The timing system has a corner station error: the MSR atomic clock 1PPs difference went from -159nS to 0.11S at 19:31 PDT this evening.
This signal is for verification purposes and does not drive the timing system. We will take a look at what has happened to it in the morning.
The atomic clock was fairly stable over the past 50 days or so, and then jumped. Not sure what could cause this short of a power glitch.