Summary:  H1 was DOWN (at CORRECTIVE MAINT) for 38hrs & 2mins due to computer crash + heavy winds.

Dolphin Crash:  On Tues Morning (12/31/19) at about 4am local time (12utc) H1 went down due to a corner station Dolphin crash (alog & FRS); most of the recovery from this was complete during Ed's graveyard & Cheryl's Day shift (but there were some lingering items which have come up over the last few days as well).

Wind:  On top of computer crash, there was:  WIND!!  (w/ a dash of microseism).  Sustained winds over 20mph started basically 2hrs after the computer crash (6am or 14utc on 12/31) and we remained windy until about only a few hours ago (3pm/23utc today).  #Tumblegeddon was fierce.

THANKS!!:  Ed, Dave, Cheryl, Keita, Jim, Jenne, & Sheila for getting H1 back!!

Back To NOMINAL_LOW_NOISE (at 2:05utc/6:02pm Local)

For most of the day Cheryl was working on H1 with Sheila/Keita over the phone today.  When I got handoff from Cheryl, H1 and I hung around at ENGAGE DC VIOLINS.  Hung out here, because the most recent plan of attack was to do the MOVE SPOTS step later in the ISC_LOCK order (basically, would first power up H1 to 10W, then MOVE SPOTS, and then continue to 20W).  Sheila (remotely) walked H1 through these steps.  Once we were at 20W, Sheila gave me the OK to continue on to NLN like normal and we made it there minutes later with no problem.

(Operator Note:  in the background, Sheila updated Guardian code (& I LOADed ISC_LOCK) so that operators should be able to proceed through ISC_LOCK like normal for the next lock.)

This lock started with the fundamental violin mode noticeably a little high (above 10^ -16 on the running DARM, but the VIOLIN DAMPING node has been bringing them down.

There were some IFO notifications (seen on the Intent Bit).  Two of them were related to an SPM diff for ISI ITMx St2 RX & RY filter banks having a T Ramp of 5 (vs 0)...I took them to 0 to clear this.  The other notifications are due to Violin Mode damping & IMC WFS not being centered (we've been living with these as of late.

SDF Diffs:

Upon getting back to NLN, had a few SDF diffs.  I took a screenshot of all of them (1st attachment).  I then ACCEPTED all the known ones (with Sheila observing remotely)....basically:  IMC PZT offset change due to computer crash & Time Ramps.

There were some ISI diffs for HAM2 & ITMx (see 2nd attachement).  I went ahead and ACCEPTED these as well, but Jim/Hugh should review this.