South Korea recorded its highest temperature since modern observations began in 1904, with the city of Yangsan reaching 42.5C as temperatures exceeded 40C for a fifth consecutive day. Authorities warned residents to "immediately stop all outdoor activities." The Guardian reports: More than 20 localities in South Korea were under emergency heatwave alerts on Sunday -- a new warning category introduced this year to better address rising temperatures. An emergency alert is issued when areas experiencing a heatwave are forecast to hit perceived temperatures of 38C or an actual temperature of 39C for the day. Issuing a heat warning, the weather agency urged people to "immediately stop all outdoor activities," adding that "indoor spaces without air conditioning are dangerous." "Move immediately to a cool place, such as a designated cooling centre or a shaded area, and stay hydrated while resting," it advised. Fearing for those people most vulnerable to heat, the prime minister, Han Seong-sook, ordered local officials to strengthen safety checks on residents and to ensure a stable power and water supply was maintained. [...] Korea Meteorological Administration (KMA) data show the average annual number of heatwave days in the country has more than doubled to 19 in the past five years.

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The U.S. company Meteomatics has created an automated weather-monitoring system that uses drones to collect atmospheric data at multiple altitudes before returning to recharge and upload their findings. The so-called Meteobase, which consists of a base station on the ground with a drone that can be launched and recovered automatically, "is highly weather resistant and keeps the drone at a comfortable temperature," reports The Guardian. "It can send out one data-gathering mission a day, or multiple flights to monitor fog, icing, an advancing weather front, or other fast-changing conditions." The report says the reusable drones could offer a cheaper, more controllable alternative to helium weather balloons, especially for tracking rapidly changing conditions.

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