Types of Precipitation

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Convectional precipitation results from the heating of the earth's surface that causes air to rise rapidly. As the air rises, it cools and moisture condenses into clouds and precipitation. This type of  precipitation is common in the prairie provinces.
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Frontal precipitation results when the leading edge( front) of  a warm air mass meets a cool air mass. The warmer air mass is forced up over the cool air. As it rises the warm air cools, moisture in the air condenses, clouds and precipitation result. This precipitation is common in Atlantic Canada. 
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Orographic precipitation results when warm moist air of the ocean is forced to rise by large mountains. As the air rises it cools, moisture in the air condenses and clouds and precipitation result on the windward side of the mountain while the leeward side receives very little. This is common in British Columbia.