<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">I have only one thing to add, and that is to be careful about accumulation periods. For the GFS 3-hourly data, the files at hour 03, 09, 15, and 21 are all 3hr accumulations, but hours 00, 06, 12, and 18 are 6-hour accumulations. If you have a 3-hourly time series, you should use the optional tinc argument in the call to sum, e.g.:<div><br></div><div>ga-&gt; d sum(p,t=1,t=81,2)</div><div><br><div>—Jennifer</div><div><br><div><div>On Aug 5, 2015, at 6:21 AM, Brian Gaze &lt;<a href="mailto:brian.gaze@NTLWORLD.COM">brian.gaze@NTLWORLD.COM</a>&gt; wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr">Perfect. Thanks Jim.<br><div class="gmail_extra"><br><div class="gmail_quote">On 4 August 2015 at 20:45, James T. Potemra <span dir="ltr">&lt;<a href="mailto:jimp@hawaii.edu" target="_blank">jimp@hawaii.edu</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
  
    
  
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    Hi Brian,<br>
    <br>
    Sorry, yeah you'll have to concatenate the files together.&nbsp; But, you
    can do that with the template option in grads.&nbsp; An explanation is
    given at <a href="http://www.iges.org/grads/gadoc/templates.html" target="_blank">http://www.iges.org/grads/gadoc/templates.html</a>.<br>
    <br>
    Jim<div><div class="h5"><br>
    <br>
    <div>On 8/3/15 8:29 PM, Brian Gaze wrote:<br>
    </div>
    <blockquote type="cite">
      <div dir="ltr">
        <div>Thanks Jim.</div>
        <div><br>
        </div>
        <div>Understand the function, but to use does it require me to
          first concatenate the individual grib2 files together for each
          time step required?</div>
        <div><br>
        </div>
        <div>Brian</div>
        <div><br>
        </div>
        <br>
        <div class="gmail_extra"><br>
          <div class="gmail_quote">On 4 August 2015 at 02:59, James T.
            Potemra <span dir="ltr">&lt;<a href="mailto:jimp@hawaii.edu" target="_blank">jimp@hawaii.edu</a>&gt;</span>
            wrote:<br>
            <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
              <div bgcolor="#FFFFFF" text="#000000"> Hi Brian,<br>
                <br>
                You should be able to use the GrADS function "sum",
                e.g., 'd sum(precip,t=1,t=384)'.<br>
                <br>
                Jim
                <div>
                  <div><br>
                    <br>
                    <div>On 8/3/15 10:46 AM, Brian Gaze wrote:<br>
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                        <div>Hi,</div>
                        <div><br>
                        </div>
                        I'd like to be able to plot a chart using
                        shading and contours for a lat long range
                        (rather than single point) which displays the
                        total accumulated precipitation for a series of
                        time steps rather than each individual one in
                        the GFS run. For example, total precipitation
                        for 0 to 384 hours, lat 30 to 60, lon -45 -60.&nbsp;
                        <div><br>
                        </div>
                        <div>The GFS grib2 files don't seem to contain a
                          variable with this data so I'm guessing it's
                          necessary to sum precipitation values from
                          each individual file? Any suggestions for the
                          best way to go about this?</div>
                        <div><br>
                        </div>
                        <div>Thanks</div>
                        <div><br>
                        </div>
                        <div>BWG</div>
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<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;  "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div>--</div><div>Jennifer M. Adams<br>Center for Ocean-Land-Atmosphere Studies (COLA)<br>111 Research Hall, Mail Stop 2B3<br>George Mason University<br>4400 University Drive<br>Fairfax, VA 22030&nbsp;<br><br></div><div><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span></span><br class="Apple-interchange-newline">
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