Definition
A cockpit service that delivers near real-time weather information to the aircraft in flight via a digital radio link, typically displayed on a multifunction display or portable electronic device. Common products include radar imagery, METARs, TAFs, AIRMETs, SIGMETs, winds aloft, and lightning data, transmitted through systems such as FIS-B (free, via ADS-B ground stations) or satellite-based services like SiriusXM Aviation.
Plain English
A way for pilots to receive weather updates while flying, sent wirelessly to a screen in the cockpit so they can see what the weather is doing without having to call anyone on the radio.
Context Anchor
You encounter this term when using cockpit displays or tablets that show in-flight weather as part of enhanced situational awareness.
Derivation
Datalink means a digital communication channel between two systems — here, between a ground or satellite source and the aircraft. The term highlights that weather information is being transmitted as data rather than spoken over the radio.
Why Pilots Care
Gives pilots current weather information in flight so they can avoid storms, turbulence, or icing and make safer route decisions.
Intuition Check
Weather datalink does not mean live weather and it does not make bad weather safe to enter. It is decision-support information, and the pilot still has to consider its age, accuracy, and what is actually visible outside.
Example Sentence 1
Before descending into the valley, she checked the weather datalink and saw a fast-moving line of storms pushing in from the west.
Example Sentence 2
Before descent the crew used the weather datalink to confirm that the destination airport still had clear skies.