Southeastern Fires Observed in VIIRS Imagery…

A number of fires have erupted in recent weeks due in part to the drought gripping parts of the Southeast U.S.  Especially hard hit are areas in and around the southern Appalachians, extending into central portions of Alabama and Georgia, where D3 (Extreme) to D4 (Exceptional) drought conditions exist, per the latest U.S. Drought Monitor (Image 1).


Image 1. U.S. Drought Monitor for 8 November 2016. Notice the large area of D3-D4 drought gripping parts of the Southeast.

Recently, the fires and some smoke were captured well in Shortwave IR (Image 2) and Day-Night Band imagery (Image 3) produced by the VIIRS instrument onboard the Suomi NPP satellite.


Image 2. Fires appear as small black dots in the Shortwave IR (~3.7 um) imagery taken at 0734 UTC 15 Nov 2016.



Image 3. In this Day-Night Band Radiance RGB, the fires (center of white circles) appear similar to city lights, however smoke plumes are evident with some of the stronger and heavier smoke-producing fires (red ovals), 0734 UTC 15 Nov 2016

Since boundary layer winds tend to shift direction at night with the loss of deep mixing, the Day-Night Band image can be used by forecasters to detect how smoke plumes change direction at night and may help with forecasts of smoke impacts.

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