AWH 3-27

Chapter 3, Overview of Aviation Weather Information 3-27 Sandstorm/Dust Storm Information Contained In: Type Summary AFD T May include a discussion on current or forecast sandstorms/dust storms when applicable. Tools Graphical Forecasts for Aviation (GFA) Tool G Interactive website that includes sandstorms/dust storms, if applicable. Flight Service Interactive Map G Interactive website that includes sandstorms/dust storms, if applicable. 3.4.2.13 Products with Mountain Obscuration Information Table 3-16. Weather Element: Mountain Obstruction Type: text (T), graphic (G), image (I), voice (V) Mountain Obscuration Information Contained In: Type Summary Observations METAR, SPECI (ASOS, AWOS, ATIS) T, V May be included in RMK section at some mountain airports. At times it may be inferred or implied by the reporting of clouds at ASOS/AWOS located in mountain passes. PIREP T, G, V Included when reported. Weather Camera I Mountain obscuration may be visible on the camera. Advisories AIRMET T, G AIRMET Sierra are issued when widespread mountain obstruction is occurring or expected to occur. Forecasts Aviation Clouds Forecast G Part of the derived forecasts from the GFA and includes overlays of mountain obscuration when applicable. Alaska Area Forecast T A description of significant clouds and weather including mountain obscuration. AFD T May include a discussion on current or forecast mountain obscuration. Tools GFA Tool G Interactive website that includes mountain obscuration, if applicable. Flight Service Interactive Map G Interactive website that includes mountain obscuration, if applicable. 3.4.2.14 Products with Surface-Based IFR Information For most aviation weather products, IFR refers to ceilings less than 1,000 feet (ft) (i.e., above ground level (AGL)) and/or surface visibilities less than 3 statute miles (SM). But many aviation weather websites provide a graphical depiction of METARs or Aviation Selected Special Weather Reports (SPECI), and sometimes TAFs, using color-coded station plots for various Weather Flight Categories. These Weather