Complex topography of southwestern Norway is often receiving high rainfall amounts given its position relative to storm systems that travel across western Europe towards Scandinavia. As such, strong SW-erlies are usually present ahead of such system, creating favourable environment for excessive non-convective or even convective rainfall towards the SW Norway.

Yesterday, October 23rd, such a system was travelling across the UK and resulted in continuous mostly orographic rainfall from North Sea onshore to SW Norway. A SLGT risk of DAY 1 Outlook for 22/10/2013 has been assigned as high rainfall amounts have been expected. Some weather stations reported more than 100mm of accumulated rain during the last 24 hours (between 22/10/2013 06 UTC and 23/10/2013 06 UTC).

Map overview of 24h rainfall accumulations across SW Norway. Source: OGIMET