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- "Mixture of sun and clouds" and "variable clouds" are often terms that are used. These are used when the cloud cover percentage will change during the day or when cloud cover will be different across the forecast region.
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Mar 14, 2019 · The "sky cover" represents the percentage of sky obscured by clouds, as would be visible to an observer (or weather instrument) at the Earth's surface.
Feb 18, 2024 · The “sky cover” chart provides information about the amount of cloud cover expected in a particular area during a specific time period. It helps you understand how much of the sky will be covered by clouds and how it may affect weather conditions.
- How We Measure Cloud Type
- How We Measure Cloud Amount
- How We Measure Cloud Base Height
The standard method for classifying clouds is based on the World Meteorological Organisation criteria. The classification is made in terms of the level of the cloud (high, medium or low) and various cloud genera specified by the cloud form and its features. Common types of cloud include cumulus, cumulonimbus, stratocumulus and stratus at low levels...
At any time different types of cloud at different heights above the ground may be visible from an observing station. To cater for such variability both the total cloud amount and partial cloud amounts are reported. Total cloud amount is the fraction of the sky covered by cloud of any type or height above the ground. Partial cloud amount is the frac...
Cloud base is readily measured by instrument to a reasonable level of accuracy. The type of cloud base recorder used widely at synoptic observing stations is shown below. It employs a pulsed diode laser LIDAR (light detection and ranging) technology whereby short laser pulses (eye safe) are sent out in a vertical or near vertical direction. The bac...
Feb 6, 2009 · Sky Condition. The sky condition describes the predominant/average sky cover based on percent of the sky covered by opaque (not transparent) clouds. If a high probability of precipitation (60% or greater) is expected, then the sky condition may be omitted since it is inferred from the precipitation forecast. Sky Condition.
- NWS Definition (LST)
- 6am-noon
- Noon-6pm
- 6am-6pm
Jun 1, 2024 · A cloud coverage chart, also known as a sky cover or cloud cover chart, is a graphical representation that displays the amount of cloud cover in the sky at a given location and time. To interpret a cloud coverage chart, look for the following:
The fraction of the sky (celestial dome) covered by cloud is called sky cover, cloud cover, or cloud amount. It is measured in eights (oktas) according to the World Meteorological Organization.
Jan 4, 2021 · Variable sky conditions are no exception. You will see normal cloud reporting with a “V” for variable thrown in the mix. So BKN014 V OVC means there is a 1400 foot layer that varies between broken and overcast.