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Re: description of NAM

Hi Becky,

Thanks for the clarification.


On 12/5/2011 8:15 PM, Rebecca Cosgrove wrote:
> Hi all.
> Just wanted to throw in my 2 cents...  Tom and I have talked about the
> NAM nests, but till we get CONDUIT upgraded and can increase the LDM
> queue, it's just too much data.  So in the spring we can talk about this
> addition.
> Becky
> On 12/5/2011 3:23 PM, Ethan Davis wrote:
>> Hi Geoff,
>> No, no buses. Thanks for the info.
>> Yes, the Best Time Series does seem to be a popular view of the data.
>> Once we start getting the data, we'll make it available as Best Time
>> Series.
>> Thanks,
>> Ethan
>> On 12/5/2011 12:04 PM, Geoff DiMego wrote:
>>> OK that is probably correct and I am jumping the gun.  We wanted FWIS to
>>> go onto CONDUIT first to get the IMET folks started making the
>>> connections to/thru FXNET.  This would mean the other 4 fixed location
>>> nests would have to come later.  I hope I didn't throw anybody under the
>>> proverbial bus.
>>> That said, I do think what Rich would be able to use most often are Best
>>> Time Series from the nests which are fixed and provide guidance out to
>>> 60 hours.
>>> On 12/5/2011 1:13 PM, Ethan Davis wrote:
>>>> Hi Geoff,
>>>> Right. Sorry, I missed that detail and jumped right to FWIS for some
>>>> reason.
>>>> We aren't getting the new NAM nest data (4km CONUS, 6km AK, etc.) on
>>>> our
>>>> server. I checked with Tom Yoksas and he said it isn't on CONDUIT yet.
>>>> Linda, do you know the status of that data for CONDUIT? Becky
>>>> Cosgrove's
>>>> presentation to the User Committee mentions that data on a "Recent
>>>> Model
>>>> Additions" slide but I don't recall the details.
>>>> Thanks,
>>>> Ethan
>>>> On 12/2/2011 12:37 PM, Geoff DiMego wrote:
>>>>> Ethan - thanks for doing the update on NAM documentation.
>>>>> I think what Rich was asking for are Best Time Series for the fixed
>>>>> domain NAM nests, not the FWIS which as you say can be and often
>>>>> are in
>>>>> different places each run.
>>>>> On 12/1/2011 4:06 PM, Ethan Davis wrote:
>>>>>> Hi Geoff,
>>>>>> I've made the documentation changes you requested to the underlying
>>>>>> files. I will push them out to our server shortly.
>>>>>> The "Best Time Series" aggregation is generated by our FMRC (Forecast
>>>>>> Model Run Collection) aggregation. The FMRC takes a time series of
>>>>>> runs
>>>>>> from a given model and creates several virtual aggregated datasets
>>>>>> including a 2 time dimension, 5-D dataset and several datasets with a
>>>>>> single time dimension. This AGU poster describes the different single
>>>>>> time dimension datasets
>>>>>> http://www.unidata.ucar.edu/staff/caron/presentations/FmrcPoster.pdf
>>>>>> For all the NCEP model data we serve
>>>>>> (http://motherlode.ucar.edu:8080/thredds/idd/models.html ), the
>>>>>> underlying data is the GRIB data we get from NOAAPORT and CONDUIT. We
>>>>>> read from those data files (for which we have built indexes) to
>>>>>> satisfy
>>>>>> requests for data from the virtual datasets.
>>>>>> Since the spatial domain of the FWIS can change for each run, we
>>>>>> won't
>>>>>> be able to do a full FMRC aggregation. Each FMRC aggregation expects
>>>>>> all
>>>>>> the data for each run of the model to be on the same grid. So, we can
>>>>>> serve the data from each FWIS run on its own. But we'll have to think
>>>>>> about what else it makes sense to do, e.g., "Best Time Series". I'll
>>>>>> touch base with Rich and ask what he is trying to do with the
>>>>>> data, how
>>>>>> he would like to access it.
>>>>>> Geoff, can you explain how the location of each FWIS run is
>>>>>> determined?
>>>>>> Is it an automated process? Or does someone/group decide? Also, are
>>>>>> there times when the location stays the same across runs? Is the
>>>>>> information on the domain for each run available somewhere besides
>>>>>> the
>>>>>> grid description in the resulting GRIB files?
>>>>>> Thanks,
>>>>>> Ethan
>>>>>> On 12/1/2011 7:51 AM, Linda Miller wrote:
>>>>>>> Hi Geoff,
>>>>>>> Comments inline below.
>>>>>>> On 12/1/2011 7:31 AM, Geoff DiMego wrote:
>>>>>>>> Linda;
>>>>>>>> Hope all is going well for you and yours especially now that the
>>>>>>>> hectic holiday season is upon us ^_^
>>>>>>>> I hate to be a bother, but I have a favor (yes ANOTHER one!) and a
>>>>>>>> question to ask.
>>>>>>> No apologies needed
>>>>>>>> A USGS user had asked me whether we would be making "Best Time
>>>>>>>> Series"
>>>>>>>> aggregations for the new NAM nests (4 km CONUS, 6 km Alaska, 3 km
>>>>>>>> Hawaii&    3 km Puerto Rico-Hispaniola).  I pleaded ignorance.  He
>>>>>>>> pointed me at
>>>>>>>> http://motherlode.ucar.edu:8080/thredds/catalog/fmrc/NCEP/NAM/CONUS_12km/catalog.html?dataset=fmrc/NCEP/NAM/CONUS_12km/NCEP-NAM-CONUS_12km-noaaport_best.ncd
>>>>>>>> which I admit I was unaware of - my bad, but I recognize the
>>>>>>>> unique&
>>>>>>>> useful aspect of this product which you are constructing.
>>>>>>> If  you ever get to Boulder, you should plan to visit Unidata.  We
>>>>>>> could
>>>>>>> bring you up to speed with what;s going  on here.  You might find
>>>>>>> some
>>>>>>> of the projects of interest to NCEP.
>>>>>>>> The favor is to update the 3rd Summary bullet under
>>>>>>>> Documentation to:
>>>>>>>> NCEP Nonhydrostatic Multiscale Model on B-grid (NMMB) running in
>>>>>>>> the
>>>>>>>> NOAA Environmental Modeling System (NEMS) infrastructure, and
>>>>>>>> Gridpoint Statistical Interpolation (GSI) analysis.  You could also
>>>>>>>> add a bullet called NCEP Analysis documentaton / tutorial and
>>>>>>>> link it
>>>>>>>> to http://www.dtcenter.org/com-GSI/users/tutorials/11_2.php .
>>>>>>> I'm sure we can do that.  I've cc'd Doug Dirks and Ethan Davis
>>>>>>> who can
>>>>>>> check it out and make the appropriate edits.
>>>>>>>> My question comes from the one the USGS guy asked: are you
>>>>>>>> planning to
>>>>>>>> aggregate Best Time Series for the new NAM nests?
>>>>>>> I'll bet the "USGS guy" is Rich Signell, who is a liaison to our
>>>>>>> Users
>>>>>>> Committee.  He definitely keeps us on our toes.  I'll defer your
>>>>>>> question to Ethan.
>>>>>>> Hope  your holidays are joyful!
>>>>>>> Linda

Ethan Davis                                       UCAR Unidata Program
address@hidden                    http://www.unidata.ucar.edu

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