Please understand that astronomical observing is weather-dependent. In the event it is necessary to cancel a viewing event, our Twitter feed will be updated (and embedded above). Every effort will be made to update the status before the scheduled event. However, abruptly changing weather conditions, equipment failure, etc. may make it impossible to meet this deadline. We thank you for your patience and apologize in advance for any inconveniences.

We cannot observe if it is clouded over and/or raining. Other conditions can cause the event to be cancelled, including partial cloud cover in excess of 50%, excessive humidity, and/or high winds. If the relative humidity gets to approximately 90%, dew will begin to condense on the optics, possibly damaging their protective coatings. Once dew has formed on the optics, the observing session will be suspended. If the wind gusts to approximately 30 mph or higher, or the sustained average wind velocity during a 5 minute period reaches 15 mph or higher, it is likely that observing will not take place.
The telescopes are sensitive optical instruments that are not stable in high winds. They also must be protected from damage due to dust collecting on the optics (or high-velocity dust particles scratching them).

If there have been no patrons by 8:20, the observing session will close early. If there has not been more than two patrons by 8:30, the session will close early. Observing sessions are run entirely by volunteers so we appreciate your understanding.