22 terms

Earth Science Ch. 12

study study of weather
currrent state of the atmosphere
the weather in some location averaged over some long period of time
air mass
a huge body of air that has similar temperature, humidity, and air pressure at any given height
air mass modification
the exchange of heat or moisture with the surface over which an air mass travels
Coriolis effect
The way Earth's rotation makes winds in the Northern Hemisphere curve to the right and winds in the Southern Hemisphere curve to the left.
trade winds
global wind system that occurs at 30 degrees latitude
prevailing westerlies
winds that blow west to east between 30 and 60 degrees in the northern and southern hemispheres
polar easterlies
Prevailing winds that blow from east to west between 60degrees-90degrees latitude in both hemisphere.
jet stream
a high-speed high-altitude airstream blowing from west to east near the top of the troposphere
(meteorology) the atmospheric phenomenon created at the boundary between two different air masses
measuring instrument for measuring temperature
an instrument that measures atmospheric pressure
a gauge for recording the speed and direction of wind
measuring instrument for measuring the relative humidity of the atmosphere
instrument for measuring height of cloud ceiling above earth
a package of instruments that is carried aloft by balloons to measure upper atmosphere conditions, including temperature, dew point, and wind velocity
Doppler effect
change in the apparent frequency of a wave as observer and source move toward or away from each other
station model
indicates weather conditions at a specific location, using a combination of symbols on a map
Line drawn on a weather map that connects points of equal or constant values
digital forecast
weather forecast that uses numerical data to determine how atmosphereic variables change over time
analog forecast
invloves comparing current weather patterns to patterns that look place in the past