VIIRS RGB and Day-Night Band to Differentiate Cloud Properties at Night

From the post on October 9, the VIIRS Day-Night Band (DNB, from the low light sensor) demonstrated the value of a “visible” type of image at night to see the cloud cover extent better than some IR channels during cool season situations.  Further, a post on October 10 highlighted how the VIIRS DNB shows light sources from cities and how this light can be scattered or blocked by overlying clouds.  Below is an example of the DNB with the city lights and cloud cover easily seen.  To complement this night-time image and RGB product is available that helps identify the types of clouds present in the scene by using multiple channels and channel differences.  The Night-time Microphysics RGB (via VIIRS channels and EUMETSAT recipe) differentiates cloud features.  Low clouds in the southern half of the U.S. tend to be a bright aqua , as seen over Texas, Louisiana and surrounding areas.  Further north the low clouds take on a more yellow tone due to low temperatures and less blue color contribution.  Higher clouds are red and purple shades, depending on their thickness.  A quick guide on the Night-time Microphysics RGB is located on SPoRT’s website for download (http://weather.msfc.nasa.gov/sport/training/) .  SPoRT is providing this product to a variety of users and display systems and has a webpage to view both the DNB and RGB at full resolution over the Southeast U.S. (http://weather.msfc.nasa.gov/cgi-bin/sportPublishData.pl?dataset=foglowclouds)

VIIRS Day-Night Band channel on October 6, 2012 at 0818 UTC

VIIRS Night-time Microphysics RGB Imagery from October 6, 2012 at 08018 UTC. Red component: 12-10.8 micron (M16-M15), Green component:10.8-3.9 micron (M15-I4), Blue component: 10.8 micron (M15)

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