It was obvious yesterday that river7's winds were completely different from the other sites.  Our internal checks showed that diag and sigma_w/u* from this site were okay and reasonable.  I show corroborating evidence below from the MesoWest network that gap flow does occur at this site.  The time series of the MesoWest Riverton site (hopefully not our data!) shows exactly the same behavior in wind speed that we observe.