The CIMSS Regional Assimilation System (CRAS) numerical weather
prediction model was developed by the researchers of the Space Science
and Engineering Center (SSEC)
of the University of Wisconsin-Madison (Leslie
et al., 1985; Raymond et al., 1995; Raymond et al., 1998;
for more information please see http://cimss.ssec.wisc.edu/cras/index.html).
The DBCRAS forecast model is the Direct Broadcast version of CRAS,
which assimilates the MODIS total precipitable water vapor parameter
found within the mod07 HDF product (atmospheric profiles) and the
Cloud Top Pressure and Cloud Effective Emissivity parameters from
the mod06 HDF files (Cloud Product) to adjust the depiction of atmospheric
moisture and clouds in the initial model conditions taken from the
US NOAA National Center for Environmental Prediction (NCEP) Global
Forecast System (GFS) model (Aune et al.,
The forecast runs on a 48
km × 48 km horizontal resolution grid (covering ca. 10,000 km ×
6,500 km centered around Hungary), with 38 vertical levels, creating
outputs for 72 hours starting at every 00 and 12 UTC, using 3 hours
time steps. The initial conditions are determined by a 12 hours
long spin-up forecast, which utilizes the available MODIS data.
The outputs of the model are stored in grib2 format. The automatic
visualization is performed by McIDAS-X,
and GrADS software.
- Aune, B., Strabala, K.I., Lindstrom,
S., Huang, A., 2008. The Direct Broadcast Version of the CIMSS
Regional Assimilation System for Global Users. International EOS/NPP
Direct Readout Meeting 2008, March 31 - April 4, 2008, Bangkok,
- Aune, R.M., Strabala, K.I., Lindstrom, S.S. 2009. A mesoscale
prediction system for high latitudes that assimilates Direct Broadcast
MODIS. 10th Conference on Polar Meteorology and Oceanography (AMS).
2009. May 18-21, Wisconsin, USA. (http://ams.confex.com/ams/10POLAR/techprogram/paper_152870.htm)
- Leslie, L.M., Logan, L.W., Gauntlett, D.J., Kelly, G.A., McGreggor,
J.L., Manton, M.J., 1985. A high resolution primitive equation
NWP model for operations and research. Aust. Meteo. Mag., 33, 11-35.
- Raymond, W.H., Olsen, W.S., Callan, G., 1995. Diabatic
forcing and initialization with assimilation of cloud and rainwater
in a forecast model. Mon. Wea. Rev., 123, 366-382.
- Raymond, W.H., Aune, R.M., 1998. Improved precipitation
forecasts using parameterized feedbacks in a hydrostatic forecast
model. Mon. Wea. Rev., 126, 693-710.