Highlights from my data quality shift last weekend (12-15 January 2017) at Hanford:

• Total duty cycle, in H1:DMT-ANALYSIS_READY: 50.10%
• There is a persistent data quality issue where a scratchy forest of lines show up right in the bucket, at mid-range frequencies between 30 and 500 Hz, coincident with really nasty wandering in the BNS inspiral range (typically from 70 Mpc around the start of a lock stretch down to as low as 40 Mpc by the time lockloss occurs)
• This issue appears to be caused by some nonlinear downconversion after > 1 kHz harmonics of the violin modes get high enough in amplitude to hit nonlinear effects in the sensing controls
• There appear to also be issues with alignment drift since the post-winter break resume of O2a. These are being looked into by Sheila Dwyer, Jeff Kissel, and Evan Goetz
• Hanford has also received some unfortunate winter weather conditions (we hope everyone at the site stays safe!) that necessitated snow plowing at the X- and Y-ends, which gave rise to glitchiness in h(t) due to upconverted 1-10 and 10-30 Hz ground motion.
• Sheila may have isolated the cause of the persistent 1080 Hz glitches we've seen since the start of O2 down to changes in the OMC length gain
• PCAL clipping has been fixed by Travis Sadecki.

Full notes may be found here: https://wiki.ligo.org/DetChar/DataQuality/DQShiftH120170111