Which aviation service provides real-time weather observations?

The service that provides real-time weather observations is the Automated Weather Observing System, commonly known as AWOS. This system is designed to gather and deliver current weather information, including wind speed and direction, temperature, humidity, visibility, and barometric pressure. AWOS provides this data automatically, which is crucial for pilots needing current weather conditions for making informed decisions during flight operations.

AWS, which might refer to an Automated Weather Service or similar systems, does not specifically focus on real-time observations in the way AWOS does. ATIS, or Automatic Terminal Information Service, broadcasts essential information to pilots approaching and departing from airports, including weather, but it is not a dedicated weather observation system. METARs are weather observation reports that provide weather data at airports but are typically updated every hour rather than providing continuous real-time observations. Thus, AWOS is specifically structured to deliver immediate weather observations, making it the most pertinent choice for this question.