[gradsusr] If Statements for Gridded Model Data Open GrADS

[Baker, Matt (Quebec - Atlantic)]

Hi all,

I have a question regarding Open GrADS.

I'm trying to use if statements for scalar model data (eg. GFS and NAM) over a grid and I'm wondering if it's possible to do this. As an example, I'm using if statements for these parameters: surface based CAPE, LI, and 500 mb relative humidity to create an index to plot on a map. So far GrADS isn't showing that this is working, however, I can plot the model data individually so I don't think it's a case of missing data.

Here's some of the code for the NAM model. Note that I define the variable NAMHail to equal 0 at the start of the function.

   if (modelNumberNAM>0)
        set_maps(_map,_hasNegativeNAM)
        'set grads off'
        'set grid off'
        'set gxout contour'
        'set ccolor 0'
        'set clopts -1 1 0.15'
        'set cint 1'
        'set cthick 6'
        'set clab on'
        'set csmooth on'

        'NAMcape = CAPEsfc.'modelNumberNAM
        if (NAMcape > 1500 & NAMcape < 2200)
            'NAMHail = NAMHail + 1'
        endif
        if (NAMcape > 2199 & NAMcape < 3100)
            'NAMHail = NAMHail + 2'
        endif
        if (NAMcape > 3099)
            'NAMHail = NAMHail + 3'
        endif

        'set lev 500'
        'NAMrh500=RHprs.'modelNumberNAM
        if (NAMrh500 < 35)
            'NAMHail = NAMHail + 3'
        endif
        if (NAMrh500 > 35 & NAMrh500 < 44)
            'NAMHail = NAMHail + 1'
        endif

    endif

    'set gxout contour'
    'set ccolor 0'
    'set clopts -1 1 0.15'
    'set cint 200'
    'set cthick 6'
    'set clab on'
    'set csmooth on'

    'd NAMcape'

Thanks!

Matt Baker
Meteorologist, Met-Ocean Services, Amec Foster Wheeler Environment & Infrastructure
133 Crosbie Road, PO Box 13216, St. John's, NL A1B 4A5, Canada
matt.baker at amecfw.com<mailto:matt.baker at amecfw.com>      amecfw.com
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