PRODUCT: International Aerodrome Aviation Forecasts (TAF)

Draft OML filed with D-37

ISSUED BY: All NWS Forecast Offices

PURPOSE: As a Contracting State of the International Civil Aviation Organization (ICAO), the U.S. is mandated to provide pilots operating aircraft inbound for domestic destinations from airports of international origin with expected cloud, visibility, weather, and wind conditions at the destination or alternate landing site. TAFs are generally of use in the preflight phase and are widely distributed through both the NWS and Federal Aviation Administration (FAA) communication networks. NWS-prepared TAFs are issued for approximately 530 airports nationwide.

CHANGES: Effective July 1, 1996, the TAF officially replaced the domestic aviation terminal forecast (FT). The implementation of the new code brought the United States in line with practices used throughout the international community. Several exceptions, however, were granted to the United States to maintain some consistency with the previous domestic code. For example, in NWS-prepared TAFs:

                    b.   Quantitative estimates of cloud cover are not given;
c. Visibilities are in statute miles; and
d. CAVOK and NSC are not used.

COMMENTS: TAFs are issued four (4) times daily at the synoptic times of 0000, 0600, 1200, and 1800 UTC. Amendments are issued as necessary.

CONTACT: Judson Ladd, W/SR1x2
Regional Aviation Meteorologist
(817) 978-2652 Ext. 109

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Last updated December 12, 1996
Missy Perales