The Subseasonal Experiment (SubX) is a project producing retrospective and real-time predictions on subseasonal timescales. Six global models are producing seventeen years of ensemble retrospecive forecasts initialized weekly with daily output to investigate subseasonal prediction and predictability. Additionally, one-year of real-time predictions will be produced and provided to the NOAA/NWS Climate Prediction Center as additional guidance for their week-3/4 outlooks.

The Objectives of the SubX Project are:

• Collecting and serving data both internally at CPC for use by operational forecasters and for the external community via the IRI data library
• Providing a baseline verification particularly for the weeks 3-4 temperature and precipitation probability forecasts
• Multi-model evaluations and combinations including selecting suitable models, optimizing the design of the system, and evaluation of the prediction products
• Enhancing communications between operational forecasts and the model forecast producers