[gradsusr] GrADS help with NOMADS server

[Mark Sponsler]

Hi all,
The Dods server started having issues with the 18z run of the models on Tues 6/1.

I talked to the help desk Wed afternoon and they determined it was part of a broader issue they were having with other servers.

The issue was resolved in the evening and my scripts received  valid data and ran fine with data from the 06z run of the models on Thurs 6/3.

So I think the issue is resolved. 
Mark

On June 3, 2021 7:45:31 AM PDT, Jeff Chabot <jsc219 at gmail.com> wrote:
>Hi Wesley,
>
>I have emailed the nomads help desk.  Once I hear back from them, I
>will
>let you know.
>
>Thanks,
>
>Jeff
>
>On Thu, Jun 3, 2021 at 8:10 AM Wesley Ebisuzaki - NOAA Federal <
>wesley.ebisuzaki at noaa.gov> wrote:
>
>> Jeff,
>>
>> I get the same error when trying
>>
>>     sdfopen
>> https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210603/gfs_0p25_00z
>>
>> from grads.  When I open
>>
>>   
>https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210603/gfs_0p25_00z
>>
>> from the browser,  I get
>>
>> GrADS Data Server - info for /gfs_0p25/gfs20210603/gfs_0p25_00z : dds
>>
><http://nomads.ncep.noaa.gov:80/dods/gfs_0p25/gfs20210603/gfs_0p25_00z.dds>
>>   das
>>
><http://nomads.ncep.noaa.gov:80/dods/gfs_0p25/gfs20210603/gfs_0p25_00z.das>
>> ------------------------------
>>
>> *OPeNDAP/DODS Data URL:*
>> http://nomads.ncep.noaa.gov:80/dods/gfs_0p25/gfs20210603/gfs_0p25_00z
>> *Description:*
>> GFS 0.25 deg starting from 00Z03jun2021, downloaded Jun 03 04:38 UTC
>> *Documentation:* (none provided)
>> *Longitude:*
>> 0.00000000000°E to 359.75000000000°E
>>  (1440 points, avg. res. 0.25°)
>> *Latitude:*
>> -90.00000000000°N to 90.00000000000°N
>>  (721 points, avg. res. 0.25°)
>> *Altitude:*
>> 1000.00000000000 to 0.01000000000
>>  (41 points, avg. res. 25.0)
>> *Time:*
>> 00Z03JUN2021 to 00Z13JUN2021
>>  (81 points, avg. res. 0.125 days)
>> *Variables:*
>> *(total of 215)*
>> ...
>>
>> This shows that (1) the file is available, and (2) I am not being
>blocked
>> by the server.
>> The EMC person who would look at this problem has retired, so you
>should
>> ask
>> the nomads help desk.
>>
>>   https://nomads.ncep.noaa.gov/txt_descriptions/Help_Desk_doc.shtml
>>
>> Wesley
>>
>>
>> On Thu, Jun 3, 2021 at 4:09 AM M.Mahakur <mmahakur at tropmet.res.in>
>wrote:
>>
>>> Probably file(s) not available.
>>> Error.."nc_open failed to open file ...."!
>>>
>>> ------------------------------
>>> *From: *"Jeff Chabot" <jsc219 at gmail.com>
>>> *To: *"GrADS Users Forum" <gradsusr at gradsusr.org>
>>> *Sent: *Thursday, June 3, 2021 11:56:52 AM
>>> *Subject: *[gradsusr] GrADS help with NOMADS server
>>>
>>> I am running into two GrADS issues using sdfopen and NOMADS from
>NCEP.
>>>
>>> Issue 1:
>>>
>>> I am using GrADS to run some models for my website and just recently
>I
>>> have been running into this error:
>>>
>>> syntax error, unexpected WORD_STRING, expecting WORD_WORD
>>> context: Error { code = 0; message =
>>> "/gfs_0p25/gfs20210603/gfs_0p25_00z is not an available dataset"^;};
>>>
>>> I am using the following sdfopen command:
>>>
>>> sdfopen
>>> https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210603/gfs_0p25_00z
>>>
>>> I have been using that format for years, but just the past few days
>I
>>> have been receiving these errors.
>>>
>>> Issue 2:
>>>
>>> I believe that I am hitting the 120 connections limit despite adding
>>> code to adjust for this limit:
>>>
>>> I am now getting this error after defining one variable:
>>>
>>> define precip = apcpsfc/25.4
>>>
>>> gancgrid error: nc_get_vara_double failed; NetCDF: Malformed or
>>> inaccessible DAP DATADDS
>>> Data Request Error:  Error for variable 'apcpsfc'
>>>   Error ocurred at column 1
>>> DEFINE error:  Invalid expression.
>>> gancgrid error: nc_get_vara_double failed; NetCDF: Malformed or
>>> inaccessible DAP DATADDS
>>> Data Request Error:  Error for variable 'apcpsfc'
>>>   Error ocurred at column 1
>>> DEFINE error:  Invalid expression.
>>>
>>> I added a 60 second sleep command between variables to account for
>>> your April 20th changes and things worked for a while, and now the
>>> above error has returned.
>>>
>>> GrADS code added:
>>> say 'Sleep for 60 secs to Prevent Hitting 120 connection limit'
>>> '!sleep 60'
>>> say 'Continue Processing'
>>>
>>> Any ideas or suggestions on these issues?  I had things working
>after
>>> the April 20 NOMADS change, but since June, I have had these errors
>>> and my code has stopped working.
>>>
>>> P.S. Does anyone have sample code to check to see if sdfopen or
>define
>>> commands will work and if not tell GrADS to quit so it doesn't waste
>>> time creating blank maps?
>>>
>>> Thanks again,
>>>
>>>
>>> Jeff
>>> _______________________________________________
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>>> gradsusr at gradsusr.org
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-- 
Thanks 
Mark Sponsler
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