Predecessor Rain Events ahead of Tropical Cyclones
Predecessor Rain Events ahead of Tropical Cyclones
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DOI：
10.1175/2010mwr3243.1
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发表时间：
2010-08
影响因子：
3.2
通讯作者：
Thomas J. Galarneau;L. Bosart;R. Schumacher
中科院分区：
文献类型：
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作者：
Thomas J. Galarneau;L. Bosart;R. Schumacher
从天气气候学和个例研究的角度分析了1995-2008年发生在美国落基山脉以东的28次前身降雨事件(PRES)。PRES是相关的中尺度强降雨区域，降雨率为≥100 mm(24小时)−1，可出现在下弯热带气旋极地约1 000公里处。PRES最常见出现在8月和9月，大约在与TC有关的主要雨罩到达之前36小时。PRES的一个显著特征是，它们是由热带深层湿气维持的，这些湿气直接从热带气旋向极地输送。PRES是影响很大的天气事件，通常会导致严重的内陆洪水，要么是由于PRE本身，要么是因为与热带气旋相关的主要雨幕随后到达，落在已经被PRE饱和的土壤上。综合分析表明，在天气尺度上，200百帕急流赤道入口区有PRES形成。
Abstract Twenty-eight predecessor rain events (PREs) that occurred over the United States east of the Rockies during 1995–2008 are examined from a synoptic climatology and case study perspective. PREs are coherent mesoscale regions of heavy rainfall, with rainfall rates ≥100 mm (24 h)−1, that can occur approximately 1000 km poleward of recurving tropical cyclones (TCs). PREs occur most commonly in August and September, and approximately 36 h prior to the arrival of the main rain shield associated with the TC. A distinguishing feature of PREs is that they are sustained by deep tropical moisture that is transported poleward directly from the TC. PREs are high-impact weather events that can often result in significant inland flooding, either from the PRE itself or from the subsequent arrival of the main rain shield associated with the TC that falls onto soils already saturated by the PRE. The composite analysis shows that on the synoptic-scale, PREs form in the equatorward jet-entrance region of a 200-hPa je...