Low level clouds are generally based at or below 6,500 feet above ground, mid-level clouds are generally based between 6,500 feet and 15,000 feet above ground, and high level clouds are generally based more than 15,000 feet above ground. Check how clouds move and where precipitation can be expected. On the following pages I will provide photographic examples and brief descriptions of the various cloud types that are identified for the purposes of sky condition observations. One type of observation is a description of sky condition, the amount and character of clouds visible in the sky. Cloud cover on the map anywhere in the world. For example, a cloud deck based at 10,000 feet above the ground indicates sufficient rising air and moisture at that level, but does not necessarily reflect the state of the atmosphere below 10,000 feet (or above the top of the cloud deck). These ingredients are usually only required at the altitude at which the clouds are forming or developing. ![]() The interactive map makes it easy to navigate. OVER 400 APT GROUND STATIONS GLOBAL CLOUD COVER DAILY WEATHER FORECASTS. See the latest Washington RealVue weather satellite map, showing a realistic view of Washington from space, as taken from weather satellites. ![]() This is coded according to established categories, detailed on the three pages linked below.Ĭlouds need two major ingredients to form - rising air and moisture. DATA USE GLOBAL CLOUD COVER ( AVCS ) SATELLITE LOCAL CLOUD COVER ( APT ). One type of observation is a description of "sky condition", the amount and character of clouds visible in the sky. One of the many functions of the National Weather Service is to collect weather data and observations.
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