![]() Certain airports may have minimum ceiling recommendations, based on local conditions and terrain. Private non-revenue operators have more flexibility in terms of sourcing weather data and providers. This may affect the charter operator’s ability to operate to certain locations, or require a flight diversion, even though actual weather may differ from an official forecast. Part 135 charter (non-scheduled commercial) operators must, by regulatory requirement, use official government weather forecasts and not forecasts provided by any weather provider. We find that these weather observers are generally the most reliable source in determining accurate ceilings. In addition, many airports have a certified weather observer assist with and oversee AWOS data. Automated Weather Observing Systems (AWOS) at larger airports routinely measure cloud heights and ceilings. Cloud cover is reported in terms of 1/8th of sky cover with 1-2/8th being FEW, 3-4/8ths being SCT, 5-7/8th being BKN and 8/8 denoted at OVC. Cloud cover and measurement of ceilingĭifferent types of cloud cover conditions include SKC (sky clear), FEW (trace), SCT (scattered), BKN (broken) and OVC (overcast). Your forecaster will provide insights regarding expected changes to ceilings, as well as other weather events such as fog is expected to move in/out of your destination. If the sky is totally obscured, height of vertical visibility is used as the ceiling. Definition of ceilingĬeiling at your intended destination may be defined as the lowest broken or overcast cloud layer. In some cases, the crew may specify a minimum ceiling height, perhaps 3,000 ft, while in other cases they may require higher minimum ceiling heights. Ceiling requirements varyĭepending upon the crew, level of expertise and flight department SOPs, different requirements may be considered in terms of ceilings. The following is an overview of what you need to know: 1. For the most accurate planning data it’s always important to work with your aviation meteorologist, both during the trip planning phase and closer to day of departure. Ceilings impact visual flight rule (VFR) and instrument flight rule (IFR) operations differently, and minimum ceiling considerations will depend on type of flight, operator’s standard operating procedure (SOP), pilot experience, and operator comfort level. Conditions are most significant when sky is totally obscured and particularly when local terrain is also a factor. Ceilings at arrival and departure airports – measured cloud base height relative to the ground – impact business aircraft operations around the world.
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