菲律宾国家气象局表示，马尼拉大都会及菲律宾各地多个地区预计在5月19日（周二）将出现达到危险等级的热指数。
据菲律宾大气地球物理和天文服务管理局（Pagasa）称，热指数是指当湿度叠加在实际气温之上时，人体感知的炎热程度。42至51摄氏度的数值属于危险类别，在此条件下，人体容易出现热痉挛和热衰竭，若长时间暴露在户外，更有可能中暑。
Pagasa气象专家Veronica Torres表示，马尼拉大都会今日的热指数预计将在40至43摄氏度之间。帕赛市的气温可能高达43摄氏度，而甲米地市的桑利角可能达到45摄氏度，为当天全国最高。包括西民都洛省圣何塞、卡皮兹省罗哈斯市以及北三宝颜省迪波洛格在内的地区预计将达到44摄氏度。
截至周一下午5点，马尼拉大都会记录的热指数为41至43摄氏度，其中桑利角再次录得最高值，达到45摄氏度。Pagasa建议公众在午后高温时段限制户外活动，保持充足水分，并避免长时间暴露在极端高温下。
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Mexico City's Secretaría de Gestión Integral de Riesgos y Protección Civil (Sgircp/SGIRPC) issued an alert for temperatures up to 31 degrees Celsius this weekend, particularly during Andrea Bocelli's free Romanza Tour concert at the Zócalo on Saturday, April 18. Very hot afternoon conditions are forecast with partly cloudy skies and possible light scattered rains at night. Officials recommend sunscreen, hydration, cotton clothing, avoiding prolonged sun exposure, and street food due to spoilage risks.
PAGASA reported several areas reached borderline “extreme caution” heat index after a cold snap due to weakening northeast monsoon. The index ranges from 33 to 41 degrees Celsius, potentially causing heat cramps and exhaustion. Cotabato City and Zamboanga City neared 40 degrees Celsius.
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The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) projects “danger” level heat index of 42 degrees Celsius in four areas. These include Catarman in Northern Samar, Zamboanga City, Cotabato City, and Dumangas in Iloilo, based on yesterday's forecast. Officials urge the public to limit sun exposure and stay hydrated.
The Environmental Commission of the Megalopolis (CAMe) declared Phase 1 Environmental Contingency on Saturday, April 25, in Mexico City and Mexico State due to high ozone levels from a heat wave. Expanded vehicle restrictions apply today, Sunday, April 26, under the Double Hoy No Circula program from 5:00 to 22:00. Temperatures in CDMX will reach 30 to 32 degrees Celsius.
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The National Meteorological Service anticipates three to five heat waves in central Mexico from March to May 2026, with temperatures up to 4 degrees Celsius above average. The Megalopolis Environmental Commission estimates this could trigger up to 15 days of ozone contingency, imposing stricter vehicle restrictions in Mexico City and the State of Mexico.
On Wednesday, Cape Town entered the third day of a severe heatwave, with temperatures reaching highs of over 40°C in several areas. Locals and visitors sought relief by heading to the water, as captured by photojournalist David Harrison.
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The Philippine Atmospheric, Geophysical and Astronomical Services Administration (Pagasa) expects a tropical cyclone to form this April, potentially entering the Philippine area of responsibility (PAR) and making landfall, weather specialist Benison Estareja said.