Definition
An unmanned, automated weather station that measures local conditions — such as temperature, dew point, wind, pressure, and precipitation — and transmits the data automatically to a central collection point for use in aviation weather products and forecasts.
Plain English
A weather station with no person at it. It takes readings on its own and sends them in by itself, so forecasters and pilots get current weather from places that are too remote or too small for a staffed observer.
Context Anchor
Seen in FAA acronym lists, weather-information references, and airport or route planning material where automated weather reporting equipment is mentioned.
Derivation
Built from four plain words: Remote (far from people or staffed facilities), Automatic (runs itself), Meteorological (about weather), and Observing System (a setup that watches and records). Naming the parts helps because it tells you exactly what the box does and why it exists — to fill in weather coverage where no one is on site.
Why Pilots Care
Allows pilots to obtain current weather information at locations without human observers, supporting safe operations in remote regions.
Grounding Statement
Picture a small airport weather station sending current weather to pilots even when no one is standing there taking the observation.
Intuition Check
RAMOS is not a forecast and not a person giving a weather briefing. It is equipment that observes and reports current local weather conditions.
Example Sentence 1
Surface observations along that stretch of the route come from a RAMOS site, since there's no staffed weather station for a hundred miles.
Example Sentence 2
RAMOS units help fill gaps in weather coverage across vast areas like the Alaskan bush.