据菲律宾大气地球物理和天文服务管理局（Pagasa）预报，受热带辐合带（ITCZ）影响，5月18日周一，棉兰老岛南部部分地区将出现多云天气，并伴有分散性阵雨和雷暴。
菲律宾大气地球物理和天文服务管理局表示，热带辐合带将影响三宝颜半岛、棉兰老穆斯林邦萨摩洛自治区、南哥打巴托-哥打巴托-苏丹库达拉特-萨兰加尼-桑托斯将军市地区（Soccsksargen）以及达沃地区。Pagasa气象专家Aldczar Aurelio指出，预计该天气系统对棉兰老岛的影响将持续至周二，并于周三逐渐减弱移出。
受偏东风影响，菲律宾全国其他地区将持续高温闷热天气。预计马尼拉大都会的气温将在25°C至33°C之间，而其他多个城市的气温最高可达35°C。
目前，菲律宾责任区内外尚未监测到热带气旋或低压区。周日，全国多地录得高达45°C的危险级别高温指数。
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The Philippine weather bureau on Tuesday said it is tracking two low-pressure areas that are not expected to develop into tropical cyclones or bring direct effects to the country.
The low pressure area formerly known as Tropical Cyclone Caloy is forecast to weaken and dissipate over the Philippine Sea by Friday or Saturday without affecting the country.
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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.
Tropical Storm Caloy, international name Hagupit, remains over the Philippine Sea and is forecast to weaken into a tropical depression on Sunday.
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A well-marked low-pressure area over the southwest Bay of Bengal has recurved northeastwards, likely to bring light to moderate rain in isolated places in the Western Ghat districts, according to the Regional Meteorological Centre in Chennai. Dry weather is forecast over the rest of Tamil Nadu, Puducherry, and Karaikal on Monday and Tuesday.