2006年8月9日桑美、寶發颱風之環流輻合區位於台灣上空，東吉島南方出現橫跨台灣海峽且生命期長達18小時的中尺度強線狀對流（Mesoscale Convective Line，以下簡稱MCL）。根據雷達觀測可將其生命期之0～5 h定義為「發展期」，為寶發留下之微弱雨帶在原地發展；第5～8 h定義為「成熟滯留期」，特徵為大於50 dBZ之回波近似滯留，且其西側向西南方彎曲，內部的對流胞由東側發展向西側傳送。第8-15 h為「成熟移動期」，此期MCL往北移動約80 km，且回波之中段垂直結構隨高度向南傾斜，強度仍維持在50 dBZ以上。第15-18 h為「消散期」，在MCL南北兩側出現張裂分離且回波迅速減弱。
WRF模擬顯示，在MCL生成之前，雙颱之外圍環流越過中央山脈後，因絕熱增溫作用，於背風側產生南北兩個中尺度低壓。同時，桑美外圍風場在台灣海峽北部受到地形管道效應影響，低層產生東北風噴流，而寶發外圍氣流在中央山脈南部附近出現繞山作用，在高屏近海產生低層東南風噴流，兩者造成風速風切，導致台灣西部近海處北側、南側分別生成一個氣旋式、反氣旋式渦漩，且與兩中尺度低壓疊合，使台灣海峽呈現鞍形氣流場分佈。模擬顯示MCL對流胞激發位置是兩渦漩之南北風輻合處，且較強的偏北風遇到較冷偏南風被迫抬起產生上衝流。此外，兩颱風為MCL持續提供一南一北對流不穩定與高可用位能之環境。成熟移動期因北風向中層延伸，隨高度向南傾斜之MCL的南側低層出現伴隨冷池的中尺度高壓，此與MCL往北移動有密切相關，亦使MCL由PS型轉為TS型。當動力、熱力作用明顯減弱時，MCL進入消散期。

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