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The average cloud cover of the Earth, 2005-2013. Colors range from blue (no clouds) to white (totally cloudy). [6] (click for more detail) Cloud cover values only vary by 3% from year-to-year averages, whereas the local, day-to-day variability in cloud amounts typically rises to 30% over the globe.
If conditions are completely clear, the circle or triangle is empty. If conditions are partly cloudy, the circle or triangle is partially filled in. [3] The cloud cover shape has different looks depending upon how many oktas (eighths of the sky) are covered by cloud. A sky half full of clouds would have a circle that was half white and half black.
A surface weather analysis for the United States on October 21, 2006. By that time, Tropical Storm Paul was active (Paul later became a hurricane). Surface weather analysis is a special type of weather map that provides a view of weather elements over a geographical area at a specified time based on information from ground-based weather stations.
SUNDAY: Cloudy Morning. Then, Clearing. High 79. Wind S 10-15. SUNDAY NIGHT: Increasing Clouds. Low 63. Wind S 10-15.MONDAY: Mostly Cloudy. 40% Chance of Showers & Thunderstorms. High 79. Wind S ...
Aviation interests have their own set of weather maps. One type of map shows where VFR (visual flight rules) are in effect and where IFR (instrument flight rules) are in effect. Weather depiction plots show ceiling height (level where at least half the sky is covered with clouds) in hundreds of feet, present weather, and cloud cover. [27]
Near perfect weather is on tap for Halloween festivities tomorrow. Clear skies with late afternoon temperatures in the 70s quickly cooling into the 50s and 60s over the course of the evening.
Clear Sky Charts (called clocks until February 29, 2008) are web graphics which deliver weather forecasts designed specifically for astronomers. They forecast the cloud cover , transparency and astronomical seeing , parameters which are not forecast by civil or aviation forecasts. [ 1 ]
The cloudiest place in the United States is Cold Bay, Alaska, with an average of 304 days of heavy overcast (covering over 3/4 of the sky). [8] In addition to these oceanic climates, certain low-latitude basins enclosed by mountains, like the Sichuan and Taipei Basins , can have sunshine duration as low as 1,000 hours per year, as cool air ...