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