[gradsusr] GFS total accumulated precipitation

[Joey Woodson]

Yup... I had quite a bit of "fun" setting up my total precip scripts,
especially with the NAM (which actually has different standards for the
precip data depending on which run of the day it is).

Joey
InstantWeatherMaps.com

On Mon, Aug 17, 2015 at 10:10 AM, Jennifer Adams <jma at cola.iges.org> wrote:

> 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.:
>
> ga-> d sum(p,t=1,t=81,2)
>
> —Jennifer
>
> On Aug 5, 2015, at 6:21 AM, Brian Gaze <brian.gaze at NTLWORLD.COM> wrote:
>
> Perfect. Thanks Jim.
>
> On 4 August 2015 at 20:45, James T. Potemra <jimp at hawaii.edu> wrote:
>
>> Hi Brian,
>>
>> Sorry, yeah you'll have to concatenate the files together.  But, you can
>> do that with the template option in grads.  An explanation is given at
>> http://www.iges.org/grads/gadoc/templates.html.
>>
>> Jim
>>
>>
>> On 8/3/15 8:29 PM, Brian Gaze wrote:
>>
>> Thanks Jim.
>>
>> Understand the function, but to use does it require me to first
>> concatenate the individual grib2 files together for each time step required?
>>
>> Brian
>>
>>
>>
>> On 4 August 2015 at 02:59, James T. Potemra <jimp at hawaii.edu> wrote:
>>
>>> Hi Brian,
>>>
>>> You should be able to use the GrADS function "sum", e.g., 'd
>>> sum(precip,t=1,t=384)'.
>>>
>>> Jim
>>>
>>>
>>> On 8/3/15 10:46 AM, Brian Gaze wrote:
>>>
>>> Hi,
>>>
>>> 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.
>>>
>>> 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?
>>>
>>> Thanks
>>>
>>> BWG
>>>
>>>
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>>
>>
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> --
> Jennifer M. Adams
> Center for Ocean-Land-Atmosphere Studies (COLA)
> 111 Research Hall, Mail Stop 2B3
> George Mason University
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