Definition
An FAA-approved system that allows a qualified air carrier to produce, modify, and use its own weather forecasts, analyses, and flight movement decisions in place of, or in addition to, those issued by the National Weather Service. An EWINS-authorized carrier may issue its own meteorological products — including forecasts, turbulence and icing analyses, and dispatch weather packages — under FAA-accepted procedures and with qualified meteorologists.
Plain English
A system the FAA lets some airlines run so they can prepare and use their own weather forecasts for flight planning, instead of relying only on government-issued weather products.
Context Anchor
Seen in FAA weather-source discussions and in company operations for airlines or other operators that use approved in-house weather information.
Derivation
“Enhanced” here means upgraded or extended beyond the standard — the carrier is going further than just using public weather products by producing its own. The name reflects that the carrier's weather capability has been built up to a level the FAA accepts as equivalent to, or better than, standard sources.
Why Pilots Care
It improves access to timely weather data that supports safer flight planning and in-flight decisions.
Intuition Check
Do not read “enhanced” as meaning “automatically better than all other weather sources.” Here it means the system has approved procedures for gathering and using weather information.
Example Sentence 1
The airline holds EWINS authority, so its dispatchers use in-house turbulence forecasts when planning oceanic routes.
Example Sentence 2
EWINS delivered graphical weather overlays directly to the cockpit display during cruise.