Mainland Portugal has been placed under a government-declared state of alert for Wednesday as meteorologists warn that the arrival of depression Charles and the ongoing passage of storm Bruna could trigger a rare and destructive meteorological event known as a "sting jet," capable of generating localized wind gusts exceeding 160 kilometers per hour.
In response to the approaching severe weather, Minister for Internal Administration Luís Neves announced the total closure of all public and private schools as well as non-essential public services across mainland Portugal. Authorities have also prohibited public access to parks, forests, and gardens, while urging citizens to remain at home. Neves warned of potential "very tough moments of need for rescue," pointing to high risks of urban flooding, falling trees, and power supply interruptions.
The Portuguese Institute for Sea and Atmosphere (IPMA) has placed eight districts under a top-level red alert through 9 p.m. on Wednesday: Beja, Évora, Faro, Leiria, Lisbon, Portalegre, Santarém, and Setúbal. Forecasters highlighted the Greater Lisbon metropolitan area as requiring extraordinary vigilance, with the greatest threat of extreme wind development anticipated between midday and late afternoon.
Addressing the potential formation of a sting jet during a Civil Protection preventative press conference on Tuesday, IPMA meteorologist Jorge Ponte acknowledged that while the phenomenon is notoriously difficult to forecast, indicators are present. "There are some signs that it may occur, but it is very difficult to predict. That is what happened in storm Kristin and it is on the table," Ponte stated, recalling the early-year storm Kristin that devastated multiple regions across the Leiria district.
Meteorologists define a sting jet as a rapid air current that descends from the mid-levels of an extratropical cyclone, accelerating violently as it reaches the surface over a localized area. Climate change specialist Duarte Costa explained on social media that ECMWF European model simulations display a distinct hooked structure with "a dangerous similarity to the sting jet phenomenon." Costa described the event as "an extremely violent jet of wind that descends from the mid-levels of a storm down to the surface, suddenly and in a very localised way as a result of a strong intensification as it passes through a jet stream." He warned that unlike storm Kristin, the current storm is expected to peak during daylight hours, compounding risks if severe gusts coincide with rush-hour travel.
To mitigate municipal hazards, authorities in Lisbon ordered the midnight closure of all city road tunnels, car parks, and select bridges. Speed limits on the Vasco da Gama and 25 de Abril bridges, which span the River Tagus, have been restricted to 60 km/h, and officials strongly discourage motorcycle travel. While rail operators Metro de Lisboa and Fertagus plan to keep services running, municipal bus operator Carris warned operations could be subject to changes throughout the day. Meanwhile, long-distance coach operator Rede Expressos announced a total suspension of its services between 10:00 a.m. and midnight on Wednesday.
