COMMERCIAL PILOT - WEATHER

Of the following, which is accurate regarding turbulence associated with thunderstorms?. Outside the cloud, shear turbulence can be encountered 50 miles laterally from a severe storm. Shear turbulence is encountered only inside cumulonimbus clouds or within a 5-mile radius of them. Outside the cloud, shear turbulence can be encountered 20 miles laterally from a severe storm.

If airborne radar is indicating an extremely intense thunderstorm echo, this thunderstorm should be avoided by a distance of at least. 20 miles. 10 miles. 5 miles.

Which statement is true concerning squall lines?. They form slowly, but move rapidly. They are associated with frontal systems only. They offer the most intense weather hazards to aircraft.

What visible signs indicate extreme turbulence in the thunderstorms?. Base of the clouds near the surface, heavy rain, and hail. Low ceiling and visibility, hail, and precipitation static. Cumulonimbus clouds, very frequent lightning, and roll clouds.

Select the true statement pertaining to the life cycle of a thunderstorm. Updrafts continue to develop throughout the dissipating stage of a thunderstorm. The beginning of rain at the Earth's surface indicates the mature stage of the thunderstorm. The beginning of rain at the Earth's surface indicates the dissipating stage of the thunderstorm.

The most severe weather conditions, such as destructive winds, heavy hail, and tornadoes, are generally associated with. slow-moving warm fronts which slope above the tropopause. squall lines. fast-moving occluded fronts.

Which statement is true regarding squall lines?. They are always associated with cold fronts. They are slow in forming, but rapid in movement. They are nonfrontal and often contain severe, steady-state thunderstorms.

Hail is most likely to be associated with. cumulus clouds. cumulonimbus clouds. stratocumulus clouds.

Convective currents are most active on warm summer afternoons when winds are. light. moderate. strong.

Which situation would most likely result in freezing precipitation? Rain falling from air which has a temperature of. 32°F or less into air having a temperature of more than 32°F. 0°C or less into air having a temperature of 0°C or more. more than 32°F into air having temperature of 32°F or less.

During departure, under conditions of suspected low-level wind shear, a sudden decrease in headwind will cause. a loss in airspeed equal to the decrease in wind velocity. a gain in airspeed equal to the decrease in wind velocity. no change in airspeed, but groundspeed will decrease.

During an approach, the most important and most easily recognized means of being alerted to possible wind shear is monitoring the. amount of trim required to relieve control pressures. heading changes necessary to remain on the runway centerline. power and vertical velocity required to remain on the proper glidepath.

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 a tailwind. leeward side when flying into the wind. windward side when flying into the wind.

GIVEN: Winds at 3,000 feet AGL ......................................... 30 kts Surface winds .......................................................... Calm While on approach for landing under clear skies with convective turbulence a few hours after sunrise, one should. increase approach airspeed slightly above normal to avoid stalling. keep the approach airspeed at or slightly below normal to compensate for floating. not alter the approach airspeed, these conditions are nearly ideal.

If a temperature inversion is encountered immediately after takeoff or during an approach to a landing, a potential hazard exists due to. wind shear. strong surface winds. strong convective currents.

Which weather phenomenon signals the beginning of the mature stage of a thunderstorm?. The start of rain. The appearance of an anvil top. Growth rate of clouds is maximum.

Which statement is true concerning the hazards of hail?. Hail damage in horizontal flight is minimal due to the vertical movement of hail in the clouds. Rain at the surface is a reliable indication of no hail aloft. Hailstones may be encountered in clear air several miles from a thunderstorm.

What feature is normally associated with the cumulus stage of a thunderstorm?. Roll cloud. Continuous updraft. Beginning of rain at the surface.

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 20 knots blowing across the ridge. unstable air at mountaintop altitude and a wind of at least 20 knots blowing across the ridge. moist, unstable air at mountaintop altitude and a wind of less than 5 knots blowing across the ridge.

What minimum distance should exist between intense radar echoes before any attempt is made to fly between these thunderstorms?. 20 miles. 30 miles. 40 miles.

Low-level wind shear may occur when. surface winds are light and variable. there is a low-level temperature inversion with strong winds above the inversion. surface winds are above 15 knots and there is no change in wind direction and windspeed with height.

Frost covering the upper surface of an airplane wing usually will cause. the airplane to stall at an angle of attack that is higher than normal. the airplane to stall at an angle of attack that is lower than normal. drag factors so large that sufficient speed cannot be obtained for takeoff.

One of the most dangerous features of mountain waves is the turbulent areas in and. below rotor clouds. above rotor clouds. below lenticular clouds.

A strong wind shear can be expected. in the jetstream front above a core having a speed of 60 to 90 knots. if the 5°C isotherms are spaced between 7° to 10° of latitude. on the low-pressure side of a jetstream core where the speed at the core is stronger than 110 knots.

Which type of jetstream can be expected to cause the greater turbulence?. A straight jetstream associated with a low-pressure trough. A curving associated with a deep low-pressure trough. A jetstream occurring during the summer at the lower latitudes.

The strength and location of the jet stream is normally. weaker and farther north in the summer. stronger and farther north in the winter. stronger and farther north in the summer.

During the winter months in the middle latitudes, the jet stream shifts toward the. north and speed decreases. south and speed increases. north and speed increases.