AWH 3-34

Chapter 3, Overview of Aviation Weather Information 3-34 Pressure Information Contained In: Type Summary Advisories Forecasts Surface Prog Charts G Sea level pressure is depicted as isobars. High- and low- pressure centers depicted. Tools 3.4.2.21 Products with Fronts Information Table 3-24. Weather Element: Fronts Type: text (T), graphic (G), image (I), voice (V) Fronts Information Contained In: Type Summary Observations METAR, SPECI (ASOS, AWOS, ATIS) T, G, V Manually produced METARs and SPECIs may report “FROPA” in the RMK portion. Analysis Surface Chart Analysis G Depicts the location of fronts as well as the high- and low-pressure systems. Advisories Forecasts TAF T Fronts are not explicitly mentioned under weather phenomena, but a significant change in wind direction coupled with changes in other elements can imply a forecast frontal passage. Alaska Area Forecast T There is a brief discussion of the synoptic weather affecting the region during the first 18-hour valid period, which could include frontal boundaries. Hawaii Area Forecast T There is a brief discussion of the synoptic weather affecting the region during the first 18-hour valid period, which could include frontal boundaries. Gulf of America and Caribbean Area Forecast T There is a brief discussion of the synoptic weather affecting the region during the entire 24-hour valid period, which could include frontal boundaries. Alaska SIGWX G Pressure systems and fronts are included using standard symbols. Alaska Surface Chart G Fronts are depicted using standard symbols for this chart. This product is issued every six hours with forecasts valid for 00Z, 06Z, 12Z, and 18Z. Surface Prog Charts G Fronts are included using standard symbols. AFD T May include a discussion on fronts when applicable. Tools