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About us...


ATMET is a new, start-up company formed in August 2001 by Drs. Tremback, Walko, and Avissar to further the transfer of meteorological and environmental technology (both hardware and software systems) into the environmental assessment and operational forecasting arenas. ATMET offices are located in Boulder, Colorado. ATMET serves as a prime and sub-contractor in operational forecasting, air quality and meteorologically-related modeling programs. This involves the application of state-of-the-art mesoscale numerical models and high performance workstations and computer clusters to environmental assessment and forecasting.

ATMET personnel have a long history of experience in atmospheric numerical modeling and research, along with use of numerical models to a wide range of applications. From the beginning of RAMS at Colorado State University to the applications at *ASTeR, Inc. to the applied forecasting at Mission Research Corporation, ATMET personnel were the main driving force behind the development of the primary software and hardware systems for RAMS. ATMET personnel also have many years of experience with other modeling suystems, including the PSU/NCAR MM5 model.

ATMET personnel include the primary developers of RAMS (the Regional Atmospheric Modeling System), developed over the past two decades, mostly at Colorado State University and Mission Research Corporation. RAMS is a state-of-the-art mesoscale modeling system with applications in atmospheric reserach, high-resolution weather forecasting, photochemical ozone modeling and precursor transport, air quality studies, acid deposition, long range transport, nuclear emergency response, and environmental and atmospheric research. RAMS can drive advanced Lagrangian particle and Eulerian dispersion models which predict mesoscale pollution impacts in complex, time-dependent, mesoscale circulations. Worldwide there are over 140 sites running RAMS. ATMET personnel also work cooperatively with various consulting and computer firms to interface its software systems with sophisticated photochemical models and visualization codes.

Along with RAMS, ATMET staff has experience in running several of the atmospheric numerical simulation models and analysis packages that are in use today. These systems include the PSU/NCAR MM5 system, the NOAA/FSL LAPS and MAPS systems, the NCAR/RAP ATEC RT-FDDA system, and the MESO MASS modeling system. ATMET personnel have many years of experience in the development, testing, and implementation of all of these systems.


ATMET staff members pioneered the use of mesoscale numerical prediction models for applied atmospheric research, air quality assessment and operational weather forecasting in studies for various governmental agencies, the nuclear power industry, electrical utilities, and oil companies. ATMET principals are experienced in mesoscale atmospheric modeling, operational weather forecasting and air pollution transport and diffusion simulation. Areas of expertise include mesoscale numerical modeling, emergency response, air pollution modeling, general air pollution meteorology, planetary boundary layer physics, mesoscale transport and diffusion, complex terrain and coastal meteorology, computer systems, computer programming, computer graphics, remote sensing applications, mesoscale data acquisition and analysis, data base management, synoptic and mesoscale forecasting and field program logistics and management. Company principals have over 70 years of combined professional experience. The following is a list of the principals and their specialties:

Craig J. Tremback, Ph.D - Senior Scientist and President;   RAMS model co-designer; mesoscale systems, operational forecasting, software systems, air pollution processes.

Robert L. Walko, Ph.D - Senior Scientist and Vice-President;  RAMS model co-designer, coding and maintenance, Lagrangian particle modeling, surface and boundary layer dynamics.

Roni Avissar, Ph.D - Senior Scientist and Vice-President; Convective storm dynamics and parameterization; surface and PBL parameterizations; numerical model evaluation techniques.


ATMET has a number of computing platforms at its disposal to perform the significant computational work required by sophisticated atmospheric models and the visualization of their output. These include:

  • Athlon cluster I - Beowulf cluster consisting of 7 dual processor Athlon 1600+ machines clustered as a distributed-memory parallel system. 14 total processors with 4 Gb total central memory and 280 Gb total disk.
  • Athlon cluster II - Beowulf cluster consisting of 6 dual processor Athlon 2000+ machines clustered as a distributed-memory parallel system. 12 total processors with 4.5 Gb total central memory and 400 Gb total disk.
  • Pentium-based PC - numerous Pentium III and Pentium IV-based personal computers running LINUX and Windows 2000/XP.