Weather Theory QZ2 Flashcards
(15 cards)
Possible mountain wave turbulence could be anticipated when winds of 40 knots or greater blow
1. down a mountain valley, and the air is unstable
2. across a mountain ridge, and the air is stable
3. parallel to a mountain peak, and the air is stable
- across a mountain ridge, and the air is stable
In which environment is aircraft structural ice most likely to have the highest accumulation rate?
1. Freezing drizzle
2. Cumulus clouds with below freezing temperatures
3. Freezing rain
- Freezing rain
An almond or lens-shaped cloud which appears stationary, but which may contain winds of 50 knots or more, is referred to as
1. a funnel cloud
2. a lenticular cloud
3. an inactive frontal cloud
- a lenticular cloud
The destination airport has one runway, 8-26, and the wind is calm. The normal approach in calm wind is a left-hand pattern to runway 8. There is no other traffic at the airport. A thunderstorm about 6 miles west is beginning its mature stage, and rain is starting to reach the ground. The pilot decides to
1. fly an approach to runway 26 since any unexpected wind due to the storm will be westerly
2. fly the normal pattern to runway 8 since the storm is west and moving north and any unexpected wind will be from the east or southeast toward the storm
3. fly the pattern to runway 8 since the storm is too far away to affect the wind at the airport
- fly an approach to runway 26 since any unexpected wind due to the storm will be westerly
Which weather phenomenon is always associated with a thunderstorm?
1. Hail
2. Heavy rain
3. Lightning
- Lightning
The mature stage of a thunderstorm begins with
1. continuous downdrafts.
2. the start of precipitation.
3. formation of the anvil top.
- the start of precipitation.
If the temperature/dewpoint spread is small and decreasing, and the temperature is 62°F, what type weather is most likely to develop?
1. Fog or low clouds
2. Freezing precipitation
3. Thunderstorms
- Fog or low clouds
The presence of ice pellets at the surface is evidence that there
1. is a temperature inversion with freezing rain at a higher altitude
2. has been cold frontal passage
3. are thunderstorms in the area
- is a temperature inversion with freezing rain at a higher altitude
Thunderstorms which generally produce the most intense hazard to aircraft are
1. steady-state thunderstorms
2. squall line thunderstorms
3. warm front thunderstorms
- squall line thunderstorms
When may hazardous wind shear be expected?
1. Following frontal passage when stratocumulus clouds form indicating mechanical mixing
2. In areas of low-level temperature inversion, frontal zones, and clear air turbulence
3. When stable air crosses a mountain barrier where it tends to flow in layers forming lenticular clouds
- In areas of low-level temperature inversion, frontal zones, and clear air turbulence
Where does wind shear occur?
1. At all altitudes, in all directions
2. Only at lower altitudes
3. Only at higher altitudes
- At all altitudes, in all directions
A pilot can expect a wind-shear zone in a temperature inversion whenever the wind speed at 2,000 to 4,000 feet above the surface is at least
1. 25 knots
2. 15 knots
3. 10 knots
- 25 knots
Which weather phenomenon signals the beginning of the mature stage of a thunderstorm?
1. Maximum growth rate of the clouds
2. The appearance of an anvil top
3. Precipitation beginning to fall
- Precipitation beginning to fall
Crests of standing mountain waves may be marked by stationary, lens-shaped clouds known as
1. standing lenticular clouds
2. roll clouds
3. mammatocumulus clouds
- standing lenticular clouds
One in-flight condition necessary for structural icing to form is
1. stratiform clouds
2. visible moisture
3. small temperature/dewpoint spread
- visible moisture
