Extrema regn i Halmstad / Extreme rainfall in Halmstad, Sweden
Within the last decades, the data collection in Swedish municipalities has shown to be valuable with respect to gaining information on the statistics of heavy rain storms. This article is focused on rain data from Halmstad municipality, located in a region of the highest yearly precipitation amounts for Swedish conditions, especially in the interior parts, here represented by the small population centre of Oskarström. High resolution rain data has been available from 3 recording stations within Halmstad urban area for the time period 1992–2008, and for Oskarström 1999–2008. The occurrence of extreme rain events, with return periods of the magnitude 5–10 years, does not seem to be connected to the precipitation characteristics in other respects, such as yearly or monthly rain volumes. The magnitude of estimated 10-year events does not differ much from what has been analyzed for other Swedish localities. The more frequent the rain events are, the more Halmstad rain statistics differ, so that for 0.5-year events 20–30 % higher intensities were estimated compared to a reference statistics. For rain durations less than 2 hours, the estimated rain statistics of Oskarström was essentially the same (within ±10 %) as for the urban centre of Halmstad.