Definition
On a surface weather map, the small circle plotted at each reporting station's location, around which weather data — such as temperature, dew point, wind, pressure, and sky cover — are arranged in a standardized layout. The amount of shading inside the circle indicates the fraction of sky covered by clouds.
Plain English
It is the little circle on a weather map that marks where a weather station is. The circle itself shows how much of the sky is covered by clouds, and the numbers and symbols around it tell you the weather at that spot.
Context Anchor
Seen on surface weather maps and station plots when reading reported wind, pressure, and sky cover for a location.
Derivation
‘Station’ comes from the Latin statio, meaning a fixed place or post. The circle is literally the marker for the station's fixed location on the map — a small circle representing that observing post.
Why Pilots Care
It lets a pilot read the exact wind, visibility, and sky conditions at points along a planned route without needing separate text reports.
Grounding Statement
Picture one reporting airport on a weather map: the station circle is the small round marker where that airport’s weather information is plotted.
Intuition Check
A station circle is not a flight maneuver, a holding pattern, or an area around a station. On a surface weather map, it is a map symbol for a weather reporting location and its sky cover.
Example Sentence 1
He located the station circle for the departure airport and read the surrounding plot to check current conditions.
Example Sentence 2
Checking the station circle helped confirm that clouds were scattered rather than overcast before departure.