What Is A Watch Versus A Warning 2025 Calendar. As we move into the new year, a. Annual calendar watches need to be adjusted once annually in a year, i.e., the first day of march, because they don’t recognise leap years.

A watch is used when the risk of a hazardous weather or hydrologic event has increased significantly, but its occurrence, location or timing is still uncertain. Even with the concept seeming so straightforward, calendar watches can vary with their subtle and yet profound differences.