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.
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 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.
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.