DQ shifter: Beverly

LHO fellows: Heather, Vaishali, Evan

• Excellent duty cycle averaging 86.8% over the three days including 100% on Wednesday and a remarkable 77% on maintenance Tuesday.
• The BNS range was very steady at around 70 Mpc with brief episodes of slightly lower range.
• An especially noisy period between 22:10 and 22:26 on Wednesday resulted from moving a forklift and roof walking during Observing (see alog 34330).
• Excess noise in h(t) appeared at around 13:00 on Tuesday and Wednesday that appeared to be correlated with a bump in ground motion and excess bounce/roll mode noise. On Wednesday, this could be related to a wind spike and a degredation of the YAW alignment observed at that time (see forthcoming alog from Heather). This correlation happened previously (see alog 32370 ) and was attributed to truck traffic on Route 10 near the entrance to the site. 
• Some noise visible as "towers" in the hourly h(t) spectrograms appear to be "blue mountains" aka "scratchy" of unknown cause.
  Full results may be found at https://wiki.ligo.org/DetChar/DataQuality/DQShiftLHO20170220.