FAA Aircraft Dispatcher Practical Exam | Questions with 100% Correct Answers | Verified | Latest Update 2024

How often are METARs issues? - Every hour, or whenever the weather changes and necessitates a change. In that situation, a SPECI (special METAR) is issued. What is a SPECI? - A special METAR which is created in between the hourly METARs due to a change in weather necessitating the change. -Change of winds necessitating a new runway. -WX changing from IFR to VFR or VFR to IFR. Do METARs describe actual or forecast conditions? - METARs depict actual field conditions. Define Radiation fog - Shallow fog, ground fog. occurs on clear nights, little or no wind, and small temp/DP spread (high relative humidity). Occurs at night or daybreak. Radiation cools the ground. The ground cools the air. When the air is cooled to the dew-point, fog forms. Define Advection fog - This fog forms when moist air moves over colder ground or water. Common along the coast.