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Sky conditions are estimated in terms of how many eighths of the sky are covered in cloud, ranging from 0 oktas (completely clear sky) through to 8 oktas (completely overcast). In addition, in the SYNOP code there is an extra cloud cover indicator '9' indicating that the sky is totally obscured (i.e. hidden from view), usually due to dense fog ...
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.
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.
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.
The total solar eclipse is just days away and the cloud cover forecast is looking grim for some regions, but there’s still hope because not all cloudy skies are the same. Why a cloudy forecast ...
That said, Reiff says the ability to view an eclipse during cloudy weather depends on the extent of the clouds. “If there’s widespread thunderclouds, I’m going to stay where I am,” she says.
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 ]
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.
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