Weather

Fog produced by frontal activity is a result of saturation due to. evcaporation of precipitation. N/A.

Which would increase the stability of an air mass?. Cooling from below. N/A.

Which conditions are favorable for the formation of a surface based temperature inversion?. Clear, cool nights with calm or light wind. N/A.

Ice pallets encountered during flight normally are evidence that. a warm front is about to pass. N/A.

A moist, unstabe air mass is characterized by. cumuliform clouds and showery precipitation. N/A.

Which is true regarding high or low pressure system?. A loe pressure area or trough is an area of rising air. N/A.

When conditionally unstable air with high moisture content and very warm surface temperature is forecast, one can expect what type of weather?. Strong updrafts and cumulunimbus clouds. N/A.

Which is true with respect to a high or low pressure system?. A high pressure area or ridge is an area of descending air. N/A.

The most severe weather conditions, such as destructive winds, heavy hail, and tornadoes, are generally associated with. squall lines. N/A.

What are the characteristics of an unstable atmosphere?. A warm, humid air mass. N/A.

Why does the wind have a tendency to flow parallel to the isobars above the friction level?. Coriolis force tends to counterbalance the horizontal pressure gradiant. N/A.

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. N/A.

The wind systrem associated with low pressure area in the northem hemisphere is. a cyclon and is caused by coriolis force. N/A.

You are avoiding a thunderstorm that is in your flighpath. You are over 20 miles from the cell however, you are under the anvil of the cell. is this a hazard?. Yes, hail can be discharged from the anvil. N/A.

Of the following, which is accurate regarding turbulance associated with thunderstorms?. Outside the cloud, shear turbulance can be encountered 20 miles laterally from a severe storm. N/A.

The strength and location of the jet stream is normally. weaker and farther north in the summer. N/A.

Low level wind shear may occur when. there is a lowlevel temperature inversion with strong winds above the inversion. N/A.

The presence of standing lenticular altocumulus clouds is a good indication of. very strong turbulance. N/A.

GIVEN: Wind at 3000 feet AGL 30kt Surface wind Calm While on approach for landing under clear skies with convetive turbulance a few hours after sunrise. one should. increase approach airspeed slightly above normal to avoid stalling. N/A.

Which would decrease the stability of an air mass?. Warming from below. N/A.

Which is true regarding the use of airborbe weather-avoidance radar for the recognition of certain weather conditions?. The radarscope provides no assurance of avoidance instrument weather conditions. N/A.

Which weather phenomenon signals the beginning of the mature stage of a thunderstorm?. The start of rain. N/A.

The general circulation of air associated with a high pressure area in the northem hemisphere is. Outward, downward and clockwise. N/A.

Which is a characteristic of stable air?. Restricted visibility. N/A.

During an approach, the most important and most easily recognized means of being alerted to possible wind shear is monitoring the. power and vertical velocity required to remain on the proper glidepath. N/A.

Density altitude is the vertical distance above mean sea level in the standard atmosphere at which. a given atmospheric density is to be found. N/A.

Thenderstorms identified as severe or giving an intense radar echo should be avoided by what distance?. At least 20 miles. N/A.

A strong wind shear can be expected. on the low pressure side of a jetstream core where the speed at the core is stronger than 110 knots. N/A.

What is indicated if ice pallets are encountered at 8000 feet?. Freezing rain at higer altitude. N/A.

Which statment is true concerning the hazards of hail?. Hailstones may be encountered in clear air several miles from a thunderstorm. N/A.

What is the approximate base of the cumulus clouds if the temperature at 2000 feet MSL is 10C and the dewpoint is 1C?. 6000 feet MSL. N/A.

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

What is an important characteristic of wind shear?. It can be present at any level and can exist in both horizontal and vertical direction. N/A.

During an IFR cross country flight you picked up rime icing which you estimatr 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 3C. You decide to. use faster than normal approach and landing speed. N/A.

The greatest threats to an aircraft operating in the vicinity of thunderstorms are. hail and turbulance. N/A.

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

Which is a characteristic typical of a stable air mass?. Continuous precipitation. N/A.

Which is true regarding actual air temperature and dewpoint temperature spread? The temperature spread. decreases as the relative humidity increases. N/A.

Which in flight hazard is most commonly associated with warm fronts?. precipitation induced fog. N/A.

What lifts advection fog into low stratus clouds?. Surfce winds of approximately 15 knots or stronger. N/A.

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 form over a water surface. N/A.

A common location of clear air turbulance is. in an upper trough on the polar side of the jet stream. N/A.

Virga is best described as. streamers of precipitation trailing beneath clouds which evaporates before reaching the ground. N/A.

If clouds form as a result of very stable, moist air being forced to ascend a montain slope, the clouds will be. stratus type with little vertical development and little or no turbulance. N/A.

Which combination of weather producing variables would likely result in cumuliform-type clouds, good visibility, and showery rain?. unstable, moist air and orographic lifting. N/A.

Hazardous wind shear is commonly encountered. in area of temperature inversion and near thunderstorm. N/A.

Refer to the excerpt from the following METAR report: KTUS 08004KT 4SM HZ 26/04 A2995 RMK RAE36 At approximately what altitude AGL should bases of convective type comuliform clouds be expected?. 8.800 feet. N/A.

During the life cycle of a thunderstorm, which stage is characterized predomitely by downdraft?. Dissipating. N/A.

With respect to advection fog, which statement is true ?. It can appear suddenly durinf day or night, and it is more persistement than radiation fog. N/A.

While flying cross country, in the Northem Hemisphere, you experiance a continuous left cross wind which is associated with a major wind system. This indicates that you. are flying toward an area of generally unfavorable weather conditions. N/A.

Convective currents are most active on warm summer afternoons when winds are. light. N/A.

What causes wind?. Pressure difference. N/A.

When flying low over hilly terrain, ridges, or montain ranges, the greatest potential danger from turbulent air currents will usually be encoutered on the. leeward side when flying into the wind. n/a.

When an air mass is stable, which of these conditions are most likely to exists?. Smoke, dust, haze, etc, concentrated at the lower level with resulting poor visibility. N/A.

The formation of either predominantntly stratiform or predominant cumuliform clouds is dependent upon the. stability of the air being lifted. N/A.

Every physical process of weather is accompanied by or is the result of. a heat exchange. N/A.

Which statment is true regarding squall lines?. They are nonfrontal and often contain severe, steady-state thunderstorms. N/A.

What are the characteristics of stable air ?. Poor visibility; steady precipitation; stratus clouds. N/A.

With regard to windflow patterns shown on surface analysis charts; when the isobars are. close together, the pressure gradient force is greater and wind velocities are stronger. N/A.

During the winter months in the middle latitudes, the jet stream shifts toward the. south ans speed increases. N/A.

The conditions most favorable to wave formation over montainous areas are a leyer of. stable air at mointaintop altitude and a wind of at least 20 knots blowing across the ridges. N/A.

When flying into a low presure area in the Northem Hemisphere, the wind direction and velocity will be from the. left and increasing. N/A.

There is a high pressure system that is located south of your planned route in the Northem Hemisphere on a west to east cross-country flight. To take advantage of favorable winds, you would plan your route. on the north side of the high pressure area. N/A.

From which measurement of the atmosphere can stability be determined?. The ambient lapse rate. N/A.

The jet stream and associated clear air turbulance can sometimes be visually identified in flight by. long streaks of cirrus clouds. N/A.

If a temperature inversion is encountered immediately after takeoff or during an approach to a landing, a potencial hazard exists due to. wind shear. N/A.

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

Which feature is associated with the tropopause?. Abrupt change in temperature lapse rate. N/A.

What feature is normlly associated with the cumulus stage of a thunderstorm?. Continuos updrafts. N/A.

Which is true regarding a cold front occlusion? The air ahead of the warm front. is warmer than the ir behind the overtaking cold front. N/A.

What determines the structure or type of clouds which will form as a result of air being forced to ascend ?. The stability ofthe air before lifting occurs. N/A.

The conditions necessary for the formation of cumulonimbus clouds are a lifting action and. unstable, moist air. N/A.

One of the most dangerous features on montain waves is the turbulent areas in and. beloe rotor clouds. N/A.

In the Northem Hemisphere, the wind is deflected to the. right by coriolis force. N/A.

Frost covering the upper surface of an airplane wing usually cause. the airplane to stall at an angle of attack that is lower than normal. N/A.

Moisture is added to air by. evaporation and sublimation. N/A.

Which are characteristics of a clod air mass moving aver a warm surface?. Cumuliform clouds, turbulance, and good visibility. N/A.

Which statment is true concerning squall lines?. they offer the most intense weather hazards to aircraft. N/A.

The low level wind shear Alert System (LLWAS) provides wind data ans software process to detect the presence of a. change in wind direction and or speed within a very short distance above the airport. N/A.

Which type of jetstream can be expected to cause the greater turbulance ?. A curving jetstream associated with a deep low pressure trough. N/A.

What type weather can one expect from moist, unstable air, and very warm susrface temperature?. Strong updrafts and cumulunimbus clouds. N/A.

What prevents air from flowing directly from high pressure areas to low pressure areas?. Coriolis force. N/A.

The conditions necessary for the formation of stratiform clouds are a lifting action and. stable, moist air. N/A.

Ice pallets encoutered during flight are normally evidence that. freezing rain exists at higher altitudes. N/A.

What is the characteristic of stable air ?. Stratiform clouds. N/A.

Hail is most likely to be associated with. cumulunimbus clound. N/A.

Advection fog has drifted over a coastal airport during the day. What may tend to dissipate or lift this fog into low stratus clouds. Wind 15 knots or stronger. N/A.

Which cloud types would indicate convective turbulance?. Towering cumulus clouds. N/A.

You have delayed your flight to allow a fast moving cold front to clear your destination airport before your arrival. What type of flying conditions would you expect after the font has passed?. A fast moving squall line with high winds and thunderstorms. N/A.

A situation most conducive to the formation of advevction fog is. an air mass moving inland from the coastline during the winter. N/A.

Select the true statment pertaining to the life cycle of a thunderstoms. The beginning of rain at the earths surface indicates the maute stage of the thunderstorm. N/A.

What visible signs indicate extreme turbulance in thunderstorms ?. Cumulunimbus clouds, very frequent lighting, and roll clouds. N/A.