What are the types of "WA" Airmets?

The correct answer is that "WA" Airmets specifically refer to Airmet Sierra, Airmet Tango, and Airmet Zulu. These types of Airmets are disseminated to provide information to pilots regarding certain flight conditions that may affect safety and efficiency.

Airmet Sierra addresses widespread IFR (Instrument Flight Rules) conditions or mountain obscuration, which are crucial for safely navigating in poor weather scenarios. Airmet Tango provides alerts for moderate turbulence and low-level wind shear, significant for en route safety. Airmet Zulu warns of expected moderate icing conditions, which can impact aircraft performance and safety.

These designations are essential tools used by pilots for pre-flight planning and in-flight decision-making, helping ensure operational safety in diverse weather conditions across different flight environments. Each Airmet type serves a specific purpose and covers different aspects of aviation weather, which is why they are grouped under the "WA" Airmet classification.