Test: Weather
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what two things classify an air mass?
temperature and amount of moisture
define an air mass.
air mass- a large body of air with similar characteristics throughout.
define front.
when two air masses meet & form a border
what is a cold front?
when a cold air mass meets a warm air mass
what type of weather do cold fronts bring?
rain develops and thunderstorms occur.
what is a warm front?
when a warm air mass catches up to a cold air mass.
what kind of weather do warm fronts bring?
clear skies
what is a stationary front?
a front that stops moving.
what time of weather do stationary fronts bring?
causes constant snow or rainfall leading to several inches of snow or it could even cause a flood.
what symbol is used for warm fronts?
red, semi circles
what symbol is used for cold fronts?
blue, triangles
what are the lines in a pressure diagram called?
isobars
winds always blow from ________.
high pressure to low pressure
what is the instrument that measures air pressure?
barometer
how does a barometer work?
when the mercury is high, there is high pressure. when the mercury is low, there is low pressure
what direction do polar easteries blow?
east to west
what direction do the westerlies blow?
west to east
what zone is windless?
the doldrums
polar easterlies have the strongest winds because of the __________
Coriolis effect
relative humidity is relative to ____________.
what’s happening in the atmosphere
which is more active? relative humidity or dew point?
dew point
what is water that evaporates from the leaves on trees?
transpiration
what is condensation?
water droplets forming together
what is evaporation?
water turning into a gas and rising into the atmosphere