A professional who observes and records weather conditions for use in forecasting. Responsibilities include:

• Periodically observes general weather, sky and visibility conditions, and reads weather instruments including thermometers, barometers, and hygrometers to ascertain elements, such as temperature, barometric pressure, humidity, wind velocity, and precipitation.
• Transmits and receives weather data from other stations over teletype machine.
• May collect upper-air data on temperature, humidity, and winds, using weather balloon and radiosonde equipment.
• May conduct pilot briefings.