A relatively high water level in a glacier lagoon by Langjökull glacier, West Iceland, suggests that a flood can be expected from the lagoon in the near future. Such floods have occurred before and are known to cause a very rapid water level rise in the rivers Svartá and Hvítá in the Borgarfjörður area.
The Volcanology and Natural Hazard Group and the University of Iceland published satellite images of the lagoon and surrounding area yesterday, showing a high water level in the lagoon. At least three floods have occurred from the lagoon before in the last few years; in August 2020, August 2017, and September 2014.
Typically, the floodwater runs under the glacier toward the southwest, where it runs into Svartá and then from that river into Hvítá. The Icelandic Met Office is monitoring the situation, in part with water level measuring equipment in Hvítá, which will be able to detect the peak of the flood.
The flooding could be dangerous to those travelling on or near the two rivers.