1 Agenda Topic: NOAA Environmental Modeling System (NEMS) Infrastructure Presented By: Mark Iredell (NWS/NCEP)

The NOAA Environmental Modeling System (NEMS) is an framework designed to be a superstructure* and infrastructure* for NCEP models, and it does not impose attributes.  The superstructure is used to couple model components  The infrastructure is used to share common modeling functions 2 Operational System Attribute(s)

3 Why System(s) are Operational  Primary stakeholders and requirement drivers Stakeholders and requirement drivers are NCEP modelers and developers  What products are the models contributing to? NAM North American Model and nests NGAC NEMS Global Aerosol Modeling System (coming) GFS Global Forecast System, CFS Climate Forecast System  What product aspects are you trying to improve with your development plans? More customers!  Top 3 System Performance Strengths Common model interface Common model I/O Coupling mediators  Top 3 System Performance Challenges CFSv3 Hurricane coupling 3D coupling e.g. for WAM/IPE

4 System Evolution Over the Next 5 Years  Major forcing factors Emerging requirement drivers (from modelers and developers) Changing technology (from hardware and software industry)  Science and development priorities Coupling all NCEP modeling systems (DA through products) More shared modeling infrastructure  What are you top challenges to evolving the system(s) to meet stakeholder requirements? Challenges evolving current operational systems into NEMS  Potential opportunities for simplification going forward As more components are coupled, it will only get more complex Shared infrastructure is a simplification opportunity, with challenges

5 Top 3 Things You Need From the UMAC 1.Endorsement of plan to continue to unify modeling superstructure and infrastructure under NOAA Environmental Modeling System and companion software infrastructure 2.Guidance for possible changes to make in NEMS development path and priorities