Extreme heat: Portugal on red alert until Sunday

Extreme Heat: Portugal on Red Alert Until Sunday

Extreme heat - The Portuguese Institute for Sea and Atmosphere (IPMA) has issued a red alert for heat, affecting 12 of the 18 mainland districts. This severe warning, the highest level on the weather risk scale, signals an "extreme weather risk situation" due to the persistent forecast of extremely high temperatures. The alert will remain in effect from Thursday through at least Saturday, with additional districts joining the warning as the heatwave intensifies. IPMA has confirmed that the conditions will extend to regions including Beja, Évora, Portalegre, Santarém, Lisbon, and Setúbal by Thursday, and will further include Aveiro, Braga, Porto, Viana do Castelo, Coimbra, and Leiria by Friday.

According to the meteorological institute, the heatwave is driven by an anticyclone situated to the north and northwest of the Azores. This high-pressure system is expected to maintain its influence over mainland Portugal for at least a week, creating a prolonged period of scorching weather. The forecast highlights that maximum temperatures will reach 35 to 41°C across most of the country, with even higher readings—up to 44°C—predicted in the Tagus Valley and Alentejo regions. Minimum temperatures, too, will remain elevated, surpassing 20°C in many areas and failing to drop below 24 to 28°C during nighttime in regions like Greater Lisbon.

“A prolonged spell of very hot, dry weather is expected, with maximum temperatures reaching between 35 and 41°C across most of the territory, and between 41 and 44°C in the Tagus Valley and Alentejo,” IPMA explains. The institute adds that minimum temperatures will be above 20°C across much of the mainland, with regions where night-time temperatures are not expected to fall below 24 to 28°C for several nights.

Coastal regions are particularly affected, as the lack of a sea breeze or its reduced intensity will exacerbate the heat. IPMA notes that this will create a rare situation in some areas, where temperatures remain consistently high for multiple consecutive days. The earlier forecasts, released on Wednesday, had only designated Lisbon and Setúbal for red alert status, but the situation has evolved, prompting the inclusion of more districts by Friday. This shift underscores the severity of the heatwave and its potential to impact a broader geographic area than initially anticipated.

Alongside the temperature extremes, IPMA has also highlighted the risk of elevated Ultraviolet (UV) Index levels. Until Friday, 3 July, all mainland districts are expected to experience very high to extreme UV values, classified from level 10 to 11. These levels pose significant risks to skin health, especially during peak solar hours. The meteorological institute advises the public to take precautions, such as avoiding prolonged sun exposure and using protective measures like sunglasses, hats, sunscreen, and shaded areas.

Impact of the Heatwave

The combination of high temperatures and low humidity is likely to increase the risk of dehydration, heat exhaustion, and even heatstroke, particularly among vulnerable groups like the elderly and those with pre-existing health conditions. The extended period of extreme weather could also strain energy resources and affect agricultural productivity, as crops may suffer from heat stress and water shortages. IPMA emphasizes the need for vigilance, as the conditions may persist for days, creating a cumulative effect on both human and environmental systems.

Local authorities have begun implementing measures to mitigate the impact of the heat. These include opening cooling centers, encouraging the use of fans and air conditioning, and advising residents to stay hydrated. Public transport systems are also being monitored for potential disruptions, with plans to adjust schedules or provide additional cooling options for passengers. Schools and workplaces are urged to promote flexible hours or allow for breaks during the hottest parts of the day to reduce exposure to extreme temperatures.

Heat Safety Guidelines

IPMA has outlined key recommendations to help individuals protect themselves during the heatwave. These include:

• Staying indoors during peak sunlight hours, typically between 10 a.m. and 4 p.m.
• Wearing loose-fitting, light-colored clothing to allow for better air circulation and reduce heat absorption.
• Ensuring that homes are well-ventilated and using fans or air conditioning to maintain comfortable indoor temperatures.
• Drinking plenty of water regularly, even if not thirsty, to prevent dehydration.
• Checking on neighbors, especially those who live alone, to ensure they are taking necessary precautions.
• Keeping windows open at night to take advantage of cooler temperatures and reduce the need for air conditioning during the day.
• Using sunscreen with a high SPF and reapplying it every two hours, or after sweating, to maintain protection against UV radiation.
• Planning outdoor activities for early morning or late evening when temperatures are lower.
• Keeping pets hydrated and providing shade to prevent them from overheating.
• Monitoring weather updates and adjusting plans accordingly to respond to changing conditions.

The institute warns that the heatwave could lead to dangerous situations, particularly for those without access to cooling facilities. IPMA also highlights the importance of public awareness campaigns to educate communities on the risks associated with extreme heat and how to stay safe. With temperatures forecasted to remain above 40°C in several regions, the warning serves as a reminder that the effects of the heatwave will not be short-lived. The red alert, which is set to last until Sunday, indicates that the country is preparing for a sustained period of intense weather, requiring coordinated efforts to minimize harm to people and infrastructure.

As the heatwave progresses, IPMA continues to monitor its impact and update forecasts. The meteorological institute has noted that the anticyclone’s position is a critical factor in the persistence of these conditions, as it prevents cooler air from moving in and maintaining high temperatures. This situation is expected to improve only after the anticyclone weakens or shifts, which could take several days. Until then, residents are advised to remain cautious and take proactive steps to safeguard their health. The extended alert also raises concerns about the potential for wildfires, as dry conditions and high temperatures increase the risk of vegetation igniting, especially in rural areas.

While the heatwave is a natural phenomenon, its duration and intensity make it a significant challenge for Portugal. The country’s geographical location, with its coastal regions and inland areas experiencing different climatic effects, complicates the response. For example, coastal districts may benefit slightly from sea breezes, but the lack of consistent airflow inland has led to a buildup of heat. The heatwave also coincides with the summer season, which typically sees higher temperatures, but its severity is projected to exceed average conditions by a considerable margin.

IPMA’s forecast highlights that this heatwave is not an isolated event but part of a broader pattern of climate change. The increasing frequency of extreme weather events, including prolonged heatwaves and droughts, is a growing concern for meteorologists and policymakers. The institute’s warning serves as a call to action for both individuals and organizations to adapt to these conditions. By following the recommended safety guidelines and staying informed about weather updates, residents can reduce the likelihood of heat-related illnesses and ensure a safer summer for all.

As the week progresses, the heatwave is expected to peak, with temperatures likely to reach their highest levels in the middle of the alert period. This timing means that the most severe conditions will coincide with the hottest days of the week, requiring heightened vigilance from the public. IPMA has also emphasized that the heatwave’s effects will be felt in both urban and rural areas, with cities experiencing heat island effects and inland regions facing challenges related to agriculture and water supply.

Residents in affected areas are encouraged to share resources, such as water and cooling equipment, to support those who may be more vulnerable to the heat. Community initiatives, including neighborhood check-ins and the distribution of cooling supplies, can play a vital role in mitigating the impact of the extreme weather. Additionally, businesses are advised to implement heat-related policies, such as offering flexible work arrangements or ensuring proper ventilation in workplaces, to protect employees.

With the red alert in place until Sunday, Portugal’s population must prepare for a week of intense heat. The combination of high temperatures, low humidity, and strong UV exposure creates a perfect storm of conditions that can affect both physical and mental well-being. The meteorological institute’s warnings are a critical reminder that extreme heat is not just a temporary inconvenience but a serious public health issue that requires collective action and individual responsibility to overcome.