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Copernicus Sentinel-1 catches Norwegian spring floods - in autumn

31 October 2018

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Spring floods occur when snow melts over large areas in short time periods, often combined with rain—so-called rain-on-snow events that add water, further intensifying snow melt. As their name suggests, such floods typically occur in spring – except for a few weeks ago, when Southern Norway was struck with this phenomenon.

During the weekend of 13 October 2018, snow had already fallen over large mountain areas in Southern Norway. An exceptional warm spell from the south hit Norway and melted away most of the mountain snow within a few days. In the village of Tafjord, for instance, the temperatures rose from 11 °C to over 25 °C within one hour. The runoff from this sudden and massive snow melt caused strong floods and associated severe damage in the surrounding valleys.

Source: Sentinel Online

Image credit: Contains modified Copernicus Sentinel data (2018)/processed by the Department of Geosciences, University of Oslo - A combination of repeated Copernicus Sentinel-1 radar images shows flooded areas at the village of Lom (lower left) in red. Lom is known as the "entrance door" to the Jontunheimen mountains.

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