AWH 3-18

Chapter 3, Overview of Aviation Weather Information 3-18 Visibility Information Contained In: Type Summary Advisories AIRMET T, G AIRMET Sierra depict areas of surface-based IFR (ceilings less than 1,000 ft and/or visibilities less than 3 SM) that is occurring or expected to occur. CWA T, G Issued if conditions are at or approaching low IFR (ceiling less than 500 ft and/or visibilities less than 1 SM). Forecasts TAF T, G Included under the visibility group when prevailing visibility is forecast to be less than or equal to 6 SM. Aviation Surface Forecast G Derived from the GFA and includes forecasts of visibility at specified valid times. Alaska Area Forecast T Visibilities of 6 SM or less and obscurations to visibility are included. Hawaii Area Forecast T Visibilities of 6 SM or less and obscurations to visibility are included. Gulf of America and Caribbean Area Forecast T Visibilities of 6 SM and obscurations to visibility are included. AFD T Describes the weather conditions as they relate to a specific TAF or group of TAFs, including visibilities. Tools GFA Tool G Interactive website that includes visibility. Flight Service Interactive Map G Interactive website that includes overlay of AIRMET Sierra and CWAs. 3.4.2.5 Products with Precipitation Information Table 3-8. Weather Element: Precipitation Type: text (T), graphic (G), image (I), voice (V) Precipitation Information Contained In: Type Summary Observations METAR and SPECI (ASOS, AWOS, ATIS) T, G, V Precipitation is reported in the body section of the METAR/SPECI when observed or detected. Some AWOS systems do not report precipitation. PIREP T, G, V Pilot reports may include precipitation, which in places in the “/WX” section of the PIREP. Radar I Radar provides intensity levels of precipitation. Weather Camera I Precipitation may be seen on the camera. Analysis Surface Analysis Chart G Precipitation is included within the station plot models or when charts are combined with radar imagery.