AWH 3-24

Chapter 3, Overview of Aviation Weather Information 3-24 Turbulence Information Contained In: Type Summary Low-Level SIGWX G Moderate or greater turbulence is depicted. Medium-Level SIGWX G Areas of non-convective clouds with moderate or severe turbulence are depicted. High-Level SIGWX G Global forecasts of moderate or severe turbulence associated with wind shear zones and mountain waves are depicted. Alaska SIGWX G Areas of forecast moderate or greater non-convective low-level turbulence are depicted. WAFS G Global forecasts of turbulence provided in a grid point format primarily intended for use in flight-planning systems. MIS T A discussion of meteorological events (including turbulence information) causing or expecting to impact the flow of air traffic across an ARTCC. Tools GFA Tool G Interactive website that includes turbulence (PIREP/AIREP, GTG, AIRMET, SIGMET, and CWA). Flight Service Interactive Map G Interactive website that includes turbulence (PIREP/AIREP, GTG, AIRMET, SIGMET, and CWA). 3.4.2.10 Products with Volcanic Ash Information Table 3-13. Weather Element: Volcanic Ash Type: text (T), graphic (G), image (I), voice (V) Volcanic Ash Information Contained In: Type Summary Observations METAR, SPECI (ATIS) T, G, V Reported in manual and select augmented METAR/SPECIs as “VA.” Included in ATIS as appropriate. PIREP/AIREP/VAR T, G, V Reported by pilot and noted as an Urgent PIREP or Special AIREP. First part of VAR reported immediately to ATC, second part of VAR submitted postflight. Radar I Potentially visible on radar. Satellite I May be visible on satellite if not obscured by cloud cover. Weather Camera I Volcanic ash cloud may be seen on the camera. Analysis See SIGMET and VAA Advisories SIGMET T, G One of the conditions that triggers the issuance of a SIGMET. Provides an analysis and six-hour forecast location of the ash cloud. VAA T, G Provides an analysis, 6-, 12-, 18-, and 24-hour forecast location of the ash cloud. Issued every six hours until the volcanic ash is no longer discernible from satellite and no further reports of volcanic ash are received from the area. CWA T, G One of the conditions that triggers the issuance of a CWA.