National Weather Service National Centers for Environmental Prediction Technical Procedures Bulletin Subject: The daily Real-Time,

upgrades to the daily real-time, global sea surface temperature analysis (RTG_SST), which was originally implemented on 30 January 2001. See TPB 477 for a description of that analysis. The new analysis with the upgrades is designated as RTG_SST_HR and was implemented into operations September 27, 2005. The original RTG_SST will continue to run in parallel for 6-12 months to allow for comparisons by users. These products are used by NCEP’s regional North American Model (NAM) and ECMWF’s global forecast model as ocean surface boundary conditions, and also by researchers studying air-sea interactions. Each daily product uses the most recent 24-hours of in situ and satellite-derived surface temperature data and provides a global SST on a 1/12 o x 1/12 o longitude/latitude grid. As part of the analysis system, there is a separate evaluation program that runs following the analysis