Valley fog and mountain snow mark autumn in Norway and Sweden

As temperatures drop and nights grow longer in autumn, fog and snow become more common across much of Scandinavia. Fog frequently develops in valleys and low-lying areas when moist air cools near the ground, while snow begins to settle on the higher grounds of Norway and Sweden.

This image, acquired by one of the Copernicus Sentinel-3 satellites on 20 October 2026, shows the contrast between fog-filled lowlands and snow-covered uplands across the Scandinavian Peninsula. Patches of fog and low clouds lie in the valleys of eastern Norway and western Sweden, particularly north of Oslo. Snow is visible at higher elevations in southern Norway, while extensive cloud formations stretch across the Norwegian Sea and the North Sea.

Copernicus Sentinel-3 data support the monitoring of fog, low cloud, snow extent, and large-scale atmospheric conditions across northern Europe, contributing to weather forecasting, transport safety, and water management in the region.