NASA Satellite Images Show Morning Fog Clearing Over the Appalachian Plateau
NASA Earth Observatory released satellite imagery on November 10, 2026, showing autumn valley fog forming and dissipating across parts of the United States. Instruments on NASA's Terra satellite and NOAA-21 captured images on November 8, 2026, over the Appalachian Plateau and the Cumberland River region. The morning imagery shows white fog filling branching river valleys across eastern Kentucky, southwestern West Virginia, Tennessee, and south-central Kentucky. By the afternoon, warmer temperatures burned off the fog, revealing clear skies, rivers, and lakes underneath. For residents and travelers in the region, autumn fog is a regular morning event driven by cooling temperatures. On the morning the images were taken, temperatures dropped into the 30s Fahrenheit. Earlier that week, dense fog caused hazardous travel conditions across a broader portion of the region. NASA explained that cold air is denser than warm air, causing it to pool in low-lying river valleys where extra moisture speeds up fog formation.
What was announced
NASA Earth Observatory published satellite images showing low clouds tracing river valleys on November 8, 2026. The imagery covers the Appalachian Plateau and the Cumberland River, including parts of Kentucky, West Virginia, and Tennessee.
The Moderate Resolution Imaging Spectroradiometer instrument on NASA's Terra satellite captured a morning natural-color image. It shows white fog nestled inside branching valleys surrounded by brown and green terrain. Later that afternoon, the Visible Infrared Imaging Radiometer Suite on the NOAA-21 satellite recorded a false-color view. By that time, the fog had burned off, showing dark blue rivers and lakes flowing through bright green plant life.
What it means
The images illustrate how autumn weather patterns generate fog in mountainous terrain. As nights grow longer in the fall, the ground loses heat gained during the day. The air just above the ground cools down to the dew point, which is the temperature where air saturates and water vapor condenses into tiny water droplets.
Because cold air weighs more than warm air, it slides downhill into valleys. Rivers and streams running through these low areas supply extra moisture, making fog even more likely to form. National Weather Service data shows local temperatures fell into the 30s Fahrenheit on the morning of November 8. Forecasters noted dense local fog that morning, following broader fog advisories that led to hazardous travel conditions earlier in the week.
What the announcement does not tell us
The announcement does not state how many flight delays or traffic accidents resulted from the hazardous travel conditions mentioned earlier in the week. It also does not explain whether specific highway routes were shut down due to low visibility. Additionally, the report does not detail long-term trends in fog frequency for the region or compare this season's fog density to historical averages.
How this was written
This analysis was written with AI from the official announcement below, using only facts that announcement states. The quoted wording is NASA News Releases’s own. Always check the original before acting on anything here.
Low clouds trace the branching valleys of the Appalachian Plateau and the Cumberland River, then burn off by afternoon.
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