AWH 3-22

Chapter 3, Overview of Aviation Weather Information 3-22 In-Flight Icing Information Contained In: Type Summary FIP G Five icing forecast graphics derived from computer model data for the following: - Icing Probability. - Icing Severity. - Icing Severity – Probability > 25%. - Icing Severity – Probability > 50%. - Icing Severity plus SLD. MIS T A discussion of meteorological events (including inflight icing information) causing or expecting to impact the flow of air traffic across an ARTCC. Tools GFA Tool G Interactive website that includes in-flight icing (PIREPs, FIPs, AIRMETs, SIGMETs, and CWAs). Flight Service Interactive Map G Interactive website that includes icing. 3.4.2.8 Products with Freezing Level Information Table 3-11. Weather Element: Freezing Level Type: text (T), graphic (G), image (I), voice (V) Freezing Level Information Contained In: Type Summary Observations PIREP/AIREP T, G, V Included when reported. Analysis Freezing Level Analysis G Depicts the height (MSL) of the lowest freezing level. Advisories AIRMET T, G Contains one or more of the following: - Areas of multiple freezing levels. - Range of freezing levels over the area. - Lowest freezing levels at intervals of 4,000 ft MSL. Forecasts Alaska Area Forecast T A description of significant clouds and weather that includes freezing levels. Gulf and Caribbean Area Forecast T A description of significant clouds and weather that includes freezing levels. Low-Level SIGWX G Freezing level at the surface are depicted. Alaska SIGWX G Freezing levels are shown for the surface and at 2,000-ft intervals. Upper Air Forecasts G Computer model outputs for freezing levels at select height levels (available levels vary depending on the model).