GOES Fog Depth Product depicts patchy fog in East Tennessee

East Tennessee has a large number of rivers and lakes, which often aids in the development of localized, patchy fog.

WFO Morristown writes a TAF for the Tri-Cities Regional Airport (TRI). This airport happens to be located very close to Boone Lake, making it very susceptible to fog and low clouds.

Map of Tri-Cities Regional Airport (TRI) and its proximity to Boone Lake.

NASA SPoRT’s GOES Fog Depth Product has been used at WFO MRX to better determine the coverage of fog across East Tennessee. On the morning of March 25, 2009, patchy fog developed mainly near bodies of water in the MRX CWA. The GOES Fog Depth Product accurately captured the localized fog, particularly near TRI and near the Knoxville McGee-Tyson Airport (TYS).

The GOES Fog Depth Product depicts patchy fog across East Tennessee, particularly near bodies of water and at the TAF sites of TRI and TYS. The visibility at TRI was 1/4 mile with a vertical visibility of 100 feet. At TYS, the visibility was 2 miles with overcast clouds at 600 feet.

The pattern of fog depicted in the image also shows the locations of bodies of water – Boone Lake, Norris Lake, Cherokee Lake, Fort Loudon Lake, and Douglas Lake.

Compared to the 11-3.9 micron image below, which is typically used to distinguish fog, the GOES Fog Depth Product did a much better job of depicting the locations of fog.

The 11-3.9 micron image did not depict the patchy fog across East Tennessee as well as the GOES Fog Depth Product.

Using the GOES Fog Depth Product has helped forecasters at WFO MRX to better determine the coverage of fog across East Tennessee, and has occasionally led to improved aviation forecasts.

2 thoughts on “GOES Fog Depth Product depicts patchy fog in East Tennessee

  1. Nice post! Keep this feedback coming. We all learn a lot from it! It is interesting that the GOES Fog Product did better than the 11-3.9 micrometers difference imagery. It world have been informative to see if the MODIS 11-3.9 micrometer channel would have detected the fog better than GOES? MODIS has better resolution and precision than GOES. The MODIS difference imagery is one of the SPoRT products. Check this out next time.

  2. Sometimes the Fog Depth doesn’t come in and 11-3.9 um is all we have. It can still be a helpful product in such cases.

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