AWH 3-25

Chapter 3, Overview of Aviation Weather Information 3-25 Volcanic Ash Information Contained In: Type Summary Forecasts TAF T Included when conditions are expected and indicated in the forecast as “VA” under the significant weather group. Alaska Area Forecast T Obstructions to visibility such as volcanic ash are noted in the description of significant clouds and weather for the region during the first 12 hours of the forecast period. Hawaii Area Forecast T Obstructions to visibility such as volcanic ash are noted in the description of significant clouds and weather for the region during the first 12 hours of the forecast period. Gulf of America and Caribbean Area Forecast T Obstructions to visibility such as volcanic ash are noted in the description of significant clouds and weather for the region during the first 12 hours of the forecast period. Medium-Level SIGWX G Erupting volcano is identified with a trapezoidal symbol along with the name, latitude, and longitude. Location of ash cloud is not depicted. High-Level SIGWX G Erupting volcano is identified with a trapezoidal symbol along with the name, latitude, and longitude. Location of ash cloud is not depicted. AFD T May include a discussion on volcanic ash when applicable. MIS T A discussion of meteorological events (including volcanic ash cloud) causing or expecting to impact the flow of air traffic across an ARTCC. Tools GFA Tool G Interactive website that includes SIGMETs and CWAs for volcanic ash cloud when they are in effect. Flight Service Interactive Map G Interactive website that includes SIGMETs and CWAs for volcanic ash cloud when they are in effect. 3.4.2.11 Products with Tropical Cyclone Information Table 3-14. Weather Element: Tropical Cyclone (e.g., Hurricane) Type: text (T), graphic (G), image (I), voice (V) Tropical Cyclone Information Contained In: Type Summary Observations Radar I Tropical cyclones are visible on radar when in range. Satellite I Tropical cyclones are visible on satellite. Analysis Surface Analysis Chart G Tropical cyclones are included using standard symbols. Advisories Convective SIGMET T, G Issued for thunderstorms associated with tropical cyclones. SIGMET T, G SIGMETs are issued for tropical cyclones except over the CONUS and associated coastal waters.