I think we will have to wait until the first morning it blows strong NE and then gradually tapers off to 9 knots and compare that to what we experience at the riding spot. So many days the sensor itself stays pinned at solid 15 or more despite the die-off experienced at the riding spot. Then, in the evening when it spikes back up, for the most part, is masked by the "pegged at 15" phenomenon.

I actually don't think the sensor itself has ever been that bad, I think it's placement as it relates to where we ride is the "problem".

Both you and I (and a lot of riders) have noticed that the channel holds more wind than where we launch.

Anyway, I don't currently pay attention that sensor in terms of wind speed.
I live 4 minutes away and just look outside
I primarily use it to see trends in wind direction and to spot "drops to zero" for predicting sea breezes.
Glad it is back up either way (dead on accurate or not).