'Blood Rain' Warning for Spain as Saharan Dust Tongue Sweeps Across Andalusia and Costa Blanca

The Calima Is Back — and This One Comes With Rain

Homeowners and drivers across Spain are being warned to prepare for a major episode of "blood rain" — the orange, muddy downpours caused when Saharan dust mixes with rainfall — as a vast tongue of African sand sweeps across the peninsula and the Balearic Islands.

The dust cloud, driven by strong southerly winds, has been pushing suspended sand from the Sahara northward since Monday. The real problem comes when this calima (dust haze) collides with an incoming Atlantic weather front — the combination producing lluvias de barro (muddy rain) that coats everything left outside with a thick orange residue.

When and Where

The episode is unfolding in stages:

• Tuesday April 28: Hazy conditions spreading across Andalusia, the eastern coast, central regions and the Balearic Islands — initial scattered muddy showers possible
• Wednesday April 29 (peak): Heavy dust concentrations combined with widespread rain — the worst conditions of the episode, affecting Andalusia, Extremadura, Madrid and Castilla-La Mancha most severely
• Thursday onwards: Gradual clearance expected across most regions
• Weekend: Some forecasts suggest a possible return to Mediterranean coastal areas

Spain's extreme north is expected to largely escape the worst, as are some isolated parts of the Mediterranean coast.

Health Warning: Take It Seriously

The calima is not merely an inconvenience — it poses genuine respiratory health risks, particularly for older residents and those with pre-existing conditions. The dust carries PM10 particles that can cause severe breathing difficulties.

If you have asthma, breathing difficulties or a heart condition, meteorological experts at Meteored advise:

• Keep windows closed during the peak of the episode
• Avoid heavy outdoor exercise while dust concentrations are high
• Wear a face mask if you need to go outside and skies are turning deep orange

Protecting Your Home, Car and Terrace

The muddy rain leaves a stubborn orange film on any surface left exposed. A few practical steps before the peak on Wednesday:

• Move cars under cover if possible — or accept that a wash will be needed afterward
• Cover outdoor furniture and barbecues — the residue stains porous surfaces
• Bring in cushions, parasols and outdoor rugs
• Check pool filters — the dust load can overwhelm standard filtration during heavy calima events

Why It Happens

Spain's geographic position makes it particularly exposed to Saharan dust events. When pressure systems align to drive southerly winds across the Strait of Gibraltar and up the peninsula, vast quantities of fine sand are lifted into the upper atmosphere and carried northward. When these dust-laden air masses then encounter Atlantic rain fronts moving in from the west, the water droplets pick up the suspended particles on the way down — arriving at ground level as the distinctive muddy orange rain that expats and long-term residents know well.

Episodes of this intensity are not uncommon in spring and autumn, when the atmospheric conditions for large-scale dust transport are most frequently met.

This article is based on reporting from The Olive Press, published April 28, 2026, drawing on meteorological analysis by Meteored.