WX ATP

Under what conditions would clear air turbulence (CAT) most likely be encountered?. When constant pressure charts show 20 knot isotachs less than 150 nm apart. X.

Doppler wind measurements indicate that the windspeed change a pilot may expect when flying through the peak intensity of a microburst is approximately. 45 knots. X.

Where is the normal location of the jetstream relative to surface lows and fronts?. The Jetstream is located north of the surface systems. X.

Which type cloud is associated with violent turbulence and a tendency toward the production of funnel clouds?. Cumulonimbus mammatus. X.

A PROB40 (PROBability) HHhh group in an International Terminal Aerodrome Forecast (TAF) indicates the probability of. Thunderstorms or other precipitation. X.

In the International Terminal Aerodrome Forecast (TAF), a variable wind direction is noted by 'VRB' where the three digit direction usually appears. A calm wind appears in the TAF as. 0000KT. X.

What is an important characteristic of wind shear?. It may be associated with either a wind shift or a windspeed gradient at any level in the atmosphere. X.

You are approaching an airport to land in 20 minutes. The METAR reports temperature 10 degrees C, dew point 10 degrees C, winds 310/04, scattered clouds and rain. You expect. Radiation fog. X.

Which atmospheric factor causes rapid movement of surface fronts?. Upper winds blowing across the front. X.

Refer to Figure 149.) What is the forecast temperature at ATL for the 3,000-foot level?. Not reported. X.

Precipitation induced fog. Results from relatively warm rain or drizzle falling through cooler air. X.

(Refer to Figure 145.) What weather improvement was reported at Lubbock (KLBB) between 1750 and 1818 UTC?. The vertical visibility improved by 2000 feet. X.

Forecast winds and temperatures aloft for an international flight may be obtained by consulting. Wind and temperature aloft chart prepared by the U.S. national centers of environmental prediction NCEP. X.

The tropopause is generally found when the free air temperatures are Between -55degC and -65degC. Between -55degC and -65degC. X.

Low pressure areas are areas of. Ascending air. X.

Which is a definition of 'severe wind shear'?. Any rapid change in wind direction or velocity wich causes air speed changes greater than 15 knots or vertical speed changes greater tha 500ft/min. X.

Which condition is present when a local parcel of air is stable?. The parcel of air resists convection. X.

What type turbulence should be reported when it momentarily causes slight, erratic changes in altitude and/or attitude, one-third to two-thirds of the time?. Intermittent light turbulence. X.

(Refer to Figure 149.) What will be the wind and temperature trend for a DEN ICT OKC flight at 11,000 feet?. Windspeed increase slightly. X.

Which area or areas of the Northern Hemisphere experience a generally east to west movement of weather systems?. Artic and subtropical. X.

(Refer to Figure 146.) What was the ceiling at Walnut Ridge (KARG)?. 1000 feet AGL. X.

The rate of decrease in wind speed from the jet stream core is considerably greater on the. Polar side. X.

During the life cycle of a thunderstorm, which stage is characterized predominately by downdrafts?. dissipating. X.

What is a feature of supercooled water?. The unstable water drop freezes upon striking an exposed object. X.

Thrust is being managed to maintain desired indicated airspeed and the glide slope is being flown. Which characteristics should be observed when a tailwind shears to a constant headwind?. PITCH ATTITUDE: increases. VERTICAL SPEED: Decreases. INDICATED AIRSPEED: Increases then decreases. X.

(Refer to Figure 145.) What condition is reported at Childress (KCDS)?. Light rain showers. X.

Vertical wind shear can be determined by comparing winds on vertically adjacent constant pressure charts. The vertical wind shear that is critical for probability of turbulence is. 6 knots or more per 1000 feet. X.

Which initial cockpit indications should a pilot be aware of when a constant headwind shears to a calm wind?. Altitude, pitch, and indicated airspeed decrease. X.

Which weather condition is present when the tropical storm is upgraded to a hurricane?. Sustained winds of 65 knots or more. X.

(Refer to Figure 146.) What method was used to obtain the METAR at Tyler (KTYR) at 1753Z?. ASOS having a precipitation discriminator. X.

You are planning a flight to a coastal area which is currently below published weather minimums for the ILS approach due to fog. The winds are forecast to increase to 20 knots from the west at your scheduled arrival time. What weather should you expect?. A low layer of stratus or stratocumulus clouds. X.

Which airplane performance characteristics should be recognized during takeoff when encountering a tailwind shear that increases in intensity?. Loss of, or diminished, airspeed performance. X.

What minimum thickness of cloud layer is indicated if precipitation is reported as light or greater intensity?. 4000 feet thick. X.

Freezing Point Depressant (FPD) fluids are highly soluble in water; however,. Ice is slow to absorb it, and to melt when in contact with it. X.

Turbulence encountered above 15,000 feet AGL, not associated with cloud formations, should be reported as. Clear air turbulence. X.

(Refer to Figure 149A Area 10.) What is the forecast wind direction, speed, and temperature over ELY at 30,000 feet?. 220 degrees, 35 knots , -33 degress C. X.

Isobars on a surface weather chart represent lines of equal pressure. Reduced to sea level. X.

Temperature and radiation variations over land with a clear sky typically lead to. Incoming terrestrial radiation peaking at noon. X.

SPECI KGLS 131802Z 10012G21KT 060V140 2SM +SHRA SCT005 BKN035 OVC050CB 24/23 A2980 RMK RAB57 WS TKO RW09L WSHFT 58 FROPA. This SPECI report at Galveston (KGLS) indicates which condition?. 5000 feet overcast with towering cumulus. X.

What is a characteristic of the troposphere?. There is an overall decrease of temperature with an increase of altitude. X.

What sources reflect the most accurate information on current and forecast icing conditions?. AIRMET ZULU. X.

What temperature condition is indicated if precipitation in the form of wet snow occurs during flight?. The temperature is about freezing at flight altitude. X.

A cyclone is. A hurricane force storm in the Indian ocean. X.

What weather difference is found on each side of a 'dry line'?. Dewpoint difference. X.

(Refer to Figure 149.) What will be the wind and temperature trend for a DSM LIT SHV flight at 12,000 feet?. Wind speed decrease. X.

Which INITIAL cockpit indications should a pilot be aware of when a constant tailwind shears to a calm wind?. Altitude , pitch , and indicated airspeed increase. X.

What is a difference between an air mass thunderstorm and a steady-state thunderstorm?. Air mass thunderstorm downdrafts and precipitation retard and reverse the updrafts. X.

Which is a disadvantage of the one-step over the two-step process when deicing/anti-icing an airplane?. More fluid is used with the one step method when large deposits of ice and snow must be flushed off airplane surfaces. X.

What type turbulence should be reported when it causes slight, rapid, and somewhat rhythmic bumpiness without appreciable changes in attitude or altitude, less than one-third of the time?. Occasional light chop. X.

Which wind-shear condition results in a loss of airspeed?. Decreasing headwind and increasing tailwind. X.

Which type weather conditions are covered in the Convective SIGMET?. Embedded thunderstorms, lines of thunderstorms, and thunderstorms with ¾ inch hail or tornadoes. X.

Freezing rain encountered during climb is normally evidence that. A layer of warmer air exists above. X.

A steady state thunderstorm is associated with. Weather systems. X.

Which wind-shear condition results in an increase in airspeed?. Decreasing tailwind and increasing headwind. X.

What is a feature of a stationary front?. Surface winds tends to flow parallel to the frontal zone. X.

Maximum turbulence potential charts (GTG-2) are issued. hourly. X.

Volcanic Ash Advisory charts are updated every. 6 hours. X.

Where is a common location for an inversion?. In the stratosphere. X.

What is the result when water vapor changes to the liquid state while being lifted in a thunderstorm?. Latent heat is released to the atmosphere. X.

What is the minimum glycol content of Type 1 deicing/anti-icing fluid?. 80 percent. X.

Cumulus clouds often indicate. Possible turbulence. X.

(Refer to Figure 145.) The peak wind at KAMA was reported to be from 320° true at 39 knots,. Wich occurred at 1743z. X.

What is the expected duration of an individual microburst?. Seldom longer than 15 minutes from the time the burst strikes the ground until dissipation. X.

All ATC facilities using radar weather processors with the ability to determine precipitation intensities will describe the intensity as. Light, moderate , heavy , extreme. X.

What is a feature of air movement in a high pressure area?. Descending to the surface and then outward. X.

(Refer to Figure 148.) Which system in the Convective SIGMET listing has the potential of producing the most severe storm?. The isolated storm 50 miles northeast of Memphis MEM. X.

What is the approximate rate unsaturated air will cool flowing upslope?. 3C per 1000 feet. X.

Atmospheric pressure changes due to a thunderstorm will be at the lowest value. When the thunderstorm is approaching. X.

(Refer to Figure 149.) What will be the wind and temperature trend for an STL MEM MSY flight at FL 330?. Windspeed decrease. X.

KFTW UA/OV DFW/TM 1645/FL100/TP PA30/SK SCT031-TOP043/BKN060-TOP085/OVC097-TOPUNKN/WX FV00SM RA/TA 07. This pilot report to Fort Worth (KFTW) indicates. The ceiling at KDFW is 6000 feet. X.

A severe thunderstorm is one in which the surface wind is. 58 mph or greater and /or surface hail is ¾ inch or more in diameter. X.

Which type clouds are indicative of very strong turbulence. Standing lenticular. X.

When you hear a SIGMET on an ATC frequency forecasting severe icing conditions on the route to your destination, you plan for. The possibility of freezing rain and freezing drizzle. X.

When saturated air moves downhill, its temperature increases. At slower rate than dry air because vaporization uses heat. X.

Which conditions result in the formation of frost?. Temperature of collecting surface is below the dewpoint and the dewpoint is also below freezing. X.

When will frost most likely form on aircraft surfaces?. On clear nights with stable air and light winds. X.

Which weather condition is an example of a nonfrontal instability band?. Squall line. X.

Clear air turbulence (CAT) associated with a mountain wave may extend as far as. 5000 feet above the tropopause. X.

Where do squall lines most often develop?. Ahead of a cold front. X.

The adverse effects of ice, snow, or frost on aircraft performance and flight characteristics include decreased lift and. An increased stall speed. X.

How are haze layers cleared or dispersed?. By wind or the movement of air. X.

Test data indicate that ice, snow, or frost having a thickness and roughness similar to medium or coarse sandpaper on the leading edge and upper surface of a wing can. REDUCE LIFT AS MUCH AS 30 percent and INCREASE DRAG BY 40 percent. X.

What weather feature occurs at altitude levels near the tropopause?. Maximum winds and narrow wind shear zones. X.

If a sample of air is forced upward and it is colder than the surrounding air, it. Sinks until it reaches denser air. X.

What is the primary cause of all changes in the Earth's weather?. Variations of solar energy at the earths surface. X.

Summer thunderstorms in the arctic region will generally move. Northeast to southeast in polar easterlies. X.

Which INITIAL cockpit indications should a pilot be aware of when a headwind shears to a calm wind?. Indicated airspeed decreases, aircraft pitches down , and altitude decreases. X.

On the constant pressure analysis chart, satellite and aircraft observations are used in the analysis, over areas of sparse data. A satellite observation plotted using. A star at the cloud top location. X.

Data that may be added (manual weather augmentation) to the Automated Weather Observing System (AWOS) report is limited to. Thunderstorms (intensity and direction), precipitation (type and intensity), and obstructions to visibility (dependent on the visibility being 3 miles or less). X.

In this METAR excerpt, "SLP993 SNINCR 1/10" means. There is 10” of snow on the ground with a 1 “ increase in the last hour. X.

On the constant pressure analysis chart, aircraft and satellite observations are used in the analysis over areas of sparse data. An aircraft observation is plotted using. A square at the aircraft location. X.

What weather condition occurs at the altitude where the dewpoint lapse rate and the dry adiabatic lapse rate converge?. Cloud bases form. X.

Why are downdrafts in a mature thunderstorm hazardous?. Downdrafts are kept cool by cold rain which tends to accelerate the downdraft velocity. X.

What is the lowest cloud in the stationary group associated with a mountain wave?. Rotor cloud. X.

What is indicated about an air mass if the temperature remains unchanged or decreases slightly as altitude is increased?. The air is stable. X.

A squall is a sudden increase of at least 15 knots in average wind speed to a sustained speed of. 20 knots or more for at least 1 minute. X.