Rapid Refresh (RAP) and High-Resolution Rapid Refresh (HRRR) Forum
correction to RUC land-surface fields at 18z today
Posted By: Stan Benjamin
Date: 11-June-08 1452Z
A horizontal shift error of about ~3-4km in land-surface fields was found in the RUC. New, corrected fields are planned to be corrected in the operational RUC at 18z today. The fields to be corrected are: terrain elevation, vegetation type (including land-water mask), and soil type.
A comparison from southern Lake Michigan for 2m temps with old and new land-surface fields is available at:
ASCII versions of the new topo, vegtype, and soiltype fields are available at http://ruc.noaa.gov/fslparms/13km/jun08/. The current (pre-18z) corresponding fields are available in http://ruc.noaa.gov/fslparms/13km/.
The correction will improve the accuracy for RUC surface forecasts, especially near coastlines.
Thanks to Joe Koval at the Weather Channel for his role in drawing attention to this problem.
If you don't hear otherwise after 18z, you can conclude that this change went in.
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