美国国家气象局对洛杉矶县中东部发布山洪警告：San Dimas 等五城及 Bridge 火烧迹地在列，有效至下午2时
美国国家气象局（National Weather Service，NWS）洛杉矶／Oxnard 办公室 10 月 22 日上午 11 时 24 分对加州洛杉矶县中东部发布山洪警告（Flash Flood Warning），有效至当日下午 2 时。警告覆盖的城市包括位于洛杉矶县中东部的 San Dimas、Glendora、Pomona、La Verne 与 Claremont，并包括 Bridge 火灾火烧迹地的中部与南部地带。
气象局表示，上午 11 时 24 分，多普勒雷达显示雷暴正在警告区域上空产生强降雨，预计雨强为每小时 0.5 至 1 英寸，山洪已经发生或预计很快开始。除山洪外，落石、滑坡以及小规模碎屑流也可能发生。气象局称，可能受山洪影响的地点包括小溪与溪流、城区、公路、街道与地下通道，以及其他排水不良与低洼地带。警告文本未包含疏散令。
这场秋季风暴自 10 月 21 日起进入南加州。气象局此前已对 Malibu 海岸及 Santa Monica 山区发布洪水监视（Flood Watch），有效至 10 月 22 日下午 4 时，指该区域雨强同样可能达到每小时 0.5 至 1 英寸，街道可能出现大范围积水；同日上午，气象局还对洛杉矶县与 Ventura 县多地发布洪水咨询（Flood Advisory），有效至下午 1 时至 2 时不等。上午 11 时 19 分的特别天气声明称，洛杉矶县南部与东部强阵雨与雷暴持续，阵风可达每小时 50 英里，并伴有豌豆大小的冰雹，San Dimas、Glendora、Pomona、La Verne 等地在影响范围内；上午 10 时 26 分，气象局曾对洛杉矶县东南部发布强雷暴警告，Whittier 附近阵风达每小时 60 英里、伴有一分钱硬币大小的冰雹，并提示龙卷风的可能。
气象局在警告中表示，车辆涉水是洪水致死的主要情形，呼吁驾驶人遇积水路段掉头绕行，并遵从应急管理、执法与消防机构人员的指示。截至中午 12 时许，未见官方发布与本次警告相关的伤亡或损失报告；警告到期后是否延长或解除，以气象局后续发布为准。
National Weather Service Issues Flash Flood Warning for East Central Los Angeles County: San Dimas, Glendora, Pomona, La Verne and Claremont Through 2 PM
The National Weather Service (NWS) office in Los Angeles/Oxnard issued a Flash Flood Warning at 11:24 a.m. on October 22 for east central Los Angeles County, California, in effect until 2 p.m. the same day. The warning covers the cities of San Dimas, Glendora, Pomona, La Verne and Claremont in east central Los Angeles County, and includes the central and southern parts of the Bridge Fire burn scar.
The weather service said Doppler radar at 11:24 a.m. indicated thunderstorms producing heavy rain across the warned area, with an expected rainfall rate of 0.5 to 1 inch in one hour, and that flash flooding was ongoing or expected to begin shortly. In addition to flash flooding, rock slides, mud slides and minor debris flows are possible, the NWS said. Locations that may experience flash flooding include small creeks and streams, urban areas, highways, streets and underpasses, as well as other poor drainage and low-lying areas. The warning text contains no evacuation order.
The autumn storm moved into Southern California on October 21. The NWS had earlier issued a Flood Watch for the Malibu Coast and the Santa Monica Mountains recreational areas through 4 p.m. on October 22, saying rain rates there could also reach 0.5 to 1 inch per hour and that extensive street flooding was possible. Flood Advisories were also in effect late Thursday morning for parts of Los Angeles and Ventura counties until 1 p.m. to 2 p.m. A Special Weather Statement issued at 11:19 a.m. said strong showers and thunderstorms would continue across southern and eastern Los Angeles County, with wind gusts up to 50 mph and pea-size hail, listing San Dimas, Glendora, Pomona and La Verne among the locations impacted. At 10:26 a.m., the NWS had issued a Severe Thunderstorm Warning for southeastern Los Angeles County, where a storm near Whittier brought 60 mph wind gusts and penny-size hail, with a tornado possible.
In the warning, the NWS said most flood deaths occur in vehicles and urged drivers to turn around when encountering flooded roads and to follow directions from emergency management, law enforcement and fire agency officials. As of about noon, no official reports of casualties or damage tied to this warning had been released; whether the warning is extended or allowed to expire will be determined by later NWS updates.
发布：GSM·美国（发布链接）
图片来源：图：Glendora 与圣盖博（San Gabriel）山麓社区资料图，Glendora 是本次山洪警告覆盖的城市之一。摄影：jaymanuel，CC BY-SA 4.0，维基共享资源。Photo: File photo of Glendora and the San Gabriel Mountain foothills; Glendora is one of the cities covered by the warning. Photo by jaymanuel, CC BY-SA 4.0, via Wikimedia Commons.
GSM Global · 本篇英文版 English edition of this story
