A surprising break in the cloud cover developed in the late afternoon and observations could be made from the middle of evening twilight until just past midnight. The night was ended by high humidity and thicker cirrus moving into southern Arizona. Shortly after the dome was closed, the observatory was in and out of the fog for the rest of the night. During the usable portion of the night, the sky was mostly clear for a few stretches, but more often, observations were made through variable amounts of thin cirrus clouds. The seeing was poor (2-3 arcsec).
The storm system that had been spinning to the southwest in the Pacific
Ocean is now, finally, starting to move this way instead of just forcing
clouds to head for Arizona. There is little hope of observing over the next
few days, but maybe there will be more luck in store as during the first
half of tonight.