View source for Hazardous Inflight Weather Advisory Service

'''Hazardous Inflight Weather Advisory Service''' ('''HIWAS'''<ref>{{cite web|url=http://www.faa.gov/documentLibrary/media/Order/ND/7340.1Z.pdf|title=Order JO 7340.1Z: Contractions|publisher=[[Federal Aviation Administration]]|date=March 15, 2007}}</ref>) was a continuous broadcast of hazardous weather information which is transmitted over selected [[VHF omnidirectional range|VOR]]s.  This hazardous weather includes [[AIRMET]]s, [[SIGMET]]s, Convective SIGMETs, Center Weather Advisories (CWAs), Severe Alert Weather Watches (AWWs), and urgent [[PIREP]]s.<ref>{{cite web|title=Aeronautical Information Manual|url=https://www.faa.gov/air_traffic/publications/|website=Air Traffic Plans and Publications|publisher=Federal Aviation Administration|accessdate=7 December 2016}}</ref>

The presence of HIWAS information on a VOR was indicated on a [[sectional chart|sectional]] or [[terminal area chart]] by an "H" in the upper-right corner of the box surrounding the [[NAVAID]] frequency.<ref>[http://www.faa.gov/library/manuals/aviation/pilot_handbook/media/faa-h-8083-25-3of4.pdf Weather Theory] {{webarchive|url=https://web.archive.org/web/20070125162659/http://www.faa.gov/library/manuals/aviation/pilot_handbook/media/faa-h-8083-25-3of4.pdf |date=2007-01-25 }}</ref>

On 8 January 2020 the Federal Aviation Administration discontinued the HIWAS service in favor of [[Automatic dependent surveillance – broadcast#Flight information services-broadcast (FIS-B)|Flight Information Services-Broadcast (FIS-B)]] and other modern means of accessing in-flight weather data.<ref>{{cite web |title=Discontinuation of Hazardous Inflight Weather Advisory Service (HIWAS) in the Contiguous United States |url=https://www.federalregister.gov/documents/2019/12/09/2019-26386/discontinuation-of-hazardous-inflight-weather-advisory-service-hiwas-in-the-contiguous-united-states |website=Federal Register |date=9 December 2019 |accessdate=10 January 2020}}</ref>

==References==
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[[Category:Meteorological data and networks]]
[[Category:Weather warnings and advisories]]