美国天气预报中心警告「生命与财产处于极大危险」，并预期将出现严重、广泛的暴洪。风暴影响预计从圣诞假期持续到周五；洛杉矶郡与橙郡部分峡谷社区出现撤离，并伴随道路封闭、快速道路淹水与航班延误。
关键数据：洛水电局服务区约10,700户于周三上午停电；州府预先部署55辆消防车与10支急流救援队。峰值降雨率最高可达每小时1.5英吋（3.8公分）；圣诞夜当地时间晚间10点前，部分地区累积雨量上看9英吋（25公分），至周五总雨量可能达14英吋（35公分）。最大阵风达82英里/小时（132公里/小时）；高山地区（如Mammoth Mountain）周三白天新雪累积上看23英吋（58公分）。
A powerful winter storm is hitting Southern California, prompting an emergency declaration for Los Angeles and nearby counties. Forecasters warn that several months of rain could fall in just a few days, and burn-scar terrain from last year’s wildfires sheds water rather than absorbing it, raising flash-flood and mudslide risk.
The Weather Prediction Center said lives and property are in great danger and expects severe, widespread flash flooding. Impacts run through the Christmas holiday until Friday, with evacuations in parts of Los Angeles and Orange counties plus road closures, flooded freeways, and flight delays; one Angeles Crest Highway segment closed Wednesday morning.
Key numbers: about 10,700 LADWP customers lost power Wednesday morning; the state pre-positioned 55 fire engines and 10 swiftwater rescue teams. Peak rainfall may reach 1.5 in/hr (3.8 cm/hr). Some foothills and mountains could see up to 9 inches (25 cm) by 10 p.m. Christmas Eve and as much as 14 inches (35 cm) by Friday. A gust hit 82 mph (132 km/h). Mammoth Mountain forecast up to 23 inches (58 cm) of daytime snow Wednesday.
