MM5 model setup:
The 3D dynamic non-hydrostatic 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 high-resolution 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 Lambert-Conformal 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/cgi-bin/ftp2u_gfs.sh
- http://nomad5.ncep.noaa.gov/cgi-bin/ftp2u_gfs.sh
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