Definition
WX is the standard aviation shorthand for weather — the state of the atmosphere at a given time and place, including conditions such as wind, visibility, cloud, precipitation, temperature, and pressure that affect flight.
Plain English
WX just means weather. Pilots and controllers write WX instead of spelling the word out, especially in printed reports, briefings, and electronic messages.
Context Anchor
Pilots see WX in flight planning, weather briefings, NOTAMs, ATIS/AWOS/ASOS information, and cockpit or radio notes where space or time is limited.
Derivation
WX is a contraction used in telegraphy and radio operations, where short codes saved transmission time and space. It carried over into aviation messaging and stuck because it is quick to type and unambiguous on a chart or report.
Why Pilots Care
Weather drives nearly every flight decision — go/no-go, route, altitude, fuel, and alternates. Recognising WX instantly in briefings and reports keeps the pilot fluent in the language of dispatch and ATC products.
Intuition Check
Do not read WX as only “bad weather.” In aviation, WX means all weather conditions that matter to flight, including calm or clear conditions.
Example Sentence 1
The dispatcher sent a message reading 'WX deteriorating along route — recommend filing alternate.'
Example Sentence 2
Changing WX forced the crew to divert to an alternate airport.