Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/nhess-2017-426
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
19 Dec 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).
The Norwegian forecasting and warning service for rainfall- and snowmelt-induced landslides
Ingeborg K. Krøgli1, Graziella Devoli1,2, Hervé Colleuille1, Monica Sund1, Søren Boje1, and Inger Karin Engen1 1Section for forecast of flood and landslide hazards, Department of Hydrology, Norwegian Water Resources and Energy Directorate (NVE), Oslo, 0368, Norway
2Department of Geosciences, University of Oslo, Oslo, 0316, Norway
Abstract. The Norwegian Water Resources and Energy Directorate (NVE) has run a national flood forecasting and warning service since 1989. Back in 2009, the directorate was given the responsibility of initiating also a national forecasting service for rainfall-induced landslides. Both services are part of a political effort to improve flood and landslide risk prevention. The Landslide Forecasting and Warning Service was officially launched in 2013 and is developed as a joint initiative across public agencies between NVE, the Norwegian Meteorological Institute (MET), the Norwegian Public Road Administration (NPRA) and the Norwegian Rail Administration (Bane NOR). The main goal of the service is to reduce economic and human losses caused by landslides. The service performs a national landslide hazard assessment every day describing the expected awareness level at a regional level (i.e. for a county and/or group of municipalities). The service is operative seven days a week throughout the year. Assessments and updates are published at the warning portal http://www.varsom.no at least twice a day, for the three coming days. The service delivers continuous updates on the current situation and future development to national and regional stakeholders and to the general public. The service is running in close cooperation with the flood forecasting service. Both services are based on the five pillars: automatic hydrological and meteorological stations, landslide and flood historical database, hydro-meteorological forecasting models, thresholds or return periods, and a trained group of forecasters. The main components of the service are herein described. A recent evaluation, conducted on the four years of operation, shows a rate of over 95 % correct daily assessments. In addition positive feedbacks have been received from users through a questionnaire. The capability of the service to forecast landslides by following the hydro-meteorological conditions is illustrated by an example from autumn 2017. The case shows how the landslide service has developed into a well-functioning system providing useful information, effectively, on-time.

Citation: Krøgli, I. K., Devoli, G., Colleuille, H., Sund, M., Boje, S., and Engen, I. K.: The Norwegian forecasting and warning service for rainfall- and snowmelt-induced landslides, Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2017-426, in review, 2017.
Ingeborg K. Krøgli et al.
Ingeborg K. Krøgli et al.
Ingeborg K. Krøgli et al.

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