METARs are used by both NOAA weather for weather forecasting and Aviation to determine the status (IFR, marginal IFR, VFR, marginal VFR) of an airport. ATIS contains weather information for an airport and any issues pilots should know (for example runway closed, birds in vicinity of airport, etc.) As mentioned, ATIS has a letter designating for currency. METER currency is identified by the airport and the time issued. In addition, the ATC tower has dynamic weather such as wind direction and pressure.
1 Like