Clouds & precipitation

Expand or is compressed allowed when air is allowed

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Unformatted text preview: n When When air is allowed to expand, it cools, when air is compressed, it warms when Adiabatic Temperature Change Adiabatic A temperature change which results when temperature air is expanded or compressed without addition or removal of heat addition Dry adiabatic rate Dry The The rate of warming/cooling of unsaturated air. unsaturated Unsaturated air cools at a rate of 10oC for for every 1000 meters of ascent (1oC per 100 every per meters or 5.5oF per 1000 feet) meters Wet adiabatic rate Wet The The rate of adiabatic temperature change in saturated air saturated The wet adiabatic rate varies based on the The content of moisture in the air content Ranges from 5oC per 1000 meters of air per (high moisture content) to 9oC per 1000 (high per meters of air (dry air) meters Atmospheric stability Atmospheric When When air rises, it cools and eventually produces clouds produces Clouds vary in size due to the stability of Clouds the air the Air is stable if it tends to resist vertical Air displacement (the air sinks) displacement Air is unstable if it rises from its original Air position position Stable Stable air resists vertical movement, whereas unstable air ascends freely because of its buoyancy. because Clouds associated with the lifting of Clouds unstable air are towering and often generate thunderstorms or other violent weather weather Fog Fog Fog Fog is a cloud with its base at or very near the ground the Clouds result when air rises adiabatically, Clouds whereas fogs are a consequence of radiation cooling Fog form when enough water vapor is Fog added to bring about saturation added Types of fogs Types Advection fog Radiation fog Upslope fog Advection fog Advection Forms Forms when warm, moist air moves over a cool surface cool Example: Cape Disappointment, Example: Washington (foggiest place in the world) Washington Radiation fog Radiation Forms Forms on cool, clear nights, when Earth’s surface cools rapidly by radiation surface Largest pockets are usually found in river Largest valleys valleys Upslope fog Upslope Fog Fog that is prodcued when humid air moves up a gradually sloping plain or up the steep slopes of a mountain the Most common in the Great Plains of the Most United States United Precipitation Precipitation Any Any form in w...
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