Common space types such as classrooms and offices have workplane illumination requirements that range from 200-500 lux (20-50 footcandles). Integrated Design Lab Puget Sound [2], Overcast, written as "OVC" in the METAR observation, is reported when the cloud cover is observed to equal eight oktas (eighths). Download the perfect overcast sky pictures. The same weather, when observed from above, might be referred to as (an) undercast. [1] However, the total cloud cover must not be entirely due to obscuring phenomena near the surface, such as fog. On an overcast day in North America, outdoor illumination values can range from 1,000-30,000 lux (100-3,000 footcandles) depending on time of day, time of year, and location. New Buildings Institute Electric lighting criteria are almost exclusively defined in terms of illuminance. Overcast or overcast weather, as defined by the World Meteorological Organization, is the meteorological condition of clouds obscuring at least 95% of the sky. Sometimes clouds can be different colors such as black or white, but overcast usually refers to darker skies. These graphs are shown with 300 lux highlighted using a red dashed line. Not surprisingly, the same spaces perform very differently under overcast skies compared to sunny skies. These graphs represent raw illumination data measured at the horizontal workplane. Find overcast sky stock images in HD and millions of other royalty-free stock photos, illustrations and vectors in the Shutterstock collection. Illumination is the most common measure of light and is defined in lay terms as the amount of light falling on a surface. [4] In some cases, it can be impossible to see distinct borders of clouds or the sky may be covered by a single type of cloud, such as stratus and the whole sky will be a dull white. Thousands of new, high … Integrated Design Lab Boise Periods of overcast weather can range from a few hours to several days.    |    Overcast or overcast weather, as defined by the World Meteorological Organization, is the meteorological condition of clouds obscuring at least 95% of the sky. [1][3] An overcast sky may be explicitly identified as thin (mostly transparent), but otherwise is considered opaque, which always constitutes a ceiling in aviation meteorology.[2]. Login, Pattern 7: Blinds and Shades (South Sun Penetration), Pattern 8: Blinds and Shades (Blind Types), Pattern 12: Atrium and Adjacent Floorplate (Atrium Fenestration), Pattern 13: Atrium and Adjacent Floorplate (Atrium Size), Pattern 14: Daylight from Top and Side (Small Building), Pattern 15: Daylight from Top and Side (Office Building), Pattern 16: Daylight from Top and Side (Classroom), Pattern 17: Space Programming for Daylight, Sunlight and Variability, Pattern 18: Fixed Building Shading (Fixed Classroom Shading), Pattern 19: Fixed Building Shading (Building Orientation). How Meteorologists Define Overcast Skies Illumination is the most common measure of light and is defined in lay terms as the amount of light falling on a surface. Copyright 2020.    |    This makes the sky look dull and gray and it doesn't necessarily mean that precipitation will fall, though the chances for rain or snow do increase on overcast days. However, the total cloud cover must not be entirely due to obscuring phenomena near the surface, such as fog. Overcast weather can also affect people suffering from seasonal affective disorder. Free for commercial use No attribution required Copyright-free All rights reserved. Electric lighting criteria are almost exclusively defined in terms of illuminance.    |    On an overcast day in North America, outdoor illumination values can range from 1,000-30,000 lux (100-3,000 footcandles) depending on time of day, time of year, and location. Overcast sky conditions occur when clouds cover all or most of the sky and cause low visibility conditions. [5], CS1 maint: BOT: original-url status unknown (, http://www.oed.com/view/Entry/134377#eid32922408, https://en.wikipedia.org/w/index.php?title=Overcast&oldid=967493135, CS1 maint: BOT: original-url status unknown, Creative Commons Attribution-ShareAlike License, This page was last edited on 13 July 2020, at 15:26. Find over 100+ of the best free overcast sky images.

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