IP.I.B.K3j
KnowledgeMeteorology applicable to the departure, en route, alternate, and destination for flights conducted under Instrument Flight Rules (IFR) to include 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…
- Chapter 12: Weather Theory › Atmospheric Stability › Fog
this point, water vapor in the air condenses and becomes visible in the form of fog. Fog is classified according to the manner in which it forms and is dependent upon the current temperature and the amount of water vapor ... clear nights, with relatively little to no wind present, radiation fog may develop. [Figure 12-21] Usually, it forms in low-lying areas like mountain valleys. This type of fog occurs when the ground cools rapidly due to terrestrial radiation…
- 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 › 18.1.1.1.4 Frontal Fog
Upslope Fog Upslope fog forms as a result of moist, stable air being adiabatically cooled to or below its dewpoint as it moves up sloping terrain (see Figure 18-7). Winds speeds of 5–15 kt are most favorable since ... stronger winds tend to lift the fog into a layer of low stratus clouds. Unlike radiation fog, it can form under cloudy skies. Upslope fog is common along the eastern slopes of the Rocky Mountains and somewhat less frequent east…