The observing team at Gemini keeps a detailed log of each night's science observing, also noting weather issues, technical faults and any time spent in planned engineering. It is read by Gemini staff early each morning. A summary of the night is written at the end of observing and included at the top of each night log. That summary is posted here, unedited, to give interested users a feel for what we're doing.

Show nightlog summary for the night of:

Nov 30, 2017 Predicted winter storm conditions. Closed for high humidity and winter storm on the summit.
Nov 29, 2017 Due to the high humidity, freezing conditions, and the winter storm warning still in effect Gemini North is closed tonight.
Nov 28, 2017 Due to the thick snow accumulating at the summit and the forecast of poor conditions through the night GN will be closed tonight.
Nov 27, 2017 Weather is cloudy and foggy as the last night from the beginning. Plan to do some "Cloudy" programs, or SpecPhot Standard observation if the weather condition is allowed. Sky was too cloudy. No science done for tonight.
Nov 26, 2017 The sky looks cloudy. More clouds with high humidity are expected from forecast. Plan to execute some "Cloudy queue programs". We lost entire night due to bad weather : low temperature and high humidity during the night.
Nov 25, 2017 Plan to run a KASI band 3 program (Q-68 GNIRS SXD), and queue as backup The night started with fairly clear with thin clouds. We finished one KASI band 3 program at the very beginning of the night, and tried to run some queue programs. But clouds began to cover almost entire sky so that we couldn't run any queue programs.
Nov 24, 2017 KASI programs: Q-17, Q-53, Q-68 and Gemini queue programs. Successful night. Good seeing and clear sky before 5 am, then thick cloud coming from west. We ran KASI programs GN-2017B-Q-17, GN-2017B-Q-53, GN-2017B-Q-68 and Gemini queue GN-2017B-LP-10.
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