Drammen, southwest of Oslo along the river of the same name, receives around 850 mm (about 33 inches) of rain a year, more than the capital thanks to its slightly more exposed position relative to weather systems moving up from the coast. The Drammenselva river has a documented history of flooding during periods of heavy rain combined with snowmelt further upstream, a seasonal risk the city has invested in managing through updated flood defenses. Summer convective showers add a separate, more localized hazard. Because the combination of river flow and direct rainfall both matter here, radar is most useful for tracking the faster-moving, more immediate rain risk. Norway’s Meteorological Institute operates the national radar network.
Learn more: How Does Rain Radar Work? · Open the full Rain Map