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    If you are interested in doing WRF runs in an area near 40 degrees north latitude, what is the appropriate map projection to use?

    • Polar-stereographic
    • Lambert-Conformal
    • Mercator
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  • 2. 

    The ungrib program will process:

    • All variables and times found in the input GRIB data

    • Observational data

    • Both GRIB1 and GRIB2 data

    • All of the above

    Correct Answer
    A. Both GRIB1 and GRIB2 data
    Explanation
    The ungrib program will always process GRIB1 data, and as long as you compiled with an option that was not listed as 'NO GRIB2' then it will also process GRIB2 data. The program does not process observational data, and since it reads the &share section of the namelist, it will only process the dates/times listed in that section.

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  • 3. 

    The metgrid program performs which type of interpolation?

    • Horizontal interpolation of meteorological fields

    • Horizontal interpolation of static, geographical fields

    • Vertical interpolation of meteorological fields

    • Both (a) and (c)

    Correct Answer
    A. Horizontal interpolation of meteorological fields
    Explanation
    The metgrid program takes the meteorological data processed by ungrib and interpolates it to the WRF domain. The program will also "copy" static geographical data processed by geogrid to the output. Vertical interpolation is not performed until the real.exe program.

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  • 4. 

    Which of the following are true of the Vtables used by the ungrib program?

    • A Vtable must list all fields available in a GRIB data source

    • Vtables for different GRIB data sources are interchangeable

    • A Vtable must list all fields required by the WRF model

    • All of the above

    • None of the above

    Correct Answer
    A. A Vtable must list all fields required by the WRF model
    Explanation
    It is important for a Vtable to give GRIB codes for each source of meteorological field required by WRF. The WRF model does not usually need all the data in a GRIB file, but must have certain fields, and uses the Vtable to extract that data from the GRIB files. Each type of data uses different GRIB codes, and therefore there is a different Vtable written for each source type.

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  • 5. 

    The metgrid program will find the starting and ending dates to process from:

    • The start_date and end_date variables in the &share namelist record

    • The available intermediate files in the working directory

    • The available GRIB files in the working directory

    • None of the above

    Correct Answer
    A. The start_date and end_date variables in the &share namelist record
    Explanation
    The metgrid program reads the &share section of the namelist, which includes the start and end dates.

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  • 6. 

    What are the necessary output files from the real.exe program for a regional domain simulation?

    • No files are necessary for WRF

    • The initial condition file only: wrfinput_d01

    • The lateral boundary condition file only: wrfbdy_d01

    • Both the initial and lateral boundary condition files are required

    Correct Answer
    A. Both the initial and lateral boundary condition files are required
    Explanation
    The wrf.exe program must have both initial and boundary conditions in order to run, for a real-data case.

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  • 7. 

    The real.exe program does what type of interpolation?

    • No interpolation is done in real.exe

    • Horizontal interpolation only

    • Vertical interpolation only

    • Both horizontal and vertical interpolation

    Correct Answer
    A. Vertical interpolation only
    Explanation
    One of the primary functions of the real program is to take the horizontally-interpolated meteorological fields from WPS (met_em* files) and vertically interpolate them to WRF model levels (which are based on a terrain-following coordinate), prior to running wrf.exe.

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  • 8. 

    What is a recommended safe time step (in seconds) to use in the model?

    • Greater than 6 times grid distance in kilometers

    • Less than 3 times grid distance in kilometers

    • Between 4 and 6 times grid distance in kilometers

    Correct Answer
    A. Between 4 and 6 times grid distance in kilometers
    Explanation
    The suggested time step used for WRF runs is 6xDX; however, it may sometimes be necessary to reduce it to 4xDX to maintain stability in the model in real-data applications.

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  • 9. 

    If you needed to know the value to use for 'num_metgrid_levels' in the namelist.input file, in what file would you look to find it?

    • Wrfinput_d01

    • Met_em.d01.nc

    • Geo_em.d01.nc

    Correct Answer
    A. Met_em.d01.nc
    Explanation
    You can find the value for 'NUM_METGRID_LEVELS' by issuing the command: ncdump -h met_em.d01.nc and looking for that variable and its corresponding value.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Jan 17, 2018
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 21, 2016
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