September 27, 2012 Marine Layer Clouds off the California Coast
September 27, 2012 Marine Layer Clouds off the California Coast
acquired September 27, 2012 download large image (3 MB, JPEG, 4000x4000 - left)
acquired September 27, 2012 download GeoTIFF file (9 MB, TIFF)
acquired September 27, 2012 download large thermal IR image (2 MB, JPEG, 4000x4000 - right)
acquired September 27, 2012 download GeoTIFF file (9 MB, TIFF)
acquired September 27, 2012 download Google Earth file (KML)
Marine Layer Clouds off the California Coast
acquired September 27, 2012 download large image (3 MB, JPEG, 4000x4000)
acquired September 27, 2012 download GeoTIFF file (9 MB, TIFF)
Marine Layer Clouds off the California Coast
thermal IR
acquired September 27, 2012 download large thermal IR image (2 MB, JPEG, 4000x4000)
acquired September 27, 2012 download GeoTIFF file (9 MB, TIFF)
acquired September 27, 2012 download Google Earth file (KML)

On September 27, 2012, the Visible Infrared Imaging Radiometer Suite (VIIRS) on the Suomi NPP satellite captured this nighttime view of low-lying marine layer clouds along the coast of California.

The image was captured by the VIIRS “day-night band,” which detects light in a range of wavelengths from green to near-infrared and uses filtering techniques to observe signals such as gas flares, auroras, wildfires, city lights, and reflected moonlight.

An irregularly-shaped patch of high clouds hovered off the coast of California, and moonlight caused the high clouds to cast distinct shadows on the marine layer clouds below. VIIRS acquired the image when the Moon was in its waxing gibbous phase, meaning it was more than half-lit, but less than full.

Low clouds pose serious hazards for air and ship traffic, but satellites have had difficulty detecting them in the past. To illustrate this, the second image shows the same scene in thermal infrared, the band that meteorologists generally use to monitor clouds at night. Only high clouds are visible; the low clouds do not show up at all because they are roughly the same temperature as the ground.

Learn more about the VIIRS day-night band and nighttime imaging of Earth in our new feature story: Out of the Blue and Into the Black.

Marine Layer Clouds off the California Coast

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