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- The NWS definition states that between 3/8 and 5/8 of the sky is covered by clouds when it's classified as partly cloudy or partly sunny. Sometimes, a "mix of sun and clouds" is used by some forecasters instead of "partly sunny" during the daytime hours, though it is not an official NWS term.
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What does cloud cover mean?
Our cloud cover map shows where cloud is forecast across the UK. Includes cloud cover forecasts up to 5 days.
Cloud cover map – your current and reliable cloud forecast & cloud prediction. You have planned a trip to the countryside and want to enjoy the sunshine and the blue sky? Then you should take a look at our cloud cover map first!
Sep 29, 2023 · In summary, weather is considered overcast when dense, homogeneous cloud cover blocks out most or all available sunlight. Cloudy weather denotes substantial cloud amount with breaks that allow sun and patches of clear sky to be directly viewed between individual clouds or groups of clouds.
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One of the ways in which clouds are formed is by the heating of the earth's surface which causes air to rise which condenses water droplets to form clouds. Heating of the earth's surface is usually done by the sun, but wildfires and volcanoes can also cause intense heating which leads to the rapid formation of clouds known as pyrocumulus. If enough...
Feared by paragliders and hand gliders, the base of cumulus clouds can be a dangerous place when thermal updrafts contribute to a phenomenon known as 'cloud suck'. In Februrary 2007, paraglider Eva Wiśnierska-Cieślewicz was sucked up into a cumulonimbus cloud rapidly climbing at a speed of 45 mph to an altitude of 9,946 m (32,600 feet) - close to t...
The reason clouds are white and the sky is blue is all to do with the colour spectrum of light. Light from the sun starts out white but becomes scattered by particles in the sky. Atmospheric particles in the sky scatter away blue light more than other colours which gives the sky its blue appearance. But as light passes through a cloud it interacts ...
The earth's atmosphere is a very cloudy place. NASA's Earth Observatory estimates that at any given time, around 67%of Earth's surface is covered by cloud. Based on observatory data between 2002 and 2015, NASA's Aqua Satellite image (below) clearly shows three zones which are the cloudiest, over the mid-latitudes and over the equator. These zones a...
While there are many factors that will determine the exact amount of water vapour a cloud holds (e.g. temperature, altitude, pressure etc.) we can work with an average of about 5 g of water per cubic metre of cloud. This means an average size cumulonimbus would weight about 400,000 kg, roughly the same weight as an Airbus A380. Find out more in a d...
The title of highest cloud goes to the rare but beautiful but noctilucent cloud. They hover at around 60,000 m (200,000 feet) and are too faint to be seen in daylight. They become visible during twilight when sunlight from below the horizon illuminates them to reveal their faint ghostly outlines.
When making observations at a weather station, cloud cover is measured in 'oktas' (eights of a sky). A reading of zero oktas would mean there is not a cloud in the sky, which is termed 'enubilous'. Across cultures clouds can have very different meanings, in the UK they tend to have a relatively negative symbolism, for instance, a cloud on the horiz...
The cloud cover is correlated to the sunshine duration as the least cloudy locales are the sunniest ones while the cloudiest areas are the least sunny places, as clouds can block sunlight, especially at sunrise and sunset where sunlight is already limited.
How we measure cloud. Take a look at how we observe the type, amount and height of clouds. The large scale distribution of cloud is best measured from space in either the visible or infra red...
Oct 19, 2023 · Cloud cover is an important component of understanding and predicting the weather. Not only does cloud cover impact sky conditions and inform precipitation predictions, it also helps regulate the temperature that occurs in a region.
