Under the 1-2-3 rule, what specific weather conditions pertain to the ceiling and visibility limits?

The 1-2-3 rule, typically used in aviation, is a guideline for pilots regarding weather conditions necessary for certain flight operations. In this case, the correct conditions refer to a ceiling that is less than 2,000 feet and visibility that is also less than 3 statute miles (SM).

These conditions indicate a lower level of flight safety due to reduced visibility and altitude restrictions, which would necessitate a requirement for increased awareness and adherence to specific operational guidelines. Understanding these parameters is crucial for flight planning and safety, as they directly impact the decision-making process for pilots. When the ceiling and visibility are below these thresholds, pilots are advised to proceed with caution and may need to adjust their operations accordingly, such as considering alternate flight paths or potential diversions.

The details of the other options do not align with the established criteria of the 1-2-3 rule as they reflect conditions that are either too favorable or unsuitable for certain flight operations, leading to potentially unsafe situations.