Term
| Every physical process of weather is accompanied by, or is the result of, a |
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Definition
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Term
| A temperature inversion would most likely result in which weather condition? |
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Definition
| An increase in temperature as altitude is increased |
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Term
| The most frequent type of ground or surface-based temperature inversion is that which is produced by |
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Definition
| terrestrial radiation on a clear, relatively still night |
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Term
| Which weather conditions should be expected beneath a low-level temperature inversion layer when the relative humidity is high? |
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Definition
| Smooth air, poor visibility, fog, haze, or low clouds |
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Term
| Under which condition will pressure altitude be equal to true altitude? |
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Definition
| When standard atmospheric conditions exist. |
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Term
| Under what condition is pressure altitude and density altitude the same value? |
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Definition
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Term
| If a flight is made from an area of low pressure into an area of high pressure without the altimeter setting being adjusted, the altimeter will indicate |
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Definition
| lower than the actual altitude above sea level |
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Term
| Under what condition will true altitude be lower than indicated altitude? |
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Definition
| In colder than standard air temperature |
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Term
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Definition
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Term
| Which condition would cause the altimeter to indicate a lower altitude than true altitude? |
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Definition
| Air temperature warmer than standard |
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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 the surface. |
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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
| Clouds, fog, or dew will always form when |
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Definition
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Term
| What measurement can be used to determine the stability of the atmosphere? |
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Definition
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Term
| What would decrease the stability of an air mass? |
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Definition
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Term
| What is a characteristic of stable air? |
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Definition
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Term
| Moist, stable air flowing upslope can be expected to |
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Definition
| produce stratus type clouds |
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Term
| What feature is associated with a temperature inversion? |
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Definition
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Term
| What is the approximate base of the cumulus clouds if the surface air temperature at 1,000 feet MSL is 70 °F and the dewpoint is 48 °F? |
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Definition
6,000 feet MSL
-Take the difference between the temperature at the station and the dewpoint. 70 - 48 = 22°F In a convective current, temperature and dew point converge at about 4.4° F (2.5° C) per 1,000 feet. So divide the difference by 4.4 and multiplay by 1000. 22 / 4.4 = 5 5 * 1000 = 5000 AGL So the cloud base is 5000 feet above the station, which is 1000 feet MSL. Add this height to obtain the final height MSL. 5000 feet + 1000 feet = 6000 feet MSL |
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Term
| What are characteristics of a moist, unstable air mass? |
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Definition
| Cumuliform clouds and showery precipitation |
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Term
| What are characteristics of unstable air? |
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Definition
| Turbulence and good surface visibility |
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Term
| The suffix "nimbus,'' used in naming clouds, means |
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Definition
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Term
| Clouds are divided into four families according to their |
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Definition
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Term
| An almond or lens-shaped cloud 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
| What clouds have the greatest turbulence? |
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Definition
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Term
| What cloud types would indicate convective turbulence? |
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Definition
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Term
| The boundary between two different air masses is referred to as a |
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Definition
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Term
| One of the most easily recognized discontinuities across a front is |
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Definition
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Term
| One weather phenomenon which will always occur when flying across a front is a change in the |
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Definition
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Term
| Steady precipitation preceding a front is an indication of |
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Definition
| stratiform clouds with little or no turbulence |
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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
| 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
| 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 at least |
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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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Definition
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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 conditions necessary for the formation of cumulonimbus clouds are a lifting action and |
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Definition
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Term
| What feature is normally associated with the cumulus stage of a thunderstorm? |
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Definition
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Term
| 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
| 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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Definition
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Term
| Thunderstorms reach their greatest intensity during the |
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Definition
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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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Term
| 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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Definition
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Term
| Upon encountering severe turbulence, which flight condition should the pilot attempt to maintain? |
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Definition
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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
| 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
| 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 types of fog depend upon wind in order to exist? |
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Definition
| Advection fog and upslope fog |
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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
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Definition
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Term
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Definition
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Term
| These two cloud types are divided into four more groups that distinguish the cloud's altitude, WHAT ARE THEY? |
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Definition
| HIGH CLOUDS(20,000+FT), MIDDLE CLOUDS(6,500-20,000FT), LOW CLOUDS(up to 6,500 feet), AND VERTICAL CLOUDS(FORM AT MANY HIGHTS) |
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Term
| When stratus clouds contact the ground, they are called |
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Definition
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Term
| A long thin cloud which develops as the result of the passage of an aircraft at high altitudes |
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Definition
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