Spain is facing another week of heightened weather risk as a new Atlantic system approaches the Iberian Peninsula. While many regions are still dealing with the aftermath of Storms Leonardo and Marta, a fresh disturbance is moving in, accompanied by a well-defined atmospheric river set to funnel large amounts of moisture towards the country.
Spain Press Editorial Team
Storm Nils is expected to bring renewed rainfall from Tuesday onwards. The situation is particularly concerning because soils across large parts of Spain are already heavily saturated. After weeks of persistent rain, the ground’s ability to absorb further precipitation is severely limited.
According to meteorologists, the main concern is not short bursts of extreme rainfall, but the duration of the episode. The atmospheric river will act as a continuous conveyor belt of humid air from the Atlantic, feeding rain systems over already stressed river basins for many hours at a time.
This significantly increases the risk of surface runoff, rapid rises in river levels and localised flooding, even if rainfall intensity remains moderate at times.
The most critical period is expected between Tuesday and Wednesday. During this window, rain will spread across much of the country, with western, central and southern regions particularly exposed. In mountainous areas, orographic effects could further intensify rainfall totals.
On Tuesday, precipitation is forecast to become more widespread and intensify during the afternoon and evening. By Wednesday, the atmospheric river is expected to remain firmly in place, sustaining a scenario of persistent, locally heavy rain across many parts of Spain.
The hydrological situation is already strained in numerous river basins, where water levels remain elevated following recent storms. Many catchment areas are considered highly vulnerable, increasing the likelihood of rapid flooding and overflows.
Meteorologists stress that the greatest danger lies not in isolated heavy downpours, but in prolonged rainfall over several days. Continuous rain falling on already waterlogged ground substantially raises the risk of damage in flood-prone areas, along transport routes, in agricultural zones and in settlements close to rivers.
With reservoirs already full, river flows running high and forecasts remaining unfavourable, Spain is entering a phase of heightened meteorological vigilance. The coming days will be crucial in assessing impacts and responding swiftly to emerging risks.
