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Radiation Fog
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Flight Instructor
Weather
| Question | Answer |
|---|---|
| Fog | Associated with warm front of saturation due to evaporation of precipitation. Temperature dewpoint seperation less than 5 degrees F. |
| Radiation Fog | Most likely to occur in high humidity early evening cool cloudless night wind and favorable topography |
| Advection Fog | Moving moist air over colder surface. It can appear suddenly during the day or night. More persistent than radiation fog. |
| Precipitation Induced Fog | Is formed as a result of saturation due to evaporation of precipitation. Associated with warm fronts |
| Trough | Low pressure area rising air |
| Troposphere | part of the atmosphere where most weather occurs. It's the layer from the surface to an average altitude of 7 miles. |
| Dew Point | the temperature at which the air will have 100% relative humidity/be saturated |
| Standard Temperature | Sea level is 15 degrees C (59 F) |
| Standard Pressure | 29.92 in. Hg (1013.2 mb) |
| Stable Air Characteristics | 1. Stratiform clouds 2. Smooth air 3. Fog 4. Continuous precipitation 5. Restriction visibility haze and smoke |
| Unstable Air Characteristics | 1. Cumuliform clouds 2. Turbulent air 3. Good visibility except blowing sand or snow 4. Showery precipitation |
| Weather Fronts (1) | 1. Frontal waves normally form on slow-moving cold fronts or stationary fronts. |
| Weather Fronts (1a) | 1a. If a frontal wave were to form on a stationary front running east & west across the US, that portion east of the wave would normally become a warm front & that portion west of the wave would become a cold front |
| Weather Fronts (2) | The weather associated with an advancing warm front that has moist, unstable air is cumuliform clouds, turbulent air, and showery-type precipitation. |
| Weather Fronts (3) | In a cold front occlusion, the air ahead of the warm front is warmer than the air behind the overtaking cold front. An occlusion is composed of two fronts as a cold front overtakes a warmer front. |
| The windflow around a low pressure is | cyclonic |
| Convective circulation patterns associated with sea breezes are caused by | land absorbing and radiating heat faster than the water |
| Thermals | Strong thermals have proportionately increased sink in the air between them |
| What is an operational consideration regarding actual air temperature and dewpoint temperature spread? | The temperature spread decreases as the relative humdiity increases |
| Fog associated with a warm front is a result of saturation due to | evaporation of precipitation |
| Radiation fog is most likely to occur under what conditions? | High humidity during the early evening, cool cloudless night with light winds, and favorable topography |
| Advection fog is formed as a result of | moist air moving over a colder surface |
| When can advection fog appear? | Suddenly during the day or night, and it is more persistent than radiation fog |
| Which in-flight hazard is most commonly associated with warm fronts? | precipitation-induced fog |
| What are the standard temperature and pressure values for mean sea level? | 59 F and 1013.2 mb |
| The most frequent type of ground or surface based temperature inversion is that produced by | terrestrial radiation on a clear, relatively still night |
| What is a typical characteristic of a stable air mass? | Continuous precipitation |
| If clouds form as a result of very stable, moist air being forced to ascend a mountain slope, the clouds will be | stratus type with little vertical development and little or on turbulence |
| Frontal waves normally form on | slow-moving cold fronts or stationary fronts |
| If a wave were to form on a stationary front running east and west across the US, that portion of the east wave would normally | become a warm front and that portion of the west wave would become a cold front |
| Name a true statement regarding a cold front occlusion | The air ahead of the warm front is warmer than the air behind the overtaking cold front |
| When flying low over hilly terrain, ridges, or mountain ranges, the greatest potential danger from turbulent air currents will usually be encountered on the | leeward side when flying with the wind |
| The conditions most favorable to wave formation over mountainous areas are a layer of | stable air at mountaintop altitude and a wind of at least 15 to 25 knots blowing across the ridge |
| What are the minimum requirements for the formation of a thunderstorm? | Sufficient moisture, an unstable lapse rate, and lifting action |
| What is the expected duration of an individual microburst? | Seldom longer than 15 minutes from the time the burst strikes the ground until disipation |
| How long do the maximum intensity winds last in an individual microburst? | 2 to 4 minutes |
| Name characteristics regarding hail as an in-flight hazard | Large hail is most commonly found in thunderstorms which have strong updrafts and large liquid water content. Hail is usually produced during the mature stage of the thunderstorm's lifespan. Hailstones thrown upward and outward for several miles |
| The most rapid accumulation of clear ice on an aircraft in flight may occur with temperatures between 0 degrees C-15 degrees C in | cumuliform clouds |
| One of the best visual indications of a thermal is a | smooth cumulus cloud with a concave base |
Created by:
samshakib