美国国家气象局天气预报中心 11 月 11 日延伸预报：11 月 14 日至 18 日西海岸多轮降雨与山区降雪、德克萨斯州南部局地雨量 1 至 2 英寸
美国 — 美国国家气象局天气预报中心 2026 年 11 月 11 日凌晨 2 时 20 分（东部时间）发布延伸预报讨论，有效期为 11 月 14 日至 18 日，称届时全美将呈放大型的上层气流格局，西海岸与东海岸各有大尺度槽区。
该中心表示，从加利福尼亚州到华盛顿州将有多轮降雨与山区降雪，东部地区将回到较冷的天气，并有残余的湖效应与迎风坡降水。
第一轮锋面边界将于周五抵达加利福尼亚州，周六到达山间西部，带来谷地降雨与山区降雪。
该中心表示，第二轮更强的锋面将带来更冷的空气，塞拉山脉与北加利福尼亚山区的雪线下降，出现中等量积雪的可能性较大。
预报还称，一条南支槽将于周一前后自沙漠西南部穿向南部平原，可能给德克萨斯州与墨西哥湾沿岸部分地区带来阵雨与雷暴。
该中心表示，周末德克萨斯州南部另有一个中到局地大雨区域，低压波发展时，德克萨斯州墨西哥湾沿岸附近局地雨量可能达 1 至 2 英寸。
该中心表示，本周末的模式指导总体一致性良好。以上为预报讨论原文口径，后续以气象局更新为准。
National Weather Service Weather Prediction Center Extended Forecast Issued November 11: Multiple Rounds of Rain and Mountain Snow for the West Coast from November 14 to 18, Locally 1 to 2 Inches Near the Texas Gulf Coast
United States — The National Weather Service Weather Prediction Center issued a preliminary extended forecast discussion at 2:20 a.m. Eastern Time on November 11, 2026, valid from November 14 to 18, saying an amplified upper level flow pattern will be in place, with large scale troughs encompassing both the West Coast and the East Coast.
Multiple rounds of rain and mountain snow are expected from California to Washington, and a return to colder weather across the East Coast region with some lingering lake effect and upslope precipitation, the center said.
The first round of frontal boundaries will arrive on Friday across California, and then reach the Intermountain West by Saturday with valley rain and mountain snow.
A second and stronger front heralds the arrival of colder conditions with lowering snow levels across the Sierra and northern California ranges, with moderate accumulations likely, the center said.
South of the ridge, a southern stream trough crossing from the Desert Southwest to the southern Plains through Monday will likely bring showers and storms to parts of Texas and the Gulf Coast region in general, according to the discussion.
Another area of moderate to locally heavy rainfall is also expected across portions of southern Texas over the weekend, with locally 1 to 2 inches possible near the Texas Gulf coast as a wave of low pressure develops, the center said.
The center said the model guidance suite features good overall agreement across the United States domain for this weekend. The figures above are from the forecast discussion text and remain subject to updated forecasts.
发布：GSM·美国（发布链接）
图片来源：图：卫星云图上覆盖美国西海岸的风暴云系。GOES imagery: CSU/CIRA & NOAA 供图，公共领域，经 Wikimedia Commons / Photo: Storms Batter the California Coast (CIRA 2023-12-21). By GOES imagery: CSU/CIRA & NOAA, public domain, via Wikimedia Commons
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