AWH 3-31

Chapter 3, Overview of Aviation Weather Information 3-31 3.4.2.17 Products with Cloud Base Information Table 3-20. Weather Element: Cloud Base Type: text (T), graphic (G), image (I), voice (V) Cloud Base Information Contained In: Type Summary Observations METAR, SPECI (ASOS, AWOS, ATIS) T, G, V Cloud bases included when reported. PIREP T, G, V Includes cloud bases when reported. Weather Camera I Cloud bases are difficult to estimate or impossible to determine from a camera. Analysis Surface Analysis Charts G Some surface analysis charts may plot the height of a BKN or OVC ceiling. Advisories AIRMET G Issued for areas of IFR ceilings and/or visibilities (i.e., BKN or OVC less than 1,000 ft and/or less than 3 SM). CWA T, G May be issued for ceilings less than 500 ft. Forecasts TAF T, G Cloud bases included. Aviation Cloud Forecast G Part of the derived forecasts from GFA and includes cloud bases. Alaska Area Forecast T Cloud bases included. Hawaii Area Forecast T Cloud bases included. Gulf of America and Caribbean Area Forecast T Cloud bases included. Low-Level SIGWX G Depicts forecast areas of IFR ceilings and/or visibilities (i.e., BKN or OVC less than 1,000 ft and/or less than 3 SM) as well as MVFR (i.e., BKN or OVC from 1,000 ft to 3,000 ft and/or 3 SM to 5 SM). Alaska SIGWX G Areas of forecast IFR and MVFR conditions are depicted. AFD T May include a discussion on current or forecast cloud bases and/or IFR, MVFR, etc. conditions. MIS T May include a discussion on current or forecast IFR conditions. Tools GFA Tool G Interactive website that includes overlay of forecast cloud bases as well as METAR station plots. Flight Service Interactive Map G Interactive website that includes METAR station plots.