罕见风暴横扫亚利桑那：高尔夫球大冰雹与2010年以来首次龙卷风警戒
美联社10月21日晚间报道，一场罕见的强风暴吹袭美国西部，高尔夫球大小的冰雹与破坏性阵风横扫亚利桑那州北部与中部。强雷暴自周二夜间至周三横过该州，国家气象局发布多项警报，冰雹直径达2至3英寸（约5至7.6厘米），砸坏屋顶、击碎窗户、砸凹车辆，气象局呼吁民众寻找掩蔽、远离窗户。本轮发布的龙卷风警戒是亚利桑那州自2010年10月以来首次出现。
Flagstaff 与 Mesa 有大树被强风吹倒，有的压上墙体与车棚；科科尼诺国家森林内，Flagstaff 西北有数十棵高逾30英尺（约9米）的黄松倒伏。国家气象局 Flagstaff 气象学家 Ryan Bernhart 说，这种天气在当地、这个时节「非常少见」。暖湿气流自加州海岸北上、风向变化令风暴得以旋转，是本轮异常天气的成因。
凤凰城都会区接下来最大的威胁转为强降雨与山洪：凤凰城气象局气象学家 Mark O'Malley 表示，周三夜间至周四（10月22日）上午是山洪风险最高时段，凤凰城都会区洪水观察持续至周四下午，高地地区持续至周四晚间。
Rare Storm Pummels Arizona With Golf Ball-Sized Hail and First Tornado Watch Since 2010
A rare, powerful storm tore across the U.S. West on October 21, pummeling northern and central Arizona with golf ball-sized hail and destructive winds, the Associated Press reported. Severe thunderstorms swept the state from Tuesday night into Wednesday, prompting multiple National Weather Service warnings. Hail measuring 2 to 3 inches in diameter damaged roofs, shattered windows and dented vehicles. The tornado watch issued during the storm was Arizona's first since October 2010.
Large trees were toppled in Flagstaff and Mesa, some crashing onto walls and carports, and dozens of ponderosa pines over 30 feet tall were felled northwest of Flagstaff in the Coconino National Forest. National Weather Service meteorologist Ryan Bernhart in Flagstaff called the weather very unusual for the area and season.
For the Phoenix metro area, the main threat shifted to heavy rain and flash flooding, with the highest risk from Wednesday night into Thursday morning, Phoenix meteorologist Mark O'Malley said.
发布：GSM·美国（发布链接）
图片来源：图：凤凰城市中心雨夜。摄影：Alan Stark from Goodyear, AZ, United States，CC BY-SA 2.0（Wikimedia Commons）。Photo: downtown Phoenix on a rainy night. Photo by Alan Stark from Goodyear, AZ, United States, CC BY-SA 2.0 (Wikimedia Commons).
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