False Color RGB shows recent snow in AL and southern/central Appalachians…

Just a quick note about the recent snowfall in central/northern Alabama and the southern and central Appalachian region.  Although significant melting of the snow has occurred here in AL with above freezing temperatures today, Terra MODIS images show the lingering snow (red colors) especially in parts of Morgan, Cullman, Marshall, Blount and Jefferson Counties in Alabama (Figure 1).  Around 3 to as much as 4 inches of snow were reported in some of these areas yesterday.

Figure 1.  Terra MODIS False Color RGB valid 1717Z 18 Oct 2013.

Figure 1. Terra MODIS False Color RGB valid 1717Z 18 Jan 2013.

 

Of course, snow will also show up fairly well in standard visible imagery.  However, notice the snow (red color) over portions of the Appalachians coincident with some low/mid level cloud cover (white colors) forced by uplift along the higher terrain (Figure 2).  The snow extends from Knoxville, TN northeast into central Virginia.  The snow is much easier to differentiate from cloud cover in this type of imagery.  Widespread snow with amounts ranging from just around an inch in some of the valley locations up to around one foot were reported in the region.

Figure 2.  Terra MODIS False Color RGB valid 1540Z 18 Jan 2013.

Figure 2. Spliced images: Terra MODIS False Color RGB valid 1540Z 18 Jan 2013 (east), Terra MODIS False Color RGB valid 1717Z 18 Jan 2013.   

 

 

One thought on “False Color RGB shows recent snow in AL and southern/central Appalachians…

  1. Nice MODIS examples demonstrating the utility of RGB imagery for the discrimination of snow cover vs cloud features. A few hours later, after some additional snow melt, a comparison of AWIPS images of Suomi NPP VIIRS visible channel and RGB product at 18:51 UTC showed that many of the cloud features continued to persist in portions of the Appalachians: http://cimss.ssec.wisc.edu/goes/blog/wp-content/uploads/2013/01/130118_suomi_npp_viirs_vis_rgb_anim.gif

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