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Fwd: Re: location of 4km NAM nest gridded output



Hi,

Here's a follow on to the earlier message. I didn't send that one to Russ and John, but I will in a moment.

Thanks,
Linda

-------- Original Message --------
Subject: Re: location of 4km NAM nest gridded output
Date: Thu, 01 Dec 2011 11:04:55 -0500
From: Geoff DiMego <address@hidden>
To: Rich Signell <address@hidden>
CC: Ming Ji <address@hidden>, Hendrik Tolman <address@hidden>, Linda Miller <address@hidden>




Rich;

Those aggregations are actually constructed by UNIDATA.  You have to
understand that NCEP is almost exclusively a GRIB shop so most things
NetCDF come from outside of NCEP.  I'm checking with Linda Miller to see
if UNIDATA are planning to do nest aggregations or not.  You could also
contact them if you would like to see the NAM nests added.


On 11/30/2011 1:18 PM, Rich Signell wrote:
 Geoff,

 I'm taking about creating a "best time series" aggregation of the
 forecast data, like this one for the NAM 12 km data that Unidata has
 on their THREDDS Data Server (they get the feed from noaaport)

 
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

 If you look at the NetCDF subset service:
 
http://motherlode.ucar.edu:8080/thredds/ncss/grid/fmrc/NCEP/NAM/CONUS_12km/NCEP-NAM-CONUS_12km-noaaport_best.ncd/dataset.html

 You can see that the last 45 days + forecast are available as a single
 time series that is constructed from the "best" data of each forecast,
 which is often what people want.  What this means for NAM is that when
 the latest forecast comes in, the forecast data from the previous
 forecast get "replaced" with the latest forecast data, so that only
 the 0-6 hour forecast data from older forecasts ends up becoming part
 of the best time series.

 -Rich

On Wed, Nov 30, 2011 at 10:15 AM, Geoff DiMego<address@hidden> wrote:
 Rich - glad you got what you were looking for.  I'm afraid I don't know what
 you mean by 'best time series' aggregations.  I'm assuming it can come from
 the Thredds Data Server which is getting done outside my branch.

 We do have output at selected sites (see
 http://www.emc.ncep.noaa.gov/mmb/nammeteograms/ ) where hourly output is put
 together in a time-series way, but these points aren't going to give you the
 kind of coverage that a grid would and our output grids are available every
 hour now so the so-called bufr-soundings are probably not what you want or
 need.

 Let me know if you need anything else.


On 11/30/2011 9:29 AM, Rich Signell wrote:

Geoff,

 Excellent.  Using the OPeNDAP GDS link, I was able to extract the 10m
 winds for the Gulf of Maine I wanted (see attached wind speed w/ every
 other vector plotted).
 It would great if there were "best time series" aggregations also --
 hopefully we'll get those when you get your Thredds Data Server going!

 Thanks,
 Rich


On Wed, Nov 30, 2011 at 8:29 AM, Geoff DiMego<address@hidden> wrote:

Rich;

 The NOMADS site is here: http://nomads.ncep.noaa.gov/index.shtml

 just scroll down and click on the grib filter or http (if you know or
 want
 openDAP, click that one) button next to NAM NEST CONUS.

 Note while the main NOMADS page says under "6 hours" in the "freq"
 column,
 these forecast grids are available every hour through 36 hr and every 3
 hr
 after that to 60 hr.










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