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29 terms

weather

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Cold Front
When a rapidly moving cold air mass overtakes a slow-moving warm air mass.
Stationary Front
When a warm air mass and a cold air mass meet and neither can move the other.
Tornado
A funnel shaped cloud that touches Earth's surface.
Meteorologist
A scientist who studies weather and tries to predict it.
Isobars
Lines on a map joining places that have the same air pressure.
Warm Front
When a warm air mass overtakes a cold air mass.
Isotherms
Lines on a map joining places with the same temperature.
Storm
A violent disturbance in the atmosphere.
Front
The boundary where unlike air masses meet but do not easily mix.
Occluded Front
Where a warm air mass is caught between two cooler air masses.
Flash Floods
Sudden, violent floods that occur shortly after a storm.
Hurricane
A long-lasting storm that starts over the warm surface of the ocean and has winds of 119 km or higher.
cyclone
(meteorology) rapid inward circulation of air masses about a low-pressure center
anticyclone
n. An atmospheric condition of high central pressure, with currents flowing outward.
lightning
the flash of light that accompanies an electric discharge in the atmosphere (or something resembling such a flash) from opposite charges
Thunder
a booming or crashing noise caused by air expanding along the path of a bolt of lightning
thermometer
measuring instrument for measuring temperature
barometer
an instrument that measures atmospheric pressure
anemometer
a gauge for recording the speed and direction of wind
weather
Short term fluctuations (days, weeks) in temperature, precipitation, and humidity resulting from rapidly forming and decaying weather systems.
humidity
The amount of water vapor in the air
relative humidity
ratio of the amount of water vapor in the air to the actual amount of water vapor needed to reach saturation at a given temperature
condensation
Change in state from a gas to a liquid
cumulus cloud
puffy , white clouds that tend to have flat bottoms, usually indicate fair weather
stratus clouds
Clouds that form in layers. Stratus clouds cover large areas and usually block out the sun.
cirrus clouds
thin, feathery white clouds which format high altitudes
percipitation
water that falls from the atmosphere to the Earth as rain,sleet , or snow
air mass
a large body of air where temperature and moisture content are constant throughout
anitcyclone
rotation of air around a high pressure center in the opposite direction of Earth's rotation