Rapid Refresh (RAP) and High-Resolution Rapid Refresh (HRRR) Forum
Surface shortwave radiation data
Posted By: Will Hobbs
Date: 7-March-14 0113Z
I am trying to get a feel for using RAP for solar energy forecasting, and am having some issues with Downward Short-Wave Rad. Flux (DSWRF) values using the 13km CONUS data. I can get reasonable looking data from the 32km NOAMHI GRIB2 files, but there seems to be something wrong with what I get from the 13km files.
A sample of the 32km radiation data is here:
and a sample of the 13km radiation data is here:
The radiation values I am getting out of the 13km file fluctuate between -1500 and +1500 in a “wave” pattern.
I'm pretty confident I am handling the GRIB2 files correctly, because I have no problem with srface temperature data:
13km temperature: http://s772.photobucket.com/albums/yy7/sirwilliamjr/?action=view¤t=13_temp_zps9d2a9abc.png
32km temperature: http://s772.photobucket.com/albums/yy7/sirwilliamjr/?action=view¤t=32_temp_zps8e5da229.png
For reference, I am getting my GRIB2 files from the NCEP FTP server.
Is there something I am clearly doing wrong? Also, are there any references in the shortwave radiation data? For example, this page does not cover radiation: http://ruc.noaa.gov/rr/RAP_var_diagnosis.html, and I can't find anything on the difference between downward and incoming shortwave radiation listed here: http://rapidrefresh.noaa.gov/RAP/.
Thanks to anyone that might be able to help.
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