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Weather aviation
Section A
| Question | Answer |
|---|---|
| What causes variation in altimeter settings between weather reporting points ? | Unequal heating of Earth's surface. |
| The wind at 5000 feet AGL is southwesterly while the surface win is southerly. This difference in direction is primarily due to | Friction between the wind and the surface |
| Convective circulation patterns associated with sea breezes are caused by | Cool, dense air moving inland from over the water |
| How will frost on the wings of an airplane affect take off performance? | Frost will disrupt the smooth flow of air over the wing, adversely affecting its lifting capability. |
| Every physical process of weather is accompanied by, or is the result of, a | heat exchange |
| A temperature inversion would most likely result in which weather condition? | An increase in temperature as altitude is increase. |
| Th most frequent type of ground or surface based temperature inversion is that which is produced by | terrestrial radiation on a clear, relatively still night. |
| Which weather conditions should be expected beneath a low level temperature inversion layer when the relative humidity is high? | Smooth air, poor visibility, fog haze, or low clouds. |
| What is meant by the tern "dewpoint"? | the temperature to which air must be cooled to become saturated. |
| The amount of water vapor which air can hold depends on the | air temperature |
| Clouds, fog, or dew will always form when | Water vapor condenses. |
| What are the processes by which moisture is added to unsaturated air? | Evaporation and sublimation. |
| Which conditions result in the formation of frost? | The temperature of the collecting surface is at or below the dewpoint of the adjacent air and the dewpont is below freezing. |
| The presence of ice pellets at the surface is evidence that there | is a temperature inversion with freezing rain at a higher altitude. |
| What measurement can be used to determine the stability of the atmosphere? | Actual lapse rate. |
| What would decrease the stability of an air mass? | Warming from below. |
| What is a characteristic of stable air | Stratiform clouds |
| Moist, stable air flowing upslope can be expected to | produce stratus type clouds. |
| if an unstable air mass is forced upward, what type clouds can be expected? | Clouds with considerable vertical development and associated turbulence. |
| What feature is associated with a temperature inversion? | A stable layer of air. |
| What is the approximate base of the cumulus clouds if the surface air temperature at 1000 feet MSL is 70 F and the dew point is 48 F | 6000 feet MSL. |
| At approximately what altitude above the surface would the pilot expect the base of cumuliform clouds if the surface air temperature is 82 F and the dew point is 38 F | 10000 feet. |
| What are characteristics of unstable air? | Turbulence and good surface visibility. |
| A stable air mass is most likely to have which characteristic? | smooth air. |
| The suffix" nimbus" used in naming clouds, means | a rain cloud. |
| Clouds are divided into four families according to their | height range. |
| The boundary between two different air masses is referred to as a | front |
| One of the most easily recognized discontinuities across a front is | a change in temperature. |
| One weather phenomenon which will always occur when flying across a front is change in the | wind direction |
| steady precipitation preceding a front is an indication of | stratiform clouds with little or no turbulence |
| What situation is most conducive to the formation of radiation fog | warm, moist air over low, flatland areas on clear, calm nights. |
| It the temperature/dewpoint spread is small and decreasing, and the temperature is 62 F, what type weather is most likely to develop? | Fog or low clouds. |
| In which situation is advection fog most likely to form? | An air mass moving inland from the coast in winter |
| What types of fog depend upon wind in order to exist? | Advection fog and upslope fog. |
| Low level turbulence can occur and icing can become hazardous in which type of fog? | Stem fog. |
Created by:
minhly