High-altitude dust from the north for six consecutive nights. Transparency 1, SQM down to 20.4 at the zenith with no moon — a full magnitude and a half worse than median, entirely from suspended dust.
Nothing to be done and nothing to observe. All four deep-sky bookings for the week were rescheduled.
Logged because guests sometimes ask whether the site is ever unusable. It is, about one week a year, and February is when.
Logged by Sofía Marchant, optics and instruments.