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Unit 5 Chap. 2

Chapter 2 Weather

TermDefinition
weather The atmospheric conditions, along with short term changes, of a certain place at a certain time.
air pressure The pressure that a column of air exerts on the air or a surface below it.
humidity The amount of water vapor in the air.
relative humidity The amount of water vapor present in the air compared to the maximum amount of water vapor the air could contain at that temperature.
dew point Temperature at which air is saturated and condensation can occur.
precipitation Water, in liquid or solid form, that falls from the atmosphere.
water cycle The series of natural processes by which water continually moves through the hydrosphere.
high-pressure system A large body of circulating air with high pressure at its center and lower pressure outside the system
low-pressure system A large body of circulating air with low pressure at its center and higher pressure outside of the system.
air mass A large area of air that has uniform temperature, humidity, and pressure.
front A boundary between two air masses.
tornado A violent, whirling column of air in contact with the ground.
hurricane An intense tropical storm with winds exceeding 74 mph (119 km/h)
blizzard A violent winter storm characterized by freezing temperatures, strong winds, and blowing snow.
surface report A description of a set of weather measurements made on Earth’s surface.
upper-air report A description of wind, temperature, and humidity conditions above Earth’s surface.
Doppler radar A specialized type of radar that can detect precipitation as well as the movement of small particles, which can be used to approximate wind speed.
isobar Lines that connect all places on a map where pressure has the same value.
isotherm Lines that connect places on a map with the same temperature.
computer model Detailed computer programs that solve a set of complex mathematical formulas.
density mass divided by volume
cloud liquid water droplets suspended in the air
Created by: RWare
 

 



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