What is the meaning of Advisory?

Able to give advice.

Containing advice; advising.

A warning.

Official information issued by the National Weather Service that highlights special weather conditions that are less serious than a warning. They are for events that may cause significant inconvenience, and if caution is not exercised, it could lead to situations that may threaten life and/or property.

Supervision by an advisor.

Source: wiktionary.org