2026-03-18T14:24:00-0400 / CBS新闻
一股持续时间较长的热浪正在美国西部形成，并预计未来几天将持续存在。
美国西部上空的高压系统导致降水稀少，这也使得大片区域出现创纪录的高温。沙漠西南部预计将出现三位数的气温，而距离太平洋更近的城市可能也会出现反常的高温。
美国西部正遭遇热浪侵袭。CBS新闻
下周上半周，预计将有超过600个破纪录的气温记录，涉及每日最高气温和夜间最低气温。一些主要城市如凤凰城的某些日气温预计将打破百年历史记录。
美国西部正遭遇热浪侵袭。CBS新闻
周三，凤凰城预计将迎来有记录以来最早的100华氏度高温日。目前的该记录是1988年3月26日创下的。
美国西部正遭遇热浪侵袭。CBS新闻
自1896年以来，”太阳谷”（凤凰城的别称）就有气温记录。
从技术角度讲，什么是热浪？
热浪是指一段异常炎热的天气，通常持续两天或更长时间。并且该地区的气温必须偏离历史平均水平。例如，凤凰城夏季100华氏度的气温相当常见，但在春季正式开始前出现100华氏度的天气就会被归类为热浪。
极端高温预警和高温 advisories（ advisories此处根据中文习惯译为“提示”）至少在周日之前在西南部地区生效，并且可能会延长。这些预警适用于旧金山、洛杉矶、圣地亚哥、棕榈泉、拉斯维加斯、凤凰城和图森等主要城市。
美国西部正遭遇热浪侵袭。CBS新闻
与其他所有天气现象（龙卷风、洪水、闪电等）加起来相比，高温是与天气相关的首要致死原因。如果你必须长时间待在户外，请多喝水，在阴凉处或有空调的建筑内休息，并减少剧烈活动。
热浪期间，儿童在高温汽车内死亡的情况也会增加，而且这种情况在夏季来临前就可能引发关注，因为它在此时更常见。
https://www.cbsnews.com/video/heat-wave-hits-southwest-and-west-as-dozens-of-record-highs-are-set/
Maps show forecast for extreme heat wave scorching the West
2026-03-18T14:24:00-0400 / CBS News
A long-duration heat wave is taking shape over the western half of the U.S. and forecast to stick around in the days ahead.
A high pressure system in place over the West is keeping precipitation out, which is also allowing for record heat across a large region. Triple-digit temperatures are forecast in the Desert Southwest but cities even closer to the Pacific Ocean could see unseasonably high temperatures.
A heat wave is taking shape over the western U.S. CBS News
More than 600 record-breaking temperatures are expected through the first half of next week for daily highs and overnight lows. Some daily temperatures are forecast to break century-old records in some major cities like in Phoenix.
A heat wave is taking shape over the western U.S. CBS News
For Wednesday, Phoenix is forecast to see its earliest 100-degree day on record. The current such record was set on March 26, 1988.
A heat wave is taking shape over the western U.S. CBS News
Record keeping in the “Valley of the Sun” has been reported since 1896.
What is a heat wave, technically?
A heat wave is defined as a period of unusually hot weather that typically lasts two or more days. The temperatures also must be outside the historical average for a given area. For instance, a 100-degree temperature is pretty typical in Phoenix during the summer but before the official start to spring would be classified as a heat wave.
Extreme heat warnings and heat advisories are in effect through at least Sunday across the Southwest and could possibly be extended. These alerts are in effect for major cities such as San Francisco, Los Angeles, San Diego, Palm Springs, Las Vegas, Phoenix and Tucson.
A heat wave is taking shape over the western U.S. CBS News
Heat is the No. 1 weather-related killer compared to all of other weather phenomena combined (tornadoes, flooding, lightning, etc). If you have to be outside for extended periods of time, drink plenty of water, take breaks in shade or inside an air-conditioned building, and limit any strenuous activities.
Hot car deaths of young children also rise during heat waves and this could be a cause for concern well before the summer months when it is more common.
https://www.cbsnews.com/video/heat-wave-hits-southwest-and-west-as-dozens-of-record-highs-are-set/
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