Spain is bracing for a period of significant weather instability as a cold air mass from the northeast interacts with an Atlantic low-pressure system.

The Agencia Estatal de Meteorología (AEMET) has issued weather warnings across several regions, with the most severe alerts in Castellón and Tarragona, where heavy rain and thunderstorms are expected.

This weather pattern, characterized by a 'vaguada' or trough, is bringing unpredictable and potentially severe conditions, including hail, to the Mediterranean area and is expected to spread across much of the peninsula and the Balearic Islands.

The instability is anticipated to peak mid-week, affecting the eastern and northern parts of the country, with a gradual easing expected by Sunday.

Residents are advised to stay updated with the latest forecasts as the situation remains highly uncertain.