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Weather Factors

Weather and Climate: Chapter Two

thermometer an instrument used to measure temperature.
wind the horizontal movement of air from an area of high pressure to an area of low pressure.
anemometer an instrument used to measure wind speed.
wind vane an instrument used to measure wind direction.
local winds winds that blow over short distances.
global winds winds that blow steadily from specific directions over long distances.
jet streams bands of high-speed winds about 10 kilometers above Earth's surface.
evaporation the process by which water molecules escape into the air as water vapor. (Think: The water cycle)
humidity the measure of the amount of water vapor in the air.
psychrometer an instrument used to measure the relative humidity in the air. (Think: water vapor)
clouds formed when water vapor in the atmosphere become liquid water or ice particles.
cumulus clouds that form less than two kilometers above the ground and look like fluffy, rounded piles of cotton.
stratus clouds that forms in flat layers.
cirrus wispy, feathery clouds mostly made of ice crystals that form at high levels.
precipitation any form of water that falls from clouds and reaches Earth's surface.
rain precipitation in the form of liquid water.
sleet precipitation in the form of tiny ice particles less than 5 millimeters in diameter.
freezing rain raindrops that freeze when they land on a cold surface.
hail precipitation in the form of ice particles greater than 5 millimeters in diameter.
snow precipitation in the form of water vapor that is converted into ice crystals.
rain gauge an instrument that measures the amount of rainfall.
droughts long periods of low precipitation.
Created by: wtr6thscience