Gridded NUCAPS Issue .... followup...

I haven't noticed it until now, but when the ~18/19 UTC NUCAPS gridded data swath came into AWIPS today...it came in two different chunks.  This first image shows the northern part of the swath that came into AWIPS for the central/eastern US in the early afternoon.  Part of this swath was labeled 18 UTC and part was labeled 19 UTC (Image 1). 

Image 1.  Sample swath (925 MB Mixing Ratio, 19 UTC 22 Jun 2017)

The next swath along/near the West Coast came in at about 20 UTC.

Image 2.  Sample swath (925 MB Mixing Ratio, 20 UTC 22 Jun 2017)

However, once this last swath came in...part of the previous swath was no longer avaialble...the swath that was labeled 18 UTC and covered much of the remaining portions of the central/eastern CONUS.

So, this is a followup to the previous post where the forecaster noted the absence of available gridded data over the southern/central High Plains.  I'm not sure what is happening, as the purge rules are set lengthy enough to retain more than two swaths (in fact, it's set to 24).  It may have something to do with the domain matching.  Anyway, this is worth further investigation.

Kris W