Rapid Refresh (RAP) and High-Resolution Rapid Refresh (HRRR) Forum
15z change - NCEP-RUC to sigma pressure thickness
Posted By: Stan Benjamin
Date: 17-November-10 1719Z
A change was made to the operational-NCEP RUC today at 15z to the maximum sigma pressure thickness in the RUC today, changing it from 10 hPa to 15 hPa. This reverses a change made to the NCEP RUC in March-April 2010. The change today makes the RUC model more robust -- there had been intermittent crashes in downslope wind situations since March-April. The same change was made previously to the backup-RUC at ESRL in late October, and to the dev-RUC at ESRL in August.
Differences in output are extremely small. Note: The Rapid Refresh running experimentally now at ESRL and at EMC had no crashes for any of these cases.
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