MM5 model setup:
The 3D dynamic nonhydrostatic prognostic
meteorological model MM5
uses three nested domains to simulate mesoscale atmospheric dynamics
taking nitial and boundary conditions from the GFS Forecast model and generates
local highresolution data sets.
The largest domain has horizontal resolution of 27 km in both directions and
extents 58x58 grid points. The two nested domains have 9 km resolution with 82x82
grid points and 3 km resolution with 109x109 grid points.
The final domain is identical to the model (CAMx) master domain, with a 1 km resolution
generated by MM5toCAMx:
Central coordinates for mother (largest) model domain are: 127.7641°E, 37.7665°N
The projection used in MM5 computations is LambertConformal projection.
The MM5 model output is converted to a UTM grid after
the model run using MM5toCAMx postprocessing program.
Vertical resolution of the model domain consists of 17 levels plus surface (1000 mb).
The model has a high vertical resolution near the surface to
cover layering used by CAMx. The vertical levels are distributed as follows
(in mb): 1000, 997, 994, 988, 976, 940, 883, 850, 780,
700, 600, 500, 400, 300, 250, 200, 150, 100.
The computational time step for the largest domain is 81 s.
The timestepping increases by factor 3 for nested domains. Approximately 3 times
horizontal grid resolution in km. Model output frequency is 1 h.
Integration time of the model is 27 h. First 3 h of model simualtion are discarded as initial adjustment.
Therefore, data are imported and displayed for 24 h corresponding to local time 00:00 to 24:00 h.
The model setup takes into account the local time shift from UTC of 9 h.
Start time of forecast simulation is at 12:00 UTC "today" and
end time of forecast simulation is 15:00 UTC "tomorrow".
MM5 model uses following databases:
 MM5.MM5_scenario: information about MM5 setup
 AIRMATRIX: matrix results for temperature, wind field (precipitation, solar radiation,
cloud cover under development)
 MONITORING_TS: timeseries for temperature, wind speed, wind direction, pressure,
humidity, precipitation.
INPUT DATA:
MM5 forecast is based on results of NCEP GFS Forecasts data.
The GFS input data are available on resolution 1 °x1°
with time interval of 3 hours. Datasets used include surface pressure,
sea level pressure, geopotential height, temperature,
sea surface temperature, relative humidity, u and v wind vector components.
The GFS forecast data are downloaded from
NOAA Operational Model Archive Distribution System:
 http://nomad3.ncep.noaa.gov/cgibin/ftp2u_gfs.sh
 http://nomad5.ncep.noaa.gov/cgibin/ftp2u_gfs.sh

