1. Scientific Objectives and Required Facilities Socorro Medina, Robert Houze, and Stacy Brodzik TIMREX Planning Meeting, Tainan, Taiwan, 9 November 2007 Scientific Objectives –Investigate the vertical structure of precipitation over Taiwan’s terrain –Investigate the structure of the terrain-modified airflow Required Facilities: S-Pol and upper-air soundings Highly desired: Vertically-pointing precipitation radar

2. Results from previous field experiments (MAP and IMPROVE-2) to illustrate how S- Pol sectors of RHI scans were used to accomplish similar objectives

3. Medina et al. (2007) 3-hour mean S-Pol reflectivity (1400-1700 UTC 28 Nov 2001 ) Cross-barrier distribution of time-averaged reflectivity as a function of height Distance from the radar (km) Pacific Coastal R. Valley Cascades Oregon Cascades

4. Cross-barrier distribution of S-Pol reflectivity aloft as a function of time - Maximum reflectivity (between 3-10 km) Medina et al. (2007) Western Oregon terrain Terrain elevation (km) Time (UTC)  30 20 10 0 -10 dBZ -20 -30 Distance from radar (km) -150 -100 50 0 50 100 150 1.8 1.4 1.0 0.6 0.2 21 18 15 12 09 03 06 00 09 03 06 00 28 Nov 29 Nov Pacific Coastal R. Valley Cascades Oregon Cascades

5. PBL flow adjacent to the terrain and embedded convection (S-Pol data) Rotunno and Houze (2007) 07-10 UTC 20 Sep 1999 mean Radial velocity (m/s)  Low-level flow rising over terrain Reflectivity (dBZ)  Maximum echo on top 1 st peak of terrain Particle Type (frequency of occurrence)  Stratiform background punctuated by graupel S-Pol NNW Distance from the radar (km) Dry snow Graupel Wet snow Alps

6. Evaluation of terrain-modified PBL flows simulated by numerical mesoscale models 08-11 UTC 21 Oct 1999 mean Time-averaged observed radial velocity (m/s) (S-Pol) Time-averaged simulated radial velocity (m/s) (MESO-NH) S-Pol NW Distance from radar (km) Alps S-Pol NW Distance from radar (km) Alps

7. Vertically pointing radar data Reflectivity (dBZ)  Time Radial velocity (m/s) Houze and Medina (2005)

8. Other requirements Desk space for two people in the Operation Center (OPS) or for one person at the OPS and one person at the S-Pol site (depending on how much data can be transmitted from S-Pol to OPS) Internet access