AWH 3-23

Chapter 3, Overview of Aviation Weather Information 3-23 Freezing Level Information Contained In: Type Summary Tools GFA Tool G Interactive website that includes freezing levels. Flight Service Interactive Map G Interactive website that includes freezing levels. 3.4.2.9 Products with Turbulence Information Table 3-12. Weather Element: Turbulence Type: text (T), graphic (G), image (I), voice (V) Turbulence Information Contained In: Type Summary Observations PIREP/AIREP T, G, V Turbulence reports include location, altitude, and aircraft type. The pilot determines the degree of turbulence, intensity, and duration. Severe or extreme turbulence is reported as an Urgent PIREP or Special AIREP. The vast majority of AIREPs are automated and include turbulence reports derived from the aircraft’s motion. Radar I Convective weather on radar could indicate potential areas of severe turbulence. Satellite I Potential turbulence areas may be inferred from certain cloud patterns by a meteorologist or trained specialist. CB always implies severe turbulence. Analysis GTG G Product provides a computer analysis of turbulence based on multiple computer algorithms. Graphic also depicts any turbulence PIREPs. Advisories Convective SIGMET T, G Possible severe turbulence is implied within the convective SIGMET area. SIGMET T, G Issued for severe turbulence not associated with thunderstorms. AIRMET T, G AIRMET Tango depicts areas of active or expected moderate turbulence. The product is divided into high and low altitude at 18,000 ft. CWA T, G May be issued for moderate or greater turbulence not covered by an existing AIRMET or SIGMET. Forecasts TAF T, G Low-level mechanical turbulence could be inferred when strong and gusty surface winds are forecast. Alaska Area Forecast T Expected turbulence conditions are included along with the following information: - AIRMET information for turbulence or LLWS. - Turbulence not meeting SIGMET/AIRMET criteria during the six to 12- hour period. - “NIL SIG” is noted if no significant turbulence in forecast. Gulf of America and Caribbean Area Forecast T Moderate or greater turbulence is noted at the end of forecast bulletin.