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Story summary
- La Calima, an annual desert dust plume, will affect Spain, Portugal, and France with grit-laden rainfall.
- The plume forms from Sahara winds and causes 'blood rain'—red mud mixed with precipitation.
- Its intensity is linked to the DANA weather pattern and can trigger severe weather with La Calima.
- Public health officials urge vulnerable groups to limit outdoor activities due to hazardous air conditions that may persist for several days.
