The NCAR Ensemble experiment that began in 2015 is partially supported by STEP and is one of the two cross-theme demonstration projects that provide platforms for testing STEP forecasting system and enhancing research collaborations. The analysis of NCAR Ensemble is run over the CONUS domain with 6-hourly continuously-cycled ensemble adjustment Kalman filter (EAKF) at 15km horizontal and 80 ensemble members.  The ensemble forecast is conducted with 10 ensemble members with 3km horizontal resolution producing 48-h forecasts once a day. The NCAR Ensemble provides valuable dataset for evaluating the merit of ensemble prediction at the convection-permitting scale over a large domain. The NCAR Ensemble is also supported by three external funded projects: NOAA VORTEX-SE , NOAA HWT, and NASA GOES-R. A dedicated web page (https://ensemble.ucar.edu) displays various real-time ensemble products.