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Debris avalanches, debris flows and slushflows warning yellow level for mountainous areas in Southern Norway.

2

Yellow level

Published: Valid: from 21.06.2020 07:00 to 22.06.2020 06:59
Next forecast before:
  • Danger ongoing: Sunday afternoon 21. Jun. 2020
  • Danger decrease: Monday afternoon 22. Jun. 2020
  • Height: 0 - 2400 moh

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Consequence

Some landslides are expected. A few large events may occur. Exposed railways and roads may be closed. Debris avalanches/shallow slides: Soil slides and rapid movement of saturated soil in steep terrain. Debris flows: A "flood" of water, soil and rocks in steep creeks. Surface runoff in steep terrain can cause streams to change regular flow patterns. Slushflows: A flow of water saturated snow. These slides can start in relatively flat terrain and seek towards streams and steep slopes. Along the watercourses in the flood areas: High discharge can lead to excavation of masses at the foot of slopes. Rapid lowering of water levels after flood can also cause local landslides.

Advice

Keep yourself updated about the development of the weather, the landslide and flood situation, and follow the weather radar. Keep away from steep slopes, as well as streams and rivers with high discharge. Keep water paths and culverts free of snow, ice, gravel, waste, twigs and leaves. Clogged waterways with dammed water may cause landslides. River erosion may trigger minor soil slips, which again may reduce the soil stability along the river.

Description

The soil is water-saturated. Steep slopes, as well as streams and river with high discharge, are particularly exposed. Risk of slushflows is especially high in areas with more than 50 cm snow. The snow is fully water-saturated. Slushflows are triggered even in relatively gentle slopes, where water accumulates. Slushflows follow terrain depressions, and may develop into debris flows. Debris flows may reach the valley bottom even if they are triggered high in the terrain.