The correct option is: less severe, more common conditions and are generally issued for 6-hour periods.
AMETAR is a type of aviation weather report that provides information on meteorological conditions at an aerodrome. It typically includes information on wind direction and speed, visibility, cloud cover, and precipitation. AMETAR reports are issued every hour and are valid for a period of one hour.
AMETAR reports are designed to provide pilots with information on current weather conditions to help them make informed decisions about flight planning and safety. They typically include information on less severe, more common weather conditions that may affect flight operations, such as thunderstorms, fog, or icing. These reports are generally issued for 6-hour periods to provide pilots with a snapshot of weather conditions over a longer period of time.