Why is updated weather information crucial during a flight?

Updated weather information is crucial during a flight primarily to assess its impact on the flight. Weather conditions can significantly affect various aspects of a flight, including safety, route planning, fuel efficiency, and timing. For instance, changes in weather such as turbulence, storms, or visibility issues can necessitate an alteration in flight altitude or route to ensure the safety of passengers and crew.

By continuously monitoring weather updates, the flight crew can make informed decisions to optimize the flight path, avoid hazardous conditions, and ensure a comfortable and safe journey. This real-time assessment is essential not only for safety but also for maintaining schedule adherence and operational efficiency. The critical nature of this information highlights why it's a top priority during the flight, contrasting with elements like meal planning or entertainment, which do not directly affect the operational safety and decision-making process during flight.