Definition
Weather data delivered to the cockpit or controller with only a short delay between the time it was observed or generated and the time it is displayed, typically on the order of seconds to a few minutes rather than truly instantaneous.
Plain English
Weather information that is very recent but not perfectly live. There is always a small lag between when the weather is measured and when you see it on a screen.
Context Anchor
Seen in discussions of modern cockpit displays, flight planning tools, and NextGen systems that give pilots more current weather information during planning or flight.
Derivation
"Real-time" means happening right now, with no delay. "Near" softens that — close to real-time, but not exactly. The phrase is borrowed from computing, where "near real-time" describes data that updates continuously but with a small, known lag.
Why Pilots Care
Supports safer route and altitude decisions by reducing the risk of encountering unexpected weather that developed after older data was issued.
Grounding Statement
If a rain area was reported a few minutes ago, the display may be useful, but the rain may have already moved by the time the pilot reaches it.
Intuition Check
Do not read “near real-time” as “live with no delay.” It means close to current, but still slightly behind what is actually happening outside.
Example Sentence 1
The cockpit display showed near real-time weather information from the ADS-B feed, with a data age of about four minutes.
Example Sentence 2
FIS-B broadcasts deliver near real-time weather information to equipped aircraft throughout the flight.