Author: Conor Sweeney

  • WRF with MERRA2

    WRF required fields: 3D, pressure levels: Temperature=T, Winds=U, V, Relative Humidity=RH, Geopotential Height=PHIS 2D: Surface Pressure=PS, Sea Level Pressure=SLP, Skin Temperature=TS, 2-meter Temperature=T2M, 2-meter specific humidity=QV2M, 10-meter U,V=U10M,V10M Constant: LANDSEA mask=FRLAND, Soil Height, PHIS Optional: Soil Temperature and Soil Moisture, needed for Noah LSM. Water equivalent snow depth=PRECSNOLAND. Area I download for GFS forecasts: leftlon=-55, rightlon=20, toplat=70, bottomlat=30 MERRA2 Data […]

  • WRF on ORR2 with Intel compilers

    Orr2 is the HPC cluster of the UCD School of Mathematics and Statistics. ORR2 architecture Orr2 consists of 20 compute nodes on the following queues (‘qstat -f’ will show all queues): 2×64.q compute-0-0.local, compute-0-1.local 2 nodes with 64-cores: AMD Bulldozer/Opteron. 2.1GHz, 128GB. 68nht.q compute-1-0.local 1 node with 12 cores: Intel Nehalem. 2.66GHz, 24GB, Infiniband compute-1-1.local – compute-1-7.local […]

  • Dealing with GRIB2 data

    We use python for our data analysis and plotting. The wonderful xarray package ( has no problem with NetCDF, but doesn’t like GRIB2. GFS data are in GRIB2, however, so it would be nicve if we could convert them easily to NetCDF. We can do this by using the great wgrib2 tool ( To install […]

  • Download GFS forecast

    We would like to run WRF forecasts driven by global forecast data from NOAA’s Global Forecast System (GFS: To download a subset of the GFS data use NOMADS g2subs: Select the “grib filter” link for the dataset you want. Use “make subregion”: e.g. lon:-55 to 25, lat: 25 to 70 Don’t use the analysis […]