洛杉矶县红旗警告：本季首场圣安娜风10月15日至16日过境，山区阵风可达70英里、相对湿度低至5%–15%

洛杉矶——国家气象局洛杉矶/奥克斯纳德办公室10月13日下午发布红旗警告，本季首场圣安娜风事件将于10月15日至16日过境南加。警告自10月15日（周四）上午6时起生效，至10月16日（周五）晚10时（太平洋时间）结束，覆盖洛杉矶县的圣克拉丽塔谷、马里布海岸、卡拉巴萨斯与阿古拉山、圣费尔南多谷、圣盖博谷等地区。紧邻洛杉矶县、但不在南加五县范围内的文图拉县，其海滩、内陆海岸与中央谷地同在警告范围内，气象局在同一份警告中一并列出。

气象局给出的具体数值是：东北至东风风速20至30英里/小时，阵风40至50英里/小时，丘陵地带局地阵风可达50至60英里/小时；气象局同日的火险天气讨论进一步指出，洛杉矶与文图拉两县的迎风山区在周四至周五的峰值时段局地阵风可达60至70英里/小时。相对湿度方面，谷地与海岸地区最低值普遍降至5%至15%，山区为8%至20%；周五白天高温将升至85至95华氏度。气象局在警告中表示，一旦起火，当前条件有利于极端火行为，将威胁生命与财产安全。

按气象局的进程预报，这股中到局地强的圣安娜风将于周四迅速增强，周四下午至周五下午达到峰值，随后在周末减弱；部分地区的红旗条件可能延续至周六。圣巴巴拉县与圣路易斯奥比斯波县内陆地区周五也可能出现红旗条件，气象局已对该区域发布火险天气观察。此前周日、周一的降雨主要落在洛杉矶县以南，据国家气象局预报员向《洛杉矶时报》介绍，洛杉矶与文图拉两县大部分地区植被仍非常干燥，10月初还经历过破纪录热浪，新火一旦发生有快速蔓延的高风险。

来源：据国家气象局洛杉矶/奥克斯纳德办公室10月13日发布的红旗警告原文与当日火险天气讨论，及《洛杉矶时报》10月13日报道整理。

Red Flag Warning for Los Angeles County: Season's First Santa Ana Winds Arrive Oct. 15-16, Mountain Gusts to 70 mph, Relative Humidity as Low as 5-15%

LOS ANGELES — The National Weather Service office in Los Angeles/Oxnard issued a Red Flag Warning on the afternoon of October 13 as the season's first Santa Ana wind event approaches Southern California on October 15–16. The warning runs from 6 a.m. on Thursday, October 15, to 10 p.m. PDT on Friday, October 16, covering Los Angeles County's Santa Clarita Valley, the Malibu Coast, Calabasas and Agoura Hills, the San Fernando Valley and the San Gabriel Valley. Neighboring Ventura County — which lies outside the five Southern California counties in GSM's coverage framework — is included in the same warning for its beaches, inland coast and central valleys.

The weather service put the numbers as follows: northeast to east winds of 20 to 30 mph with gusts of 40 to 50 mph, and isolated gusts of 50 to 60 mph possible in the hills. In its fire weather discussion the same day, the agency said localized gusts of 60 to 70 mph are possible in the wind-prone mountains of Los Angeles and Ventura counties during the Thursday-to-Friday peak. Relative humidity minimums of 5 to 15 percent will be common in the valleys and along the coast, and 8 to 20 percent in the mountains, with high temperatures of 85 to 95 degrees by Friday. The warning states that if a fire ignites, conditions are favorable for extreme fire behavior that would threaten life and property.

Forecasters expect the moderate to locally strong Santa Ana winds to develop quickly on Thursday, peak from Thursday afternoon through Friday afternoon, then weaken over the weekend; some areas may see Red Flag conditions linger into Saturday. Interior Santa Barbara and San Luis Obispo counties may also reach Red Flag conditions on Friday and are under a Fire Weather Watch. Rain on Sunday and Monday fell mostly south of Los Angeles County, and a National Weather Service meteorologist told the Los Angeles Times that vegetation across Los Angeles and Ventura counties remains very dry after a record-breaking heat wave in early October, leaving a high risk that any new fire could grow very fast.

Source: Compiled from the National Weather Service Los Angeles/Oxnard Red Flag Warning text and fire weather discussion issued October 13, and the Los Angeles Times report of October 13.

图片来源：圣安娜风助长南加野火的卫星资料图（2017年12月托马斯山火烟羽被离岸风吹向太平洋），美国国家海洋和大气管理局（NOAA/NESDIS），公有领域（Wikimedia Commons）

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