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The height above the ground or water of the base of the lowest layer of cloud below 6000 meters (20,000 feet) covering more than half the sky. [2] United Kingdom The vertical distance from the elevation of an aerodrome to the lowest part of any cloud visible from the aerodrome which is sufficient to obscure more than half of the sky. [3] United ...
Cloud-cover symbols used on weather teleprinters and aviation reports in the US [6] In the early 20th century, it was common for weather maps to be hand drawn. The symbols for cloud cover on these maps, like the modern symbols, were drawn inside the circle marking the position of the weather station making the measurements.
The updraft under the cloud is mostly due to buoyancy, but there is also a large pressure difference between the base and the top of the cumulonimbus (larger than would be found in this height range outside the cloud) and local low-level mechanical lifting such as the lifting generated by a downburst. The two last phenomena can overcome a ...
Fractus clouds, also called fractostratus or fractocumulus, [1] are small, ragged cloud fragments that are usually found under an ambient cloud base. They form or have broken off from a larger cloud, and are generally sheared by strong winds , giving them a jagged, shredded appearance.
Aviation weather briefing service [6] Available at designated FSS's AWG American Wire Gage: The larger the size number, the smaller the wire diameter. AWIS Aviation weather information service [6] Available at FSS: AWO All weather operations AWOS Automated weather observation system [6] Automated METAR reporting system AWWS Aviation weather web ...
A broken sky has thin strips of clear blue peeking through abundant clouds. Broken clouds don’t form a uniform layer across the sky; they can be thinner in spots and thicker in others.
The discovery of 90377 Sedna in 2003, together with a few other objects discovered around that time such as (148209) 2000 CR 105 and (612911) 2004 XR 190, has motivated discussion of a category of distant objects that may also be inner Oort cloud objects or (more likely) transitional objects between the scattered disc and the inner Oort cloud. [2]
The presence of clouds or water droplets leads to a very strong return signal compared to background levels, which allows for cloud heights to be easily identified. [ 14 ] Since the instrument will note any returns, it is possible to locate any faint layer where it occurs, additionally to the cloud's base, by looking at the whole pattern of ...