The Subseasonal Experiment (SubX)

Abstract

The subseasonal experiment (SubX) is a multi-model subseasonal prediction experiment. Seven global models are producing seventeen years of retrospective (re-) forecasts and one year of weekly real-time forecasts. Re-forecasts follow the SubX protocol that requires the years 1999-2015, at least three ensemble members, a minimum of weekly initialization, and at least 32-days in length. All data are output on a 1deg x 1deg grid. The re-forecasts are archived at the IRI Data Library for research on subseasonal predictability and predictions. The real-time forecasts are produced weekly, beginning July 7, 2017. Each modeling group provides their forecasts, following the same protocol as the re-forecasts, to the NOAA/NWS/NCEP/Climate Prediction Center as guidance for their week 3-4 temperature and precipitation outlooks. These real-time forecasts are archived for public use at the IRI Data Library.