Final answer:
In aviation, when the Winds/Temps aloft forecast shows 'impossible' figures like '99' for direction or '199' for speed, it signifies calm conditions or unreliable data. Pilots should consult alternative information sources or plan conservatively, ensuring safety and efficient resource management during flight.
Step-by-step explanation:
When dealing with Winds/Temps aloft forecasts in aviation, sometimes the predicted wind direction or speed can be listed as impossible, indicated by specific codes such as '99' for direction or '199' for wind speed in knots. These codes mean that the wind is calm or the data is not available or not reliable. In such cases, pilots or flight planners should rely on alternative sources of information or use conservative estimates to ensure safety. This could mean planning for higher fuel consumption due to unpredictable headwinds or selecting alternative routes.
In a practical scenario, this precaution helps adjust the flight plan and conserves resources, as adverse weather conditions can significantly impact a flight's trajectory and fuel consumption. Additionally, it's crucial to check updated forecasts before flight and en route, which can be obtained from Flight Service Stations or online resources if applicable. Ultimately, being prepared for a variety of scenarios potentiates safety measures and informed decision-making during flight operations.