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| an instrument that measures the force and direction of the wind. |
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| a divice that rotats freely to show the direction of the wind |
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| an instrument measuring changes in atmospheric pressure |
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| very cloudy, with no sun showing |
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| a device used to measure the amount of rain that falls in a particular location. |
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| the boundary zone of an advancing cold-air mass as it replaces warmer air |
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| the gently sloping advancing edge of a warm air mass that displaces colder air, bringing a temperature increase and heavy rain where the front makes contact with the ground |
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| mesurment that compares the amount of water vapor in the air with the amount the air with the amount of water it can hold at a certan temp. |
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| teh temp. at which a voulume of air cannot hold any more water vapor |
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| a large body of air having simaler propertys of wather conditions |
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| the boundrys between warm and cold air masses |
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