River valley fog in southwestern Wisconsin

August 23rd, 2013 |
Suomi NPP VIIRS "Fog/stratus product" and Day/Night Band images

Suomi NPP VIIRS “Fog/stratus product” and Day/Night Band images

A comparison of AWIPS images of Suomi NPP VIIRS IR brightness temperature difference (BTD) “Fog/stratus product” and 0.7 um Day/Night Band images (above) revealed the formation of nocturnal river valley fog across parts of southwestern Wisconsin and the adjacent Upper Mississippi River Valley region at 08:00 UTC or 3:00 AM local time on 23 August 2013. Overlays of METAR surface reports and cloud ceiling/surface visibility indicated that the fog was restricting visibilities to 1/4 mile at a few locations.

A comparison of the 375-meter resolution (projected onto a 1-km AWIPS grid) VIIRS BTD “Fog/stratus product” image with the corresponding 4-km resolution GOES-13 BTD Fog/stratus product (below) demonstrated the advantage of better spatial resolution for detecting these fine-scale river valley fog features.

Suomi NPP VIIRS and GOES-13 IR brightness temperature difference "Fog/stratus product" images

Suomi NPP VIIRS and GOES-13 IR brightness temperature difference “Fog/stratus product” images

One Response to “River valley fog in southwestern Wisconsin”

  1. wow !!! no doubt that today’s satellites can accomplish amazing things and the best that this technology is available to everyone with internet

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