Look at the tread pattern, when water is channelled into the grooves… then what, where does it go from there? Back underneath the rubber thereby lifting you off the road surface, commonly known as aquaplaning. And this is the worst aspect of these tires. Yes it will lose the water when it lifts off the surface, but you need a clear contact while it's touching the road.
When I used to rally, there were companies that followed the event around that hand cut tread in tires to your own spec/pattern. If I found to my misfortune that I had to use NCT5's again, I'd root out such a device and have ‘V' grooves cut in over the top to channel the water away, similar to how Goodyear have done their F1 GSD3 and Uniroyal their Rain sport/experts. Yes I am a directional tire fan, but there is good reason. NCT5's may be ok in California, but in the wet watch out.

