Com Weather 50-85

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.

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.

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 a temperature of 32°F or less.

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.

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

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.

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 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.

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.

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.

What visible signs indicate extreme turbulence in 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.

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 cloud is maximum.

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

During the life cycle of a thunderstorm, which stage is characterized predominately by downdrafts?. Mature. Developing. Dissipating.

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.

Which in-flight hazard is most commonly associated with warm fronts?. Advection fog. Radiation fog. Precipitation-induced fog.

Which is true regarding the use of airborne weather-avoidance radar for the recognition of certain weather conditions?. The radarscope provides no assurance of avoiding instrument weather conditions. The avoidance of hail is assured when flying between and just clear of the most intense echoes. The clear area between intense echoes indicates that visual sighting of storms can be maintained when flying between the echoes.

A situation most conducive to the formation of advection fog is. a light breeze moving colder air over a water surface. an air mass moving inland from the coastline during the winter. a warm, moist air mass settling over a cool surface under no-wind conditions.

Advection fog has drifted over a coastal airport during the day. What may tend to dissipate or lift this fog into low stratus clouds?. Nighttime cooling. Surface radiation. Wind 15 knots or stronger.

What lifts advection fog into low stratus clouds?. Nighttime cooling. Dryness of the underlying land mass. Surface winds of approximately 15 knots or stronger.

In what ways do advection fog, radiation fog, and steam fog differ in their formation or location?. Radiation fog is restricted to land areas; advection fog is most common along coastal areas; steam fog forms over a water surface. Advection fog deepens as windspeed increases up to 20 knots; steam fog requires calm or very light wind; radiation fog forms when the ground or water cools the air by radiation. Steam fog forms from moist air moving over a colder surface; advection fog requires cold air over a warmer surface; radiation fog is produced by radiational cooling of the ground.

With respect to advection fog, which statement is true?. It is slow to develop, and dissipates quite rapidly. It forms almost exclusively at night or near daybreak. It can appear suddenly during day or night, and it is more persistent than radiation fog.

Which feature is associated with the tropopause?. Constant height above the Earth. Abrupt change in temperature lapse rate. Absolute upper limit of cloud formation.

A common location of clear air turbulence is. In an upper trough on the polar side of a jet stream. near a ridge aloft on the equatorial side of a high-pressure flow. south of an east/west oriented high-pressure ridge in its dissipating stage.

The jet stream and associated clear air turbulence can sometimes be visually identified in flight by. dust or haze at flight level. long streaks of cirrus clouds. a constant outside air temperature.

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.

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.

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.

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

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.

The low-level wind shear Alert System (LLWAS) provides wind data and software process to detect the presence of a. rotating column of air extending from a cumulonimbus cloud. change in wind direction and/or speed within a very short distance above the airport. downward motion of the air associated with continuous winds blowing with an easterly component due to the rotation of the Earth.

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

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.

During an IFR cross-country flight you picked up rime icing which you estimate is 1/2" thick on the leading edge of the wings. You are now below the clouds at 2000 feet AGL and are approaching your destination airport under VFR. Visibility under the clouds is more than 10 miles, winds at the destination airport are 8 knots right down the runway, and the surface temperature is 3 degrees Celsius. You decide to. use a faster than normal approach and landing speed. approach and land at your normal speed since the ice is not thick enough to have any noticeable effect. fly your approach slower than normal to lessen the 'wind chill' effect and break up the ice.