2.2.1 Climatological information, basically in the form of climatological summaries, is available at all designated international airports in the U.S.
2.2.2 Flight documentation is provided in the form of copies of facsimile charts, copies of teletype.writer forecasts, and airport forecast decode sheets. Flight documentation materials are available at all destina-tion regular airport meteorological stations. English is the language used for all U.S. flight documentation. Briefings can be provided either in person or received by telephone at all airport meteorological offices.
2.2.3 All airport forecasts (TAF) prepared for U.S. international airports cover the following validity periods: 00.24 UTC, 06.06 UTC, 12.12 UTC, and 18.18 UTC. At the present time, specific landing forecasts are not made for any U.S. airport. The portion of the airport’s TAF valid closest to the time of landing is used in lieu of a landing forecast.
2.2.4 Supplementary information available at U.S. meteorological airport offices includes extended weather and severe weather outlooks, pilot reports, runway braking action reports (during the winter), relative humidity, times of sunrise and sunset, surface and upper air analyses, radar echo charts, and forecasts of maximum and minimum surface temperatures.
2.2.5
All meteorological offices shown as taking routine aviation observations also take unscheduled special aviation observations when meteorological conditions warrant.
3.
Types of Service Provided
3.1 Area Forecast Charts (Facsimile Form)
3.1.1 The U.S. has one Area Forecast Center, the National Center for Environmental Predictions (NCEP), located in Suitland, Maryland. The NCEP prepares current weather, significant weather, forecast weather, constant pressure, and tropopause. vertical wind shear charts for the U.S., the Caribbean and Northern South America, the North Atlantic, and the North Pacific areas. The NCEP also prepares a constant pressure and tropopause.vertical wind shear chart for Canada.
3.2 Local and Regional Aviation Forecasts (Printed Form)
3.2.1 Numerous forecasts and weather advisories are prepared which serve local and regional areas of the
U.S. These forecasts are generally prepared by the NWS on a scheduled basis or, as in the case of severe weather advisories, as needed. These forecasts are Area Forecast (FA), Airport Forecast (TAF), Severe Weather Forecast (WW), Hurricane Advisories (WT), Winds and Temperature Aloft Forecast (FD), Simplified Surface Analyses (AS), 12. and 24.Hour Prognoses (FS), and flight advisory notices, such as SIGMETs (WS), AIRMETs (text bulletins.[WA] and graphics [G.AIRMET]), Center Weather Advisories (CWA), and Radar Weather Reports (SD).
3.3 Preflight Briefing Services
3.3.1 Preflight briefing services and flight documen-tation are provided through the FAA’s Automated Flight Service Stations (AFSS).
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