38 Questions
What type of fog forms when warm, moist air cools to saturation over cold water?
Sea fog
What is the key factor that makes sea fog formation unlikely?
Initial dew point less than cold water temperature
How does sea fog dissipate when carried over a warmer surface?
Change in wind direction
What effect can an increase in wind speed have on surface fog?
Causes the fog to lift into a cloud layer
In what conditions does radiation fog occur?
High dew point and cold air temperature
What is the first step in making a good radiation fog forecast?
Accurately predicting nighttime minimum temperature
What is the result of heating from below on sea fog?
Forms a stratus deck
How can sea fog restrict ceilings and visibility again after dissipating?
Rolling back in due to cooling after the heat of the day
What is the primary cause of fog forming?
Cooling of the air
Which type of fog occurs due to moist air moving over a colder surface?
Advection Fog
What is another name for Radiation Fog?
Ground Fog
In what conditions does Upslope Fog occur?
When sloping terrain lifts air
What happens to the ground under stable nighttime conditions that leads to the formation of Radiation Fog?
It emits long-wave radiation cooling the air
How is fog composed of ice crystals referred to?
Ice Fog
What does adding enough moisture to raise the dew point result in?
Frontal Fog
What distinguishes fog from a stratus cloud?
Fog forms near the ground, while a stratus cloud is higher in the sky.
Which two basic ingredients are necessary for precipitation to occur?
Moisture and lifting mechanisms
Why is it important to include the estimated layer height top and/or base when reporting visibility?
To identify the specific obstruction to vision
What are some examples of lifting mechanisms for precipitation?
Convection, orographic lifting, and frontal lifting
In forecasting precipitation, what does extrapolation work best for?
Short-period forecasting
Why are tops and bases of haze layers difficult to estimate?
Usually difficult to detect accurately
What is an example of an obstruction to visibility mentioned in the text?
Smog
How can one determine the height of haze layers according to the text?
Noting orientation to higher terrain, trees, or buildings
Why are pilot reports of haze tops and/or bases considered useful?
To aid in forecasting weather conditions
What is one condition that indicates the potential for radiation fog according to the text?
Low dew point depression
Why is satellite detection of dust challenging according to the text?
Challenges with night and single channel imagery
What role does the FSI play in indicating radiation fog potential?
Assessing stability and moisture levels in the atmosphere
How do Enhanced RGB satellite imagery and Aerosol Optical Depth help with dust detection?
Easing difficulties in satellite dust detection
What effect do slow wind speeds at 850 mb have on radiation fog potential?
Decrease the chance of mixing drier air into the fog layer
What is a key aspect of blowing dust forecasts produced by GEPS and MEPS?
Producing probability products for different visibilities
How do slow wind speeds at 850 mb contribute to the formation of radiation fog?
Inhibit mixing of drier ambient air into the fog layer
What is a key difficulty associated with satellite detection of dust according to the text?
Difficulty in distinguishing dust during nighttime hours
What type of conditions prevent the formation of radiation fog?
Strong breeze mixing with drier air aloft
What weather conditions are conducive to radiation fog formation?
Clear skies at night, light winds, and moist air near the surface
What factor can enhance radiation fog formation in valleys?
Cooling from cold air drainage
Under what conditions will light rainfall trigger the formation of ground fog?
Air becoming saturated near the ground
Why does a strong breeze prevent radiation fog formation?
Brings more moist air in contact with the cool surface
Which factor contributes to thickening of a fog layer in calm conditions?
Wind speeds of 3-7 knots bringing more moist air in contact with the cool surface
Learn about the weather hazards that can impact aviation, such as whiteout conditions and fog. Understand how these conditions affect visibility and safety during low-level flights and landings.
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