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Science Chapter 2 Vocabulary

Science vocab from chapter 2 for the weather test.
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Weather
the state of the atmosphere at a specific time and place
Humidity
the amount of water vapor in the air
Relative Humidity
a measure of the amount of water vapor present in the air compared to the amount needed for saturation at a specific temperature
Dew Point
the temperature at which air is saturated and condensation forms
Fog
when air is cooled to its dew point near the ground, it forms a stratus cloud
Precipitation
water falling from clouds
Air Mass
a large body of air that has properties similar to the part of Earth's surface over which it develops
Front
a boundary between two air masses of different density, moisture, or temperature
Tornado
a violently rotating column of air in contact with the ground, winds up to 300 miles per hour
Hurricane
a large, swirling, low-pressure system that forms over water, winds up to 150 miles per hour
Blizzard
a winter storm that only occurs if the winds are 56 km/h, the temperature is low, visibility is less than 400m in falling or blowing snow, and if these conditions persist for 3 hours or more
Meteorologist
studies weather and uses information from Doppler radar, weather satellites, computers, and other instruments to make weather maps and provide forecasts
Station Model
indicates weather conditions at a specific location using a combination of symbols on a map
Isotherm
line drawn on a weather map that connects points having equal temperature
Isobar
lines drawn on a weather map that connect points having equal atmospheric pressure; also indicate the location of high and low pressure areas and can show wind speed
Rain
drops of water that fall from a cloud through air that is above freezing
Snow
precipitation that forms directly as a solid because the air below freezing
Sleet
precipitation that passes through a layer of freezing temperatures and forms small ice pellets
Hail
pellets of ice that form in cumulonimbus clouds during a thunderstorm when water freezes in layers around a small nucleus of ice
Barometer
an instrument used to measure atmospheric pressure
Cloud
when millions of tiny drops of water around dust particles form from condensed humid air
Cirro
high elevation clouds, above 6000 meters
Alto
middle elevation clouds, 2000-6000 meters
strato
low elevation clouds, below 2000 meters
Cirrus
wispy, feathery, high, thin clouds made of ice crystals
Cumulus
thick, fluffy, cottonball, white clouds often with flat bases
Stratus
layered, thin and smooth sheets of clouds often at low altitudes
Nimbus
clouds that are dark, full of water, and usually lead to rain
North Pacific
cold, moist, top left of U.S. map
Canadian
cold, dry, top of U.S. map
North Atlantic
cold, moist, top right of U.S. map
South Pacific
warm, moist, bottom left of U.S. map
Mexico
warm, dry, bottom of U.S. map
Gulf of Mexico
warm, moist, bottom right of U.S. map
Warm Front
warm air mass overtakes cold air mass
Cold Front
cold air mass overtakes warm air mass
Stationary Front
boundary between two air masses not moving in relation to each other
Occluded Front
involves three air masses of different temperatures - colder air, cool air, and warm air - cold air mass moves toward cool air with warm air between the two