Observers: Kevin Croxall, Jonathon Brown Support Astronomer: Dave A. Telescope Operator: Steve A. Summary Clouds at sunset. Possibly breaking up. The missing MOS masks are being installed. Completed remaining calibrations. Humidity finally dropped about 1am local. However, we could only stay open long enough to collimate and observe a standard. Details: All times are UTC unless otherwise indicated Configured for MODS1 03:07 - briefly could make out jupiter on the all sky cam humidity not appearing friendly. 03:41 - Instrument scientist finished with various tests starting MODS1 calibrations NGC4254_f4.cal there is an issue with one of the slits in NGC4254_f4 slit located at 2186,1955 has some possible debris will be inspected tomorrow. These calibrations may need to be redone. NGC3351_f1.cal NGC3351_f2.cal NGC4321_F1.cal NGC4321_F2.cal as the UM_M81 program had no calibration files using the masks for which observations were requested, I created some in case those files are needed. UM_M81_F2.cal UM_M81_F3.cal slitflats_b: binned blue flats 07:00 - still moderate clouds with high humidity. waiting for the humidity to drop so we can open. 07:25 - humidty has dropped enough opening dome. 07:36 - collimating seeing ~1.2" 07:40 - acquiring Hz44 07:48 - starting obs seeing ~1.2 humidity rising again... 08:14 - acquiring ND_COSLLS:j1306+4351 seeing ~1.2" 08:23 - humidity at 95% closing dome. 08:48 - humidity down... but no stars visible now.