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How do I interpret this “sky cover” chart?


What is the best way to stay safe while photographing lightning storms?How to find Cloud cover data in GFS grib modelsHow does MSLP change with elevation? trying to interpolate MSLPHow to interpret cloud coverage chart?How to calculate air temperature for given time, location and altitude?Human hurricane forecasting?Can I use radar data to estimate snowfall, or is there a better way?Relationship between pressure, temperature and density in meterologyEstimating Average RainfallAre there “transparent” clouds?













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$begingroup$


The image below is a screenshot of forecasted sky cover in percentage for various parts of Arizona. Is the sky cover percentage the percentage of each pixel that has cloud, or is it the percentage of a circle with a certain radius where a certain pixel is the center? Not sure how to word it more clearly.enter image description here










share|improve this question









$endgroup$
















    2












    $begingroup$


    The image below is a screenshot of forecasted sky cover in percentage for various parts of Arizona. Is the sky cover percentage the percentage of each pixel that has cloud, or is it the percentage of a circle with a certain radius where a certain pixel is the center? Not sure how to word it more clearly.enter image description here










    share|improve this question









    $endgroup$














      2












      2








      2


      1



      $begingroup$


      The image below is a screenshot of forecasted sky cover in percentage for various parts of Arizona. Is the sky cover percentage the percentage of each pixel that has cloud, or is it the percentage of a circle with a certain radius where a certain pixel is the center? Not sure how to word it more clearly.enter image description here










      share|improve this question









      $endgroup$




      The image below is a screenshot of forecasted sky cover in percentage for various parts of Arizona. Is the sky cover percentage the percentage of each pixel that has cloud, or is it the percentage of a circle with a certain radius where a certain pixel is the center? Not sure how to word it more clearly.enter image description here







      meteorology weather-forecasting






      share|improve this question













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      share|improve this question




      share|improve this question










      asked 4 hours ago









      user6847056user6847056

      964




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          1 Answer
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          2












          $begingroup$

          The "sky cover" represents the percentage of sky obscured by clouds, as would be visible to an observer at the Earth's surface.



          The most direct reference I could find to this quantity was in this archived presentation from the American Meteorological Society's 2014 Annual Meeting: "The United States Federal Meteorological Handbook (FMH) No. 1 defines sky cover as “the amount of the celestial dome hidden by clouds and/or obscurations”.



          While I could not locate this particular handbook, there is supporting evidence in the NWS Products and Services Reference Guidebook, specifically Section 9, Tables and Abbreviations: The “sky condition” describes the average percentage of the sky that is covered by opaque clouds (not transparent to light) at a given time, followed by a tabular description of the percentile sky cover forecast interpolated to the forecast image in question:



          Table describing sky condition and cloud cover forecast parameters



          Slight differences in terminology aside, both of these descriptions equivalently refer to the portion of sky obscured by clouds. For typical weather forecasts (as in the example in question), either would be interpreted as describing the sky as it would be visible to an observer at a given point on the Earth's surface - the visible "celestial dome". See also the definition quoted here from the 2nd edition of the American Meteorology Society's glossary, defining cloud cover as "observed from a particular location," in this case the Earth's surface.






          share|improve this answer











          $endgroup$








          • 1




            $begingroup$
            +1. Is sky cover the same as cloud cover ? Can you clarify that in your answer ?
            $endgroup$
            – gansub
            3 hours ago






          • 1




            $begingroup$
            -en.wikipedia.org/wiki/Cloud_cover
            $endgroup$
            – gansub
            3 hours ago










          • $begingroup$
            Thanks, a good clarification as both refer to the same quantity but exact terminology is variable depending on the source or forecast. Added that and a reference to the definition at the top of the wikipedia article - interestingly, the AMS glossary is my starting point for questions like this but the latest edition omits the mention of any viewing location - still clearly referring to the same thing, though.
            $endgroup$
            – dplmmr
            3 hours ago










          • $begingroup$
            welcome. I deal with European models mostly and cloud cover is the term used.
            $endgroup$
            – gansub
            3 hours ago










          Your Answer





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          2












          $begingroup$

          The "sky cover" represents the percentage of sky obscured by clouds, as would be visible to an observer at the Earth's surface.



          The most direct reference I could find to this quantity was in this archived presentation from the American Meteorological Society's 2014 Annual Meeting: "The United States Federal Meteorological Handbook (FMH) No. 1 defines sky cover as “the amount of the celestial dome hidden by clouds and/or obscurations”.



          While I could not locate this particular handbook, there is supporting evidence in the NWS Products and Services Reference Guidebook, specifically Section 9, Tables and Abbreviations: The “sky condition” describes the average percentage of the sky that is covered by opaque clouds (not transparent to light) at a given time, followed by a tabular description of the percentile sky cover forecast interpolated to the forecast image in question:



          Table describing sky condition and cloud cover forecast parameters



          Slight differences in terminology aside, both of these descriptions equivalently refer to the portion of sky obscured by clouds. For typical weather forecasts (as in the example in question), either would be interpreted as describing the sky as it would be visible to an observer at a given point on the Earth's surface - the visible "celestial dome". See also the definition quoted here from the 2nd edition of the American Meteorology Society's glossary, defining cloud cover as "observed from a particular location," in this case the Earth's surface.






          share|improve this answer











          $endgroup$








          • 1




            $begingroup$
            +1. Is sky cover the same as cloud cover ? Can you clarify that in your answer ?
            $endgroup$
            – gansub
            3 hours ago






          • 1




            $begingroup$
            -en.wikipedia.org/wiki/Cloud_cover
            $endgroup$
            – gansub
            3 hours ago










          • $begingroup$
            Thanks, a good clarification as both refer to the same quantity but exact terminology is variable depending on the source or forecast. Added that and a reference to the definition at the top of the wikipedia article - interestingly, the AMS glossary is my starting point for questions like this but the latest edition omits the mention of any viewing location - still clearly referring to the same thing, though.
            $endgroup$
            – dplmmr
            3 hours ago










          • $begingroup$
            welcome. I deal with European models mostly and cloud cover is the term used.
            $endgroup$
            – gansub
            3 hours ago















          2












          $begingroup$

          The "sky cover" represents the percentage of sky obscured by clouds, as would be visible to an observer at the Earth's surface.



          The most direct reference I could find to this quantity was in this archived presentation from the American Meteorological Society's 2014 Annual Meeting: "The United States Federal Meteorological Handbook (FMH) No. 1 defines sky cover as “the amount of the celestial dome hidden by clouds and/or obscurations”.



          While I could not locate this particular handbook, there is supporting evidence in the NWS Products and Services Reference Guidebook, specifically Section 9, Tables and Abbreviations: The “sky condition” describes the average percentage of the sky that is covered by opaque clouds (not transparent to light) at a given time, followed by a tabular description of the percentile sky cover forecast interpolated to the forecast image in question:



          Table describing sky condition and cloud cover forecast parameters



          Slight differences in terminology aside, both of these descriptions equivalently refer to the portion of sky obscured by clouds. For typical weather forecasts (as in the example in question), either would be interpreted as describing the sky as it would be visible to an observer at a given point on the Earth's surface - the visible "celestial dome". See also the definition quoted here from the 2nd edition of the American Meteorology Society's glossary, defining cloud cover as "observed from a particular location," in this case the Earth's surface.






          share|improve this answer











          $endgroup$








          • 1




            $begingroup$
            +1. Is sky cover the same as cloud cover ? Can you clarify that in your answer ?
            $endgroup$
            – gansub
            3 hours ago






          • 1




            $begingroup$
            -en.wikipedia.org/wiki/Cloud_cover
            $endgroup$
            – gansub
            3 hours ago










          • $begingroup$
            Thanks, a good clarification as both refer to the same quantity but exact terminology is variable depending on the source or forecast. Added that and a reference to the definition at the top of the wikipedia article - interestingly, the AMS glossary is my starting point for questions like this but the latest edition omits the mention of any viewing location - still clearly referring to the same thing, though.
            $endgroup$
            – dplmmr
            3 hours ago










          • $begingroup$
            welcome. I deal with European models mostly and cloud cover is the term used.
            $endgroup$
            – gansub
            3 hours ago













          2












          2








          2





          $begingroup$

          The "sky cover" represents the percentage of sky obscured by clouds, as would be visible to an observer at the Earth's surface.



          The most direct reference I could find to this quantity was in this archived presentation from the American Meteorological Society's 2014 Annual Meeting: "The United States Federal Meteorological Handbook (FMH) No. 1 defines sky cover as “the amount of the celestial dome hidden by clouds and/or obscurations”.



          While I could not locate this particular handbook, there is supporting evidence in the NWS Products and Services Reference Guidebook, specifically Section 9, Tables and Abbreviations: The “sky condition” describes the average percentage of the sky that is covered by opaque clouds (not transparent to light) at a given time, followed by a tabular description of the percentile sky cover forecast interpolated to the forecast image in question:



          Table describing sky condition and cloud cover forecast parameters



          Slight differences in terminology aside, both of these descriptions equivalently refer to the portion of sky obscured by clouds. For typical weather forecasts (as in the example in question), either would be interpreted as describing the sky as it would be visible to an observer at a given point on the Earth's surface - the visible "celestial dome". See also the definition quoted here from the 2nd edition of the American Meteorology Society's glossary, defining cloud cover as "observed from a particular location," in this case the Earth's surface.






          share|improve this answer











          $endgroup$



          The "sky cover" represents the percentage of sky obscured by clouds, as would be visible to an observer at the Earth's surface.



          The most direct reference I could find to this quantity was in this archived presentation from the American Meteorological Society's 2014 Annual Meeting: "The United States Federal Meteorological Handbook (FMH) No. 1 defines sky cover as “the amount of the celestial dome hidden by clouds and/or obscurations”.



          While I could not locate this particular handbook, there is supporting evidence in the NWS Products and Services Reference Guidebook, specifically Section 9, Tables and Abbreviations: The “sky condition” describes the average percentage of the sky that is covered by opaque clouds (not transparent to light) at a given time, followed by a tabular description of the percentile sky cover forecast interpolated to the forecast image in question:



          Table describing sky condition and cloud cover forecast parameters



          Slight differences in terminology aside, both of these descriptions equivalently refer to the portion of sky obscured by clouds. For typical weather forecasts (as in the example in question), either would be interpreted as describing the sky as it would be visible to an observer at a given point on the Earth's surface - the visible "celestial dome". See also the definition quoted here from the 2nd edition of the American Meteorology Society's glossary, defining cloud cover as "observed from a particular location," in this case the Earth's surface.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 3 hours ago

























          answered 3 hours ago









          dplmmrdplmmr

          708118




          708118







          • 1




            $begingroup$
            +1. Is sky cover the same as cloud cover ? Can you clarify that in your answer ?
            $endgroup$
            – gansub
            3 hours ago






          • 1




            $begingroup$
            -en.wikipedia.org/wiki/Cloud_cover
            $endgroup$
            – gansub
            3 hours ago










          • $begingroup$
            Thanks, a good clarification as both refer to the same quantity but exact terminology is variable depending on the source or forecast. Added that and a reference to the definition at the top of the wikipedia article - interestingly, the AMS glossary is my starting point for questions like this but the latest edition omits the mention of any viewing location - still clearly referring to the same thing, though.
            $endgroup$
            – dplmmr
            3 hours ago










          • $begingroup$
            welcome. I deal with European models mostly and cloud cover is the term used.
            $endgroup$
            – gansub
            3 hours ago












          • 1




            $begingroup$
            +1. Is sky cover the same as cloud cover ? Can you clarify that in your answer ?
            $endgroup$
            – gansub
            3 hours ago






          • 1




            $begingroup$
            -en.wikipedia.org/wiki/Cloud_cover
            $endgroup$
            – gansub
            3 hours ago










          • $begingroup$
            Thanks, a good clarification as both refer to the same quantity but exact terminology is variable depending on the source or forecast. Added that and a reference to the definition at the top of the wikipedia article - interestingly, the AMS glossary is my starting point for questions like this but the latest edition omits the mention of any viewing location - still clearly referring to the same thing, though.
            $endgroup$
            – dplmmr
            3 hours ago










          • $begingroup$
            welcome. I deal with European models mostly and cloud cover is the term used.
            $endgroup$
            – gansub
            3 hours ago







          1




          1




          $begingroup$
          +1. Is sky cover the same as cloud cover ? Can you clarify that in your answer ?
          $endgroup$
          – gansub
          3 hours ago




          $begingroup$
          +1. Is sky cover the same as cloud cover ? Can you clarify that in your answer ?
          $endgroup$
          – gansub
          3 hours ago




          1




          1




          $begingroup$
          -en.wikipedia.org/wiki/Cloud_cover
          $endgroup$
          – gansub
          3 hours ago




          $begingroup$
          -en.wikipedia.org/wiki/Cloud_cover
          $endgroup$
          – gansub
          3 hours ago












          $begingroup$
          Thanks, a good clarification as both refer to the same quantity but exact terminology is variable depending on the source or forecast. Added that and a reference to the definition at the top of the wikipedia article - interestingly, the AMS glossary is my starting point for questions like this but the latest edition omits the mention of any viewing location - still clearly referring to the same thing, though.
          $endgroup$
          – dplmmr
          3 hours ago




          $begingroup$
          Thanks, a good clarification as both refer to the same quantity but exact terminology is variable depending on the source or forecast. Added that and a reference to the definition at the top of the wikipedia article - interestingly, the AMS glossary is my starting point for questions like this but the latest edition omits the mention of any viewing location - still clearly referring to the same thing, though.
          $endgroup$
          – dplmmr
          3 hours ago












          $begingroup$
          welcome. I deal with European models mostly and cloud cover is the term used.
          $endgroup$
          – gansub
          3 hours ago




          $begingroup$
          welcome. I deal with European models mostly and cloud cover is the term used.
          $endgroup$
          – gansub
          3 hours ago

















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