Plain English Meaning
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.
Full 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.
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.