The Arizona Flood Warning System (AFWS) is comprised of local, state and federal entities that collaborate statewide strategies for management and dissemination of real-time hydro-meteorological data and products for emergency managers, floodplain managers, weather forecasters and the public.

In 1979, the Arizona Legislature authorized funds to create the Arizona Flood Warning Office (ADWR originated in June of 1980). The Flood Warning fund was used to support the Arizona offices of the US Geological Survey (USGS) in maintaining their stream flow gages, and the National Weather Service (NWS) in improving flood prediction. ADWR's role expanded in 1994 when the Legislature adopted Article 6, Flood Warning Systems, §45-1501 to 45-1506. This action was in response to heavy statewide flooding in 1993, where a Governor's Task Force recommended improved communication among government entities. This began what is now commonly referred to as the Arizona Flood Warning System.

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