美国中南部遭遇极端热浪 超4000万人受影响

美国中部和南部地区正在经历第二天的极端热浪，至少4000万人处于极端高温警告范围内12。热指数超过100°F(38°C)，部分西南地区预计达到120°F(49°C)12。南达科他州Rapid City在周六报告了112°F的历史最高温12。

气象学家将此次热浪归因于热穹顶现象，这种大气条件将热量困住，导致高温延长和加剧1。专家警告儿童、老人和有医学疾病的人群面临热中风甚至死亡的风险1。Pete Miller表示："情况极其炎热，我们看到很多人被热量耗尽，这种方式真的很危险"2。为应对极端高温，官方建议民众寻求空调、冷却中心、充分饮水并限制直晒时间2。Canterbury Park的赛马活动因高温被取消2。

周中预计会有暂时缓解，但高温可能在周末回返1。美国大陆2026年上半年是有记录以来第二热的半年2。

A severe heatwave is gripping the central and southern United States for a second consecutive day, with at least 40 million people under extreme heat warnings 12. Heat indices are soaring above 100°F (38°C), with parts of the Southwest expected to reach 120°F (49°C) 12. Rapid City, South Dakota reported a record high of 112°F on Saturday 12.

Meteorologists attribute the prolonged extreme temperatures to a heat dome phenomenon that traps atmospheric heat and intensifies the high temperatures 1. According to Pete Miller, "It's extraordinarily hot," and "We're seeing a lot of people who are exhausted, drained by the heat in a way that is really dangerous" 1. Health officials are warning that children, elderly people, and those with medical conditions face heightened risks of heat stroke and death 1. Experts recommend seeking air-conditioned spaces, visiting cooling centers, staying hydrated, and limiting direct sun exposure 2.

The heatwave is expected to bring temporary relief mid-week, though high temperatures could return by the weekend 1. The first half of 2026 marked the second-hottest half-year on record for the continental United States 12. The event has already disrupted daily life, including the cancellation of horse racing at Canterbury Park due to the dangerous conditions 2.