IL.III.C.K2j
KnowledgeMeteorology applicable to the departure, en route, alternate, and destination under visual flight rules (VFR) in Visual Meteorological Conditions (VMC), including expected climate and hazardous conditions such as:
Fog/mist
From the FAA library
- 3 Overview of Aviation Weather Information › 3.4.2 Summaries of Specific Weather Information Contained in Various Weather Products › 3.4.2.6 Products with Fog Information
from NOAA’s GFA and includes forecasts of areas of thunderstorms at specified valid times includes obscurations such as fog/mist. Alaska Area Forecast T Visibilities of 6 SM or less and obstruction(s) to visibility are included. Hawaii Area Forecast ... obstruction(s) to visibility are included. Alaska Surface Chart G Forecast of surface weather features including areas of fog/mist at specified valid times. AFD T Describes the weather conditions as they relate to a specific TAF or group of TAFs…
- 21 Arctic Weather › 21.4 Arctic Weather Hazards › 21.4.1 Fog and Ice Fog
Weather hazards include visibility-restricting phenomena such as blowing snow, icing, frost, and lack of contrast (e.g., whiteout). 21.4.1 Fog and Ice Fog Fog occurs when water droplets or ice particles are suspended in the air at the Earth ... surface. Water-droplet fog occurs in coastal areas during the summer. Ice fog (also called ice-crystal fog, frozen fog, frost fog, frost flakes, air hoar, rime fog, and pogonip) is a type of fog formed by direct freezing…
- 27 Forecasts › 27.4.2.7 Significant Weather Group (w’w’ or NSW) › 27.4.2.7.3 Fog Forecast
includes a forecast cloud type of CB. See the following example for encoding VCTS. Example: -FZRA VCTS BKN010CB 27.4.2.7.3 Fog Forecast A visibility threshold must be met before a forecast for fog (FG) is included in the TAF. When forecasting ... fog-restricted visibility from 5/8 to 6 SM, the phenomenon is coded as BR (mist). When a fog-restricted visibility is forecast to result in a visibility of less than 5/8 SM, the code FG is used. The forecaster never…
- 18 Weather and Obstructions to Visibility › 18.1.1.1 Fog Types › 18.1.1.1.1 Radiation Fog
Fog 18.1.1.1 Fog Types 18.1.1.1.1 Radiation Fog Fog is a visible aggregate of minute water droplets that are based at the Earth’s surface, and it reduces horizontal visibility to less than 5/8 SM (1 km); unlike drizzle, it does ... fall to the ground. Fog differs from a cloud only in that its base must be at the Earth’s surface, while clouds are above the surface. Cloud droplets can remain liquid even when the air temperature is below freezing…