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1. visualise a Geographic View icon that's been set to the desired area (or global if desired)
2. drop the GRIB icon with a Contouring icon together into the plot window (plus any other icons required, e.g. Coastlines)

Now the data will be plotted just once, and only on the smaller area (if selected).

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For plotting larger areas (say, Europe or the whole globe), it can be best to switch to cell shading for a faster plot. For small areas (e.g. the size of a small country), grid shading will give the most accurate results, but this can be slower for larger areas.

MCONT,
    LEGEND     = ON,
    CONTOUR    = OFF,
    CONTOUR_MAX_LEVEL = 1.01,
    CONTOUR_SHADE_MAX_LEVEL = 1.01,
    CONTOUR_SHADE = ON,
    CONTOUR_SHADE_TECHNIQUE = CELL_SHADING,
    CONTOUR_SHADE_CELL_RESOLUTION = 50,
    CONTOUR_SHADE_MAX_LEVEL_COLOUR = KELLY_GREEN,
    CONTOUR_SHADE_MIN_LEVEL_COLOUR = 'RGB(0.95,0.97,0.98)',
    CONTOUR_SHADE_COLOUR_DIRECTION = CLOCKWISE

MCONT,
    LEGEND     = ON,
    CONTOUR    = OFF,
    CONTOUR_MIN_LEVEL = 0.0001,
    CONTOUR_SHADE_MIN_LEVEL = 0.0001,
    CONTOUR_SHADE = ON,
    CONTOUR_SHADE_TECHNIQUE = GRID_SHADING,
    CONTOUR_SHADE_MAX_LEVEL_COLOUR = KELLY_GREEN,
    CONTOUR_SHADE_MIN_LEVEL_COLOUR = 'RGB(0.95,0.97,0.98)',
    CONTOUR_SHADE_COLOUR_DIRECTION = CLOCKWISE

Keep an eye on memory usage

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The memory used during an on-screen interactive plot is released when the window is closed. But if you plot to a file (e.g. PNG, PDF, PS) the memory will not be released and you may have to kill the uPlotBatch process in order to release it.

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