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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 flight visibility at the cruising altitude of the aircraft must be at least 5 miles and the weather at the destination aerodrome must be forecast to have a sky condition of scattered cloud or better, a ground visibility of 5 miles or greater with no forecast of precipitation, fog, thunderstorm or blowing snow, and that these conditions must ...
A broken layer of clouds passes below a solar eclipse in Mumbai, India, on December 26, 2019. - Vijayanand Gupta/Hindustan Times/Getty Images Any thinner clouds or gaps in clouds will allow for a ...
BKN003 OVC010 indicates a broken (5 ⁄ 8 to 7 ⁄ 8 of the sky covered) cloud layer at 300 ft (91 m) above ground level (AGL) and an overcast (8/8 of the sky covered) layer at 1,000 ft (300 m). M02/M02 indicates the temperature is −2 °C (28 °F) and the dew point is −2 °C (28 °F). An M in front of the number indicates a negative Celsius ...
The clouds were broken at 2,000 ft (610 m) AMSL with tops at 4,000 ft (1,200 m) and an overcast layer at 11,000 ft (3,400 m) AMSL. The temperature is −14 degrees Celsius and the winds are from the northeast (030 degrees true) at 45 kn (83 km/h).
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 ...
The Department of Homeland Security, Federal Aviation Administration, FBI and the Pentagon issued a joint statement this week, saying they have uncovered nothing nefarious related to the sightings.