FAA - FO JO 7900.5E
Surface Weather Observing
|Publication Date:||15 January 2020|
Purpose of This Order.
This order prescribes aviation surface weather observing procedures and practices. This order includes practices and procedures for both manual and automated observation locations. Also included are practices and procedures for augmentation of automated observations and backup information in the event of system failure, erroneous or non-representative data. These procedures and practices are intended to provide a framework for identifying meteorological phenomena of importance to aviation and reporting their occurrence.