Precipitation.

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Presentation transcript:

Precipitation

Facts about air we need to know Warm air is lighter than cold air Warm air holds more moisture than cold air Water holds heat longer than land Air cools as it rises When air passes over water, it picks up moisture

Reasons why air may rise It is forced up by relief (mountains) It absorbs heat from the earth’s surface It is pushed up by a cooler denser (heavier) air mass

Air Pressure Air has weight = air pressure Low Pressure High Pressure Warm air rising Bad weather High Pressure Cold air falls towards the earth Good Weather When a pressure goes from High to Low = STORM

Types of Precipitation 1. Relief (Mountain) 2. Frontal (Battle of the sky)

Relief Precipitation Warm ocean air gains moisture Warm air is forced to rise over the hill Air cools and condenses to form clouds = Precipitation Air sinks and is warmed so it can hold more moisture and less rain.

Frontal Precipitation (aka Battle of the sky) Cold, dense (heavy) air mass hits less dense, warm moist air, forcing it up As air mass rises, it cools. Condenses to form clouds and precipitation. Moisture falls through cold air below to cool the earth’s surface.