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what is relative humidity?
the amount of moisture that the air contains compared with the maximum amount it can hold at a particular temperature
what are some characteristics of stratus clouds?
form in layers,blocks out the sun, covers large areas of sky
what is a source region?
an air mass that gets its moisture and temperature characteristics from the area over which it forms
what are the different types of air masses that influence weather in north america?
continental polar and maritime polar
why arent there fronts in the tropics?
because only warm air masses exist there and fronts need cold and warm air
what is a thunderstorm?
small intense weather system producing strong winds, heavy rain, lightning, and thunder
what is lightning and how is it created?
lightning is a large electrical charge that occurs between 2 oppositley charged surfaces
how are tornadoes produced?
small rotating columns of air that causes high winds speeds and low pressure
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