重点提示:(1)冷暖气团犬牙交错,南方降水持续; (2)华北周边持续污染,长江以南空气质量优良,呈现北高南低态势;
天气形势:
21日一股弱冷空气自黄土高原突入内陆腹地,早八时弱高压中心位于湖北西部,而东北、西南及东海上空仍受低压系统控制。受冷暖气团交汇影响,长江以南及东北地区大范围降水。
图1 2015年02月21日地面天气图(08:00 UTC+8)和污染气象预报图 (图片来源:中央气象台)
预报回顾:
当日矮马全国AQI预报与实测结果空间分布略有偏差。观测显示污染中心仍位于首都周边的京津冀地区,东北及长江以南地区空气质量良好。
图2 2015年02月21日AQI空气质量预报与实况比较(左:矮马预报;右:CNEMC数据平台)
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