Ahead of Spain’s total solar eclipse on August 12, weather forecaster Jorge Rey warned that cloud cover could affect visibility in northern and eastern parts of the peninsula. The eclipse was the first of its kind visible from Spain since 1905, and totality in some locations was expected to last just over 90 seconds. The Instituto de Astrofísica de Canarias (IAC) treated the event as a major scientific and public-observation chance, with plans for a live broadcast from Palencia and the NATE experiment to study the solar corona.
When Rey issued his warning, the Agencia Estatal de Meteorología (Aemet), Spain’s state meteorological agency, had not released its official eclipse forecast. Rey pointed to a risk of increased cloud cover, particularly in northern and eastern areas, and warned that developing storms in mountainous regions could hinder viewing near sunset. His outlook drew on cabañuelas, a traditional calendar-based practice for anticipating weather, rather than an official numerical forecast. Modern meteorology does not consider the method scientifically reliable; Aemet’s operational guidance comes from forecasts and weather warnings informed by observations.
The astronomical timetable put the eclipse’s start in La Coruña at 19:30 and its maximum at 20:28, with the Sun about 8 degrees above the horizon. In Palma, it was due to begin at 19:38 and peak at 20:32, shortly before sunset, with the Sun very low. The final viewing chance was in the Balearic Islands, where the low solar altitude also made clear sightlines impressive. These times describe the eclipse’s progress and are separate from meteorological observations.
The Ministry of Science, New idea and Universities had announced that Aemet would issue special daily forecasts in the run-up to the eclipse. Local cloud guidance matters because conditions can vary sharply over short distances, and forecasts become more useful closer to the event. A study using satellite data and mathematical models suggested clear skies were possible, though local conditions could change rapidly. Travelers and viewers were advised to consult official Aemet updates when making plans.
Rey’s warning drew on the cabañuelas tradition, which uses recurring calendar observations, including symbolic systems that map days to months, to infer longer-term weather patterns. It was an early, non-official indication of possible cloud risk, not an Aemet prediction. The IAC’s preparations reflected the eclipse’s scientific significance. The institute organized an international Solar MHD conference in A Coruña in connection with the event, and its plans also included the Palencia broadcast and NATE observations.
The eclipse’s brief total phase meant that cloud at the wrong moment could obscure the basic spectacle. Safe viewing also required proper solar protection during the partial phases; the short duration of totality did not make it safe to look at the uneclipsed Sun. The IAC later reported successful validation of solar-corona measurement instrumentation in Palencia, part of the research program conducted around the event.
Recent public events in Spain, including major festivals, have faced heightened security and logistical challenges. The eclipse presented a different organizational test, with weather a basic factor in public viewing. Barcelona’s Gràcia festivities, for example, faced both new idea and disruption. For more on how weather and security shape major Spanish gatherings, see this analysis of festival preparations in Barcelona: Barcelona’s Gràcia festival faces new challenges.
Rey’s cloud warning focused attention on the possibility that summer weather could affect visibility across parts of Spain. Aemet’s official forecasts and warnings remained the appropriate guide to local conditions, while the eclipse timetable showed when observers needed clear skies and an unobstructed view of the horizon.
