
Continental Air Mass
A dry air mass that forms over land.
Heat transfer that occurs in fluids caused by changes in density.
The flow of fluid in a certain direction.
A repeated pattern or recurring sequence of events.
An area of low pressure which rotates counterclockwise in the Northern Hemisphere.
The temperature at which air becomes saturated so that condensation can form.
The change of state of matter from a liquid to a gas.
A cloud with its base at or very near Earth's surface.
A change of state of matter from a liquid to a solid.
The boundary between air masses that differ in temperature.
A frozen form of precipitation, that consists of ice pellets that keep getting blown back up into the cloud until it gets too heavy and falls to earth.
An intense low pressure weather system with winds of 74 mph of greater.
Incoming solar radiation, mostly sunlight.
A line on a weather map that connects points of equal barometric pressure.
A narrow belt of strong winds that blow in the upper troposphere.
Maritime air mass
A humid air mass that forms over oceans.
A change of state of matter from solid to liquid.
A branch of science dealing with the atmosphere and its phenomena, including weather and climate.
A composite front when colder air surrounds a mass of warm air and forces it aloft
Planetary wind system
The belts of prevailing winds found between Earth's pressure zones.
Polar Air Mass
A cold air mass that forms in a high-latitude source region.
Polar jet stream
A river of air that forms at the boundary of cold dry polar air to the north and warmer moist air to the south.
Any of a number of falling products of condensation in the atmosphere, as rain, sleet, snow, or hail.
The amount of pressure change occurring over a given distance.
An instrument used to measure relative humidity, and dew point temperature consisting of wet-bulb and a dry-bulb thermometers.
Energy that is radiated or transmitted in the form of rays or waves or particles. Doesn't need a medium to travel.
A percentage of the amount of water vapor in the air at a given temperature compared to the maximum amount it could hold at that temperature.
Meaning to be full.
Clear ice precipitation formed when raindrops freeze before they reach the ground.
Smoke or other atmospheric pollutants combined with fog in an unhealthy or irritating mixture.
Form of precipitation that forms when temperatures are cold enough that water vapor turns directly into a solid.
The amount of energy (joules) required to raise the temperature of 1 gram of a substance by 1 degree Celsius.
A pattern of meteorological symbols that represents the weather at a particular observing station and that is recorded on a weather map.
A front that occurs when cold and warm air masses meet but neither advances.
A measure of the average kinetic energy of a substance.
An instrument used to measure temperature.
A localized, violently destructive funnel of wind occurring over land.
Tropical Air Mass
Air warm mass that forms over the tropics.
The movement of a less dense, warmer air mass over a more dense, colder air mass.
Condition of the atmosphere at a specific time and place.
Weather (atmospheric) variables
changable atmosphere conditions such as temperature, air pressure, wind, moisture, cloud cover, precipitation, and storms.
The movement of air caused by differences in air pressure.
Applies to both liquids and gasses.
Any wind that changes directions with the seasons.
Instrument used to measure wind direction.
An instrument used to measure wind speed.
Microscopic particles on which water vapor condenses to form cloud droplets.
When air masses are pushed up by mountains or other tall features and causes the air to cool as it rises.
Synoptic Weather Map
A map showing the meteorological elements at a given time over an extended area.
The path frequently traveled by a cyclonic storm as it moves in a generally Northeastward direction from its point of origin in the mid-latitudes.
Visible light from the Sun enters the atmosphere, is absorbed by the surface and radiated as infrared which cannot escape the atmosphere, causing temperatures to rise.
The temperature at which all molecular motion stops. 0 K
Denser sinking air producing "happy" weather. Surface winds are out & clockwise.
Less dense rising air producing "lousy" weather. Surface winds are in & counterclockwise.
Low pressure systems that develop where air masses from north and south meet in mid-latitude. Can bring severe weather across the entire US.
Surface wind that develops over bodies of water and blows towards land due to differences in air pressure created by their different heat capacity (specific heat). Night time.
Surface wind that develops over bodies of land and blows towards the sea due to differences in air pressure created by their different heat capacity (specific heat). Day time.
Describes the average weather conditions over long periods in a given area.