拉斯维加斯发布山洪警告：热带系统雷切尔残余带来暴雨，部分路段积水、公交延误
10月11日（周日），与热带系统“雷切尔”残余环流相关的湿热气流给南内华达带来强降雨，拉斯维加斯谷地部分地区发布山洪警告。美国国家气象局的雷达估算显示，受警告区域部分地点的降雨量达到1.5至3英寸。
据拉斯维加斯当地媒体报道，山洪警告覆盖克拉克县中西部部分地区，包括拉斯维加斯市及周边社区。周日上午发布的警告原定于当天上午8时30分解除，但国家气象局同时发布洪水观察预警，有效期持续至10月12日（周一）凌晨5时（太平洋时间），并发布大风预警，预计谷地阵风可达45至55英里/小时。
受降雨影响，拉斯维加斯地区交通委员会（RTC）周日上午通报，101路和102路公交出现天气原因延误。气象部门提醒，山洪是沙漠地区最危险的天气灾害之一，驾驶员切勿驶入被水淹没的道路，也不要进入正在流水的泄洪道。
此次降雨是“雷切尔”残余环流北上影响美国西南内陆的一部分。该系统10日晚在墨西哥下加利福尼亚州北部登陆后减弱为后热带气旋，其残余云系给南加州、内华达、犹他和亚利桑那部分地区带来强降雨。气象部门表示，洪水观察意味着具备发生洪水的条件，但并不意味着洪水一定会发生。
（消息来源：Las Vegas News；美国国家气象局，10月11日）
Flash Flood Warnings Issued in Las Vegas as Rachel's Remnants Bring Heavy Rain
On Sunday, October 11, moisture from the remnants of tropical system Rachel brought heavy rain to Southern Nevada, prompting flash flood warnings across parts of the Las Vegas Valley. Radar estimates from the National Weather Service put rainfall at roughly 1.5 to 3 inches in portions of the warned area.
According to Las Vegas media, the warnings covered west-central Clark County, including areas of Las Vegas and nearby communities. The morning warning was scheduled to expire at 8:30 a.m. Sunday, but the Weather Service also issued a flood watch effective until 5 a.m. PDT Monday, October 12, along with a wind advisory forecasting valley gusts of 45 to 55 mph.
The Regional Transportation Commission (RTC) reported weather-related delays on bus routes 101 and 102 on Sunday morning. Forecasters warn that flash flooding is one of the desert's most dangerous weather hazards: drivers should never enter a flooded road or a flowing wash.
The rain is part of Rachel's northward push into the interior Southwest. The system made landfall in northern Baja California on Saturday night before weakening into a post-tropical cyclone, with its remnants bringing heavy rain to Southern California, Nevada, Utah, and Arizona. A flood watch means conditions are favorable for flooding — not that flooding is certain.
(Sources: Las Vegas News; National Weather Service, October 11)
图片来源：图：拉斯维加斯谷地亨德森Pittman Wash泄洪渠在暴雨后水位暴涨（资料图）。摄影：Julie Vazquez，CC BY 2.0，来源：Wikimedia Commons
