Observed changes in heavy daily precipitation over the Nordic-Baltic region

The Nordic-Baltic region has experienced numerous flooding episodes resulting from heavy rainfall. Such events are costly and may potentially threaten the safety of population. In this paper we present a temporally long spatially dense dataset annual maximum daily precipitation their date occurrence measured in large covering Fennoscandia Baltics (Dyrrdal et al., 2021, doi:10.11582/2021.00015). We analyse long-term (1901–2020) changes at 138 stations short-term (1969–2020) 724 for both maxima occurrence. Further, assess climatology including record evens, as well design values. Results show majority positive trends 5-year return level, with hotspots southeast Norway, southern Sweden southwest Finland. Generally, occur somewhat later year now compared to beginning last century. level is relatively homogeneous across region, values between 30 50 mm, except few lower Finland high mainly exceeding 70 mm west coast Norway. • Dataset 1-day (AM1d) region. Increased intensity AM1d during years many stations. generally 1900. Decadal cyclic development. homogeneous, higher West-Norway.