Definition
A computer-based communications system operated by the FAA that collects, processes, and distributes aviation weather data and flight-related messages between weather sources, air traffic facilities, and pilots. It replaced the older Weather Message Switching Center and serves as the primary backbone for moving weather products such as METARs, TAFs, SIGMETs, and PIREPs across the National Airspace System.
Plain English
It is the FAA's behind-the-scenes computer system that gathers weather reports from many sources and pushes them out to the people and systems that need them, including controllers, briefers, and pilot weather services.
Context Anchor
Pilots may encounter this term in aviation weather system descriptions, FAA references, or background material about how aviation weather reports and forecasts are distributed.
Derivation
The name describes its function: a 'message switching center' for 'weather' that 'replaced' the earlier system of the same purpose. 'Switching' here means routing messages between sources and recipients, much like a telephone switchboard routes calls.
Why Pilots Care
It keeps weather data flowing reliably so pilots receive current observations and forecasts without delays.
Analogy
It works like a sorting center for weather information: messages come in from many places, are organized, and are sent on to the right users and systems.
Intuition Check
Do not read “Replacement” as a replacement weather report. Here it means the newer system that replaced an older weather message switching system.
Example Sentence 1
The METAR shown on the briefing screen was distributed through the Weather Message Switching Center Replacement after being collected from the reporting station.
Example Sentence 2
Flight service stations rely on the Weather Message Switching Center Replacement to route updated weather advisories to pilots.