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The Wang-Sheeley-Arge (WSA)-ENLIL+Cone model is used extensively in spaceweather operations world-wide to model CME propagation. As such, it isimportant to assess its performance. We present validation results of theWSA-ENLIL+Cone model installed at the Community Coordinated Modeling Center(CCMC) and executed in real-time by the CCMC space weather team. CCMC uses theWSA-ENLIL+Cone model to predict CME arrivals at NASA missions throughout theinner heliosphere. In this work we compare model predicted CME arrival-times toin-situ ICME leading edge measurements at STEREO-A, STEREO-B, and Earth (Windand ACE) for simulations completed between March 2010-December 2016 (over 1,800CMEs). We report hit, miss, false alarm, and correct rejection statistics forall three locations. For all predicted CME arrivals, the hit rate is 0.5, andthe false alarm rate is 0.1. For the 273 events where the CME was predicted toarrive at Earth, STEREO-A, or STEREO-B, and was actually observed (hit event),the mean absolute arrival-time prediction error was 10.4 +/- 0.9 hours, with atendency to early prediction error of -4.0 hours. We show the dependence of thearrival-time error on CME input parameters. We also explore the impact of themulti-spacecraft observations used to initialize the model CME inputs bycomparing model verification results before and after the STEREO-Bcommunication loss (since September 2014) and STEREO-A sidelobe operations(August 2014-December 2015). There is an increase of 1.7 hours in the CMEarrival time error during single, or limited two-viewpoint periods, compared tothe three-spacecraft viewpoint period. This trend would apply to a future spaceweather mission at L5 or L4 as another coronagraph viewpoint to reduce CMEarrival time errors compared to a single L1 viewpoint.

Verification of real-time WSA-ENLIL+Cone simulations of CME arrival-time at the CCMC from 2010-2016