Spatial and Temporal Variability of Extraordinary Precipitations in Spain (1916-2022)
DOI:
https://doi.org/10.18172/cig.6634Keywords:
Precipitation, extreme events, Spain Weather TypeAbstract
The use of AEMET's documentary archives and the Annual Summary Books has allowed us to create a catalog of extraordinary rainfall events in mainland Spain from 1916 to 2022. During this period, at least 19,184 daily observations of monthly maximum rainfall exceeding 100 mm were recorded, from 4,325 observatories, spread across 4,814 days. Records with more than 200 mm/day amounted to 1,130, spread over 530 days and 664 observatories. The spatial distribution shows that these events can occur anywhere, but there is a clear concentration of both records and dates along the coasts, particularly on the Mediterranean coast for rainfall over 200 mm. In general, extraordinary rainfalls are more frequent in autumn, while summer months have the fewest records and daily events. These events are strongly linked to specific weather patterns. Analyzing them by Hydrological Divisions allows us to differentiate areas influenced by Atlantic advections from those affected by Mediterranean advections. The Ebro Division, due to its size and location, experiences various influences. The region’s topography seems to play a role in determining the spatial extent of extraordinary rainfall events. Overall, the frequency of these events shows no clear trend over time.
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