Term
Every phsical process of weather is accompanied by, or is the sesult of, a...
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| What causes variations in altimeter settings between weather reporting points? |
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Definition
| Unequal heating of the Earth's surface |
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Term
| The wind at 5,000 feet AGL is southwesterly while the surface wind is southerly. This difference in direction is primarily due to |
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Definition
| friction between the wind and surface. |
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Term
| Convective circulation patterns associated with sea breezes are caused by |
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Definition
| cool, dense air moving inland from over the water. |
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| The development of thermal depends upon |
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Definition
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| The boundary between two different air masses is referred to as a |
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| One weather phenomenon which will always occur when flying across a front is a change in the |
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| One of the most easily recongnized discontinuities across a front is |
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| If there is thunderstorm activity in the vicinity of an airport at which you plan to land, which hazardous atmospheric phenomenon might be expected on the landing approach? |
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| A nonfrontal, narrow band of active thunderstorms that often develop ahead of a cold front is known as a |
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Definition
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Term
| What conditions are necessary for the formation of thunderstorms? |
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Definition
| High humidity, lifting force, and unstable conditions |
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Term
| During the life cycle of a thunderstorm, which stage is characterized predominately by downdrafts? |
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| Thunderstorms reach their greatest intensity during the |
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Definition
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| What feature is normally associated with the cumulus stage of a thunderstorm? |
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Definition
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| Which weather phenomenon signals the beginning of the mature stage of a thunderstorm? |
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Definition
| Precipitation beginning to fall |
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Term
| Thunderstorms which generally produce the most intense hazard to aircraft are |
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Definition
| squall line thunderstorms |
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| Which weather phenomenon is always associated with a thunderstorm? |
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Definition
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Term
| One in-flight condition necessary for structural icing to form is |
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Term
| In which environment is aircraft structural ice most likely to have the highest accumulation rate? |
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Definition
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Term
| The presence of ice pellets at the surface is evidence that there |
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Definition
| is a temperature inversion with freezing rain at a hight altitude. |
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Term
| An almond or lens-shaped clod which appears stationary, but which may contain winds of 50 knots or more, is referred to as |
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Definition
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Term
| Crests of standing mountain waves may be marked by stationary, lens-shaped clouds known as |
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Definition
| standing lenticular clouds |
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Term
| Possible mountain wave turbulence could be anticipated when winds of 40 knots or greater blow |
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Definition
| across a mountain ridge, and the air is stable. |
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Term
| Where does wind shear occur? |
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Definition
| At all altitudes, in all directions |
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Term
| A pilot can expect a wind-shear zone in a temperature inversion whenever the windspeed at 2,000 to 4,000 feet above the surface is a least |
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Definition
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Term
| When may hazardous wind shear be expected? |
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Definition
| In areas of low-level temperature inversion, frontal zones, and clear air turbulence |
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Term
| If the temperature/dewpoint spread is small and decreasing, and the temperature is 62 F, what type weather is most likely to develop? |
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Definition
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Term
| What is meant by the term "dewpoint"? |
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Definition
| The temperature to which air must be cooled to become saturated. |
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Term
| The amount of water vapor which air can hold depends on the |
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Definition
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Term
| What are the processes by which moisture is added to unsaturated air? |
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Definition
| Evaporation and sublimation |
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Term
| Which conditions result in the formation of frost? |
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Definition
| The temperature of the collecting surface is at or below the dewpoint of the adjacent air and the dewpoint is below freezing |
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Term
| Clouds, fog, or dew will always form when |
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Definition
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Term
| Low-level turbulence can occur and icing can become hazardous in which type of fog? |
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Definition
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Term
| In which situation is advection fog most likely to form? |
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Definition
| An air mass moving inland from the coast in winter. |
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Term
| What situation is most conducive to the formation of radiation fog? |
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Definition
| Warm, moist air over low, flatland areas on clear, calm nights |
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Term
| What types of fog depend upon wind in order to exist? |
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Definition
| Advection fog and upslope fog |
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