The glacial flood in Grímsvötn has started slowly but the main force of glacial runoff is expected to flow down Gígjukvísl river, RÚV reports. The Icelandic Met Office had previously reported that is was expected to occur underneath Vatnajökull glacier. Water is draining from Grímsvötn subglacial lake, which is underneath the glacier.
The water levels in the rivers have risen by 15 centimetres, but conductivity in the river has increased little to none. Increased conductivity in rivers is normally connected to a glacial flood. The area has experienced glacial floods multiple times in recent years.
The Icelandic Met Office's website states that hydrogen sulfide levels in the area are high around the source of Gígjukvísl river. Travellers are advised to stay away from the area. It is expected, however, that the glacial flood will be quite small and that danger levels are not high.