10.2 Preliminary results from the SoWMEX/TiMREX sounding network

Tuesday, 18 August 2009: 4:15 PM
The Canyons (Sheraton Salt Lake City Hotel)
Richard H. Johnson, Colorado State University, Fort Collins, CO; and P. E. Ciesielski, Z. Finch, and A. J. Newman

During SoWMEX/TiMREX, an enhanced sounding network, including both operational and supplemental sites, was deployed over Taiwan Island and its vicinity. Sounding frequency ranged from 2-4 per day during undisturbed conditions up to 8 per day during intensive observation periods.

Preliminary results indicate that the sounding network was successful in capturing a variety of synoptic and mesoscale conditions leading to heavy rainfall and flash flooding over Taiwan. The individual cases ranged from isolated convection producing heavy rainfall (IOP-2), heavy rainfall in central Taiwan associated with the Meiyu Front and back-building convection (IOP-4), heavy rainfall over southern Taiwan associated with a mesovortex that had its origins over China (IOP-6), and heavy rainfall over southern Taiwan associated with southerly flow impinging on the island (IOP-8). Averaged over the entire experiment, the heaviest rainfall occurred over southern and upstream of the island. Preliminary diagnosed divergence and vertical motion are in general agreement with observed rainfall. A late afternoon/evening maximum in rainfall was found over land, a midday maximum over the ocean upstream of Taiwan. The above results are based on real-time data obtained during the field phase. Quality-control efforts on the sounding data are currently underway.

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