RCM's revisted

I may be foolish to actually try to use the RCM data..but I am.   My problem
over the last 3 weeks is that there an inordinate amount of missing stations
(resulting in a plot of NA) with both the :27 after the hour and :57 after
the hour
RCM files.  There are usually 10-25 sites that are NA.  

Am I missing a lot of data or is it just not being sent?  

This is becoming quite frustrating.

Thanks,
Robert

Robert Mullenax
Weather Systems Administrator
Universal Weather and Aviation