MM5 model setup:
The 3D dynamic non-hydrostatic prognostic
meteorological model MM5
uses three nested domains to simulate mesoscale atmospheric dynamics
taking initial 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 over 58x58 grid cells. The two nested domains have 9 km resolution with 109x109
grid points and 3 km resolution with 76x76 grid points.
The final domain is identical to the model (CAMx) master domain, with a 1 km resolution
generated by MM5toCAMx:
|| grid size
|27 km || 58 x 58 || 1,566 km
|9 km || 109 x 109 || 981 km
|3 km || 76 x 76 ||228 km
Central coordinates for mother (largest) model domain are: 16.2 °E, 45.6 °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 26 h. First 2 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 (1 hour),
start time of simulation is at 21:00 UTC "today" and end time is at 24:00 UTC "tomorrow".
The first 2 hours are discarded.
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,
MM5 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 subdomain for GFS data downloaded for various project areas
The GFS forecast data are downloaded from the
NOAA Operational Model Archive Distribution System:
|latitude ||10°||N - || 60°||N
|longitude|| 0° || - 360°
- nomad1 = "http://nomad1.ncep.noaa.gov/cgi-bin/ftp2u_gfs.sh"
- nomad3 = "http://nomad3.ncep.noaa.gov/cgi-bin/ftp2u_gfs.sh"
- nomad5 = "http://nomad5.ncep.noaa.gov/cgi-bin/ftp2u_gfs.sh"
- nomad6 = "http://nomads6.ncdc.noaa.gov/cgi-bin/ftp2u_gfs.sh"