Space

Autumn Mornings Bring Valley Fog

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Briefings

NASA Earth Observatory documented valley fog forming over the Appalachian Plateau and Cumberland River region on November 8, 2026, visible in MODIS and VIIRS satellite imagery. The phenomenon occurred as temperatures dropped into the 30s Fahrenheit, causing ground cooling and condensation. Dense fog blanketed the area earlier that week, prompting travel advisories, while the morning fog cleared by afternoon. The study highlights the seasonal pattern of valley fog formation driven by cold air pooling in low-lying terrain.

Key points

• Valley fog formed over the Appalachian Plateau and Cumberland River region on November 8, 2026, visible in MODIS and VIIRS satellite imagery.
• Temperatures dipped into the 30s Fahrenheit on the morning of November 8, 2026, causing ground cooling and condensation that created the fog.

Context

This finding illustrates seasonal valley fog patterns in eastern Kentucky and southwestern West Virginia, where cold air pools in valleys during autumn. The event occurred during a period of dense fog earlier in the week that prompted travel advisories, providing real-world context for the atmospheric phenomenon documented by NASA Earth Observatory.

Limitations

Satellite imagery is limited to November 8, 2026, and may not capture all fog occurrences. The study relies on MODIS and VIIRS data with specific attribution to Lauren Dauphin, and some regional weather details are sourced from National Weather Service and National Park Service records.

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