Which action is NOT recommended if encountering serious weather across your proposed route?

When encountering serious weather across your proposed route, it is vital to prioritize safety and communication. Requesting radar vectors from Flight Service Stations (FSS) is not typically the first choice because FSS primarily provides services such as weather briefings and flight plan filing rather than real-time radar vectors, which are more commonly offered by Air Traffic Control (ATC). Instead, pilots should focus on options that promote safe navigation around hazardous weather.

Changing altitude immediately can be dangerous if done without careful consideration or communication, as it could lead to altitude conflicts with other aircraft. Rerouting to another airport is a prudent decision if the weather situation warrants it, allowing pilots to avoid potentially hazardous conditions. Consulting with ATC is crucial in these situations, as they have current information on weather and can provide guidance on the safest course of action. This emphasizes the importance of navigating based on real-time data and the coordination necessary when facing adverse weather conditions.