加州 Sierra Nevada 发布冬季风暴观察，6000英尺以上预计6至12英寸降雪
美国国家气象局 Hanford 办公室 11 月 11 日晚发布预报讨论，加州 Sierra Nevada 已发布冬季风暴观察，自周五下午 4 时起生效至下周二凌晨 4 时，6,000 英尺以上地区预计降雪 6 至 12 英寸。
预报称，周五夜间至周六、周日夜间至周二，多轮风暴系统将先后影响中加州。第一轮系统中，周五上午至周六上午 Sierra Nevada 山脊线一带降雪达到至少一英尺的概率为 80% 至 90%，低海拔 Sierra 与山麓地带降雨量预计 1.00 至 1.50 英寸，雪线约在 6,000 英尺。此前持续的高压脊将于周四东移，周五起气温明显下降。
同批警报还包括周五上午 10 时至周六上午 7 时对 Mojave 坡地与沙漠地带的大风警报，以及 San Luis 水库与 Lake Isabella 的湖风警报。气象局提醒，下周还将有第三个系统抵达，不稳定天气可能持续整周，山口以上路段出行需留意路况。
Winter Storm Watch for California's Sierra Nevada: 6 to 12 Inches of Snow Above 6,000 Feet
A Winter Storm Watch is in effect for California's Sierra Nevada from 4 p.m. Friday through 4 a.m. next Tuesday, with 6 to 12 inches of snow expected above 6,000 feet, the National Weather Service office in Hanford said in its forecast discussion issued Wednesday night, November 11.
Multiple storm systems from Friday night through Saturday and again Sunday night through Tuesday will bring much-needed rain to the Central Valley and Sierra Nevada foothills. For the first system, forecasters put the probability of at least a foot of snow over the Sierra crest between Friday morning and Saturday morning at 80 to 90 percent, with 1.00 to 1.50 inches of rain in the lower Sierra and adjacent foothills and snow levels around 6,000 feet. A persistent ridge of high pressure shifts east by Thursday evening, and temperatures drop sharply into the weekend.
The same outlook includes a Wind Advisory from 10 a.m. Friday to 7 a.m. Saturday for the Mojave slopes and desert, and lake wind advisories for San Luis Reservoir and Lake Isabella. A third system is expected next Wednesday, keeping the weather unsettled for much of next week, with impacts mainly above pass levels.
来源：美国国家气象局
发布：GSM·美国（发布链接）
图片来源：图：Sierra Nevada 雪峰。Wikimedia Commons，CC0。 / Photo: Snow-capped peaks of the Sierra Nevada. Wikimedia Commons, CC0.
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