<div dir="ltr">You can use APCPsfc-APCPsfc(t-1) to get the 3-hour precipitation. Note that you need to have downloaded the ACPCsfc GRIB file for the previous forecast hour as well in order to do this. You also need to generate a .ctl file that encompasses both GRIB files (personally I like to have it include all of the relevant files).<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Dec 12, 2015 at 8:53 AM, Chorley Weather <span dir="ltr"><<a href="mailto:weatherstu@chorleyweather.com" target="_blank">weatherstu@chorleyweather.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
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<p>Hi all,</p>
<p> </p>
<p>I am currently developing GEM charts (25km) and I see that function variable APCPsfc is actually accumulated precipitation. Is there a way to get single 3 hour precipitation rates without the accumulation. There is also a PRATE option but this seem to be full of undefined values. </p>
<p>Thank you in advance,</p><span class="HOEnZb"><font color="#888888">
<div>-- <br>
<p>Stuart Markham</p>
<p><img src="http://www.chorleyweather.com/forecast-charts/SampleDatasets/logo%20450x100.PNG" alt=""></p>
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