orography plays a substantial role in the formation and evolution of many atmospheric phenomena. observations indicate that two mountain ranges to the southwest of the red sea and west of iran (zagross mountain range) play a crucial role in the formation, evolution and activities of synoptic weather systems over iran. observations also, indicate that there are considerable differences between t...

This paper describes the meteorological processes responsible for the mean transport of air pollutants during the ENSO-related forest fires in Kalimantan, Indonesia from 00 UTC 21 September to 00 UTC 25 September, 1997. The Fifth Generation of the Pennsylvania State University-National Center for Atmospheric Research (PSU-NCAR) Mesoscale Model (MM5) is used to simulate three-dimensional winds a...

The dynamics of moist orographic flows during the January 1997 floods in northern and central California are investigated using numerical simulations computed with the fifth-generation Pennsylvania State University–National Center for Atmospheric Research (PSU–NCAR) Mesoscale Model (MM5). Early in the event (31 December 1996–1 January 1997), the low-level winds offshore of California’s central ...

This paper describes the second part of a study to document the sensitivity of the modeled regional moisture flux patterns and hydrometeorological response of the North American monsoon system (NAMS) to convective parameterization. Use of the convective parameterization schemes of Betts–Miller–Janjic, Kain–Fritsch, and Grell was investigated during the initial phase of the 1999 NAMS using versi...

In this study a non-hydrostatic version of Penn State University (PSU) – National Center for Atmospheric Research (NCAR) mesoscale model is used to simulate the super cyclonic storm that crossed Orissa coast on 29 October 1999. The model is integrated up to 123 h for producing 5-day forecast of the storm. Several important fields including sea level pressure, horizontal wind and rainfall are co...

1. INTRODUCTION Parallel computing promises signiicant improvements in both the raw speed and cost performance of mesoscale atmospheric models. On distributed-memory massively parallel computers available today, the performance of a mesoscale model will exceed that of conventional supercom-puters; on the teraaops machines expected within the next ve years, performance will increase by several o...

A thorough understanding of the dynamics of cirrus cloud formation is needed in order to parameterize these clouds accurately in numerical models. The scales at which cirrus clouds develop affect their treatment within the coarse resolution climate models, which typically have grid-point separations on The model used for this experiment is the non-hydrostatic verthe order of 200 km. There is a ...

(A) Numerical Modeling: To answer the first question, we perform realistic numerical simulations of the environment of a land-based tropical disturbance (an AEW comprised of an MCC and an MV) in the vicinity of the EH. The disturbance is a precursor to the eventual genesis of Hurricane Alberto of 2000 (Hill and Lin 2003). We use the COAMPS® model, provided by the Marine Meteorological Division ...