Abstract
Torrential rainfall processes associated with a landfall of Typhoon Bilis (2006) are investigated using a two-dimensional cloud-resolving model simulation. The model is integrated for 6 days with imposed zonally-uniform vertical velocity, zonal wind, horizontal temperature and vapor advection from NCEP/GDAS data. The simulation is validated with observations in terms of surface rain rate and reflectivity. The simulated stratiform clouds cover 89% of the simulation domain that leads to dominant stratiform rainfall on 15 July 2006. The convective clouds develop to cover 29% of the simulation domain that yields dominant convective rainfall whereas the stratiform clouds shrink to 46% on 16 July 2006. The domain-mean simulation shows that the increase of domain-mean surface rain rate from 15 to 16 July 2006 mainly results from local atmospheric moistening on 15 July and local atmospheric drying on 16 July although water vapor convergence rates in the two days are similar.
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