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61 Cards in this Set

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  • Back
temperature
measurement of how rapidly r slowly molecules move around
heat
transfer of energy that occurs because of a difference in temperature
dew point
temperature to which air must be cooled a t constant pressure to reach saturation
condensation
occurs when matter changes state form a gas to a liquid
humidity
amount of water vapor in the air
relative humidity
ration of water vapor in a volume of air compared to how much water vapor that volume of air is capable of holding
LCL
height at which condensation occurs
stability
ability of an air mass to resist rising
condensation nuclei
small particles in the atmosphere around which cloud droples can form
stratus
clouds that are sheers or layers that cover much or all of the sky

water droplets/cold front
altostratus
sun shines through thin gray fibers

water droplets/long durations of rain or snow
altocumulus
flatbottombed masses of gray-white

water droplets/possible rain or thunderstorm
cirrus
delicate white fibers

tiny ice crystals/fair weather
cirrocumulus
thin white rippled layers

tiny ice crystaks/warm front
cirrostratus
shapeless white veil

tiny ice crystals/rain wihin 24 hrs
nimbostratus
large thick dark gray patches

water droplets/continous rain or snow
cumulonimbus
tops take shape of anvils

tiny ice crystals;water droplets/ thunderstorm and heavy rain
coalescence
occurs when cloud droplets collide and join together to form a larger droplet
precpitation
includes all forms of water both liquid and soild that fall from clouds including rain, snow, sleet, and hail
water cycle
The cycle of evaporation and condensation that controls the distribution of the earth's water as it evaporates from bodies of water, condenses, precipitates, and returns to those bodies of water
evaporation
process of water changing from a liquid to a gas
meterology
The science that deals with the phenomena of the atmosphere, especially weather and weather conditions
air mass
large body of air that takes on the characteristics of the area over which it forms
weather
current state of the atmosphere, including short -term variations that affect our lives
climate (def 1)
describes the average weather over a long period of time and is usually averaged over the course of 30 years or more
continental tropical
warm and dry air mass
maritime tropical
warm and humid air mass
continental polar
cold and dry air mass
arctic
cold air mass
maritime polar
cold and humid air mass
Doppler radar
Doppler radar
weather satellite
robotic spacecraft that observe changes in terrestrial weather patterns
thermometer
An instrument for measuring temperature
barometer
An instrument for measuring atmospheric pressure
anemometer
used to measure windspeed
hygrometer
measures relative humidity
radiosonde
a ballon-borbe package of sensors
gathers upper-level data
Doppler effect
change in wave, frequency taht occurs in energy, such as sound or light, as that energy that moves toward
ozone
a molecule of oxygen containing three oxygen atoms
troposphere
the layer closest to Earth's surface, contains most of the mass of the atmosphere, including water vapor
mesosphere
the atmospheric layer above the stratopause
stratosphere
above the tropopause
a layer made up primarily of concentrated ozone
thermosphere
the atmospheric layer above the menopause that contains lonly a minute portion of the atmosphere's mass
exosphere
composed of light gases
outermost layer of Earth's atmosphere
conduction
the transfer of heat through matter by molecular activity
convection
the transfer of heat by the movement of a mass or substance
radiation
the transfer of energy(heat) through space by electromagnetic waves
trade winds
first major wind zone
flows at 30 degrees north and south latitude
westerlies
second major wind zone
flows between 30 degrees and 60 degrees north and south latitude in a circulation patern opposite that of the trade winds
polar easterlies
third major wind zone
lies between 60 latitude and the poles
jet stream
narrow bands of high altitude, westerly winds that flow at speeds up to 185 km/h at elevations of 10.7 km to 12.2 km
warm front
advancing warm air displaces cold air
developes a gradual frontal slope
cold front
cold, dense air displaces warm air and forces the arm air up along a steep front
occluded fronts
the result of a cold air mass overtaking a warm front, eding the warm air upward
stationary front
the result of tow air masses meeting and neither advancing air into he other's territory, staying the boundary between them
station model
record of weather data for a particular site at a particular time
digital forecast
a forecast that relies on numerical data
short range forecast
A weather forecast made for a time period generally not greater than 48 hours in advance
long range forecast
A weather forecast covering periods from 48 hours to a week in advance (medium-range forecast), and ranging to even longer forecasts over periods of a month, a season, and so on
climate (def 2)
describes annual variaitopns of temperature, precipitaion, wind andother weather variables
El Nino
warm ocean current that occasionally develops off western cost of South America that causes many short-term climate changes