[gradsusr] Precipitation Output Files Changed from NOAA AHPS: Can't read in GrADS anoymore

James Spinks jspin881 at hotmail.com
Fri Jul 28 19:52:08 EDT 2017

Hi all,

NOAA AHPS changed their netcdf for format for the precipitation data as stated here: http://www.nws.noaa.gov/om/notification/scn17-32ahps_pcpnaaa.htm

will be available in the following formats:

  - Climate and Forecast (CF)-Network Common Data Form (netCDF)

Precipitation products will no longer be available in the following


  - netCDF not adhering to the netCDF CF metadata convention

I'm not exactly sure the difference of the two and how it effects grads. I previously had a .ctl file the would read the original netcdf file just fine:

DSET ^nws_precip_1day_20170728_conus.nc

dtype netcdf
title amountofprecip
undef -1
pdef 1051 813 nps 388 1591 -105.000000 4.7625
xdef 1500 linear -135 0.05
ydef 700 linear 20 0.05
zdef 1 linear 1 1
tdef 1 linear 00Z28Jul2017 1dy
vars 1
amountofprecip=>pcp  1 y,x amountofprecip

Now this ctl does not work nor does ncdump read the new file from http://water.weather.gov/precip/downloads/

Has anyone had any success opening the new updated precip data in GrADS from AHPS? If so, do you have a ctl file you could share?


James Spinks

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