Meteorology and Weather Services

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

Which action is recommended if jetstream turbulence is encountered with a direct headwind or tailwind?. Change altitude or course to avoid a possible elongated turbulent area. N/A. N/A.

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

Isobars on a surface weather chart represent lines of equal pressure. reduced to sea level. N/A. N/A.

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

What is indicated by the term 'embedded thunderstorms'?. Thunderstorms are obscured by other types of clouds. N/A. N/A.

What action is required prior to takeoff if snow is adhering to the wings of an air carrier airplane?. Assure that the snow is removed from the airplane. N/A. N/A.

A jet stream is a narrow, shallow, meandering river of maximum winds extending around the globe in a wavelike pattern with speeds of. 50 knots or greater. N/A. N/A.

Thrust is being managed to maintain desired indicated airspeed and the glideslope 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. N/A. N/A.

Which area or areas of the Northern Hemisphere experience a generally east to west movement of weather systems?. Arctic and subtropical. N/A. N/A.

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

What will be the wind and temperature trend for an STL MEM MSY flight at FL 330?. Windspeed decrease. N/A. N/A.

Forecast winds and temperatures aloft for an international flight may be obtained by consulting. Wind and Temperature Aloft Charts prepared by the U.S. National Centers of Environmental Prediction (NCEP). N/A. N/A.

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

Adiabatic warming is also described as. compressional heating. N/A. N/A.

What approximate wind direction, speed, and temperature (relative to ISA) are expected for a flight over MKC at FL260?. 260° true; 43 knots, ISA +10°C. N/A. N/A.

In comparison to an approach in a moderate headwind, which is an indication of a possible wind shear due to a decreasing headwind when descending on the glide slope?. Higher pitch attitude is required. N/A. N/A.

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

The rate of decrease in wind speed from the jet stream core is considerably greater on the. polar side. N/A. N/A.

Which event usually occurs after an aircraft passes through a front into the colder air?. Atmospheric pressure increases. N/A. N/A.

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

Embedded thunderstorms, which can be hazardous during instrument flight, are most likely to occur. in a warm front occlusion. N/A. N/A.

Anti-icing fluid should provide freezing point protection to. a freezing point no greater than 20°F below the ambient or airplane surface temperature. N/A. N/A.

What method was used to obtain the METAR at Tyler (KTYR) at 1753Z?. Automated Surface Observing System (ASOS), having a precipitation discriminator. N/A. N/A.

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

You are planning a flight to the West Coast of the United States, which is currently below the published weather minimums for an ILS approach to that airport. Winds are forecast to increase to above 20 knots from the west at your scheduled arrival time. What weather conditions should you expect?. A layer of low stratus or stratocumulus is expected. N/A. N/A.

Which type wind flows downslope becoming warmer and dryer?. Katabatic wind. N/A. N/A.

What information is provided by a Convective Outlook (AC)?. It provides prospects of both general and severe thunderstorm activity during the following 24 hours. N/A. N/A.

What condition is reported at Childress (KCDS)?. Light rain showers. N/A. N/A.

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

What term describes an elongated are of low pressure?. Trough. N/A. N/A.

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

Dew point fronts result from. air density differences due to the humidity levels. N/A. N/A.

What will be the wind and temperature trend for a DEN ICT OKC flight at 11,000 feet?. Windspeed increase slightly. N/A. N/A.

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. N/A. N/A.

Precipitation induced fog. results from relatively warm rain or drizzle falling through cooler air. N/A. N/A.

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

METAR KFSO 030856Z VRB02KT 7SM MIFG SKC 15/14 A3012 RMK SLP993 6 ///// T01500139 56012 In the above METAR, the SLP993 6 //// indicates. sea-level pressure 993.6 hectopascals and that an indeterminable amount of precipitation has occurred over the last 3 hours. N/A. N/A.

Where do squall lines most often develop?. Ahead of a cold front. N/A. N/A.

What action is recommended when encountering turbulence due to a wind shift associated with a sharp pressure trough?. Establish a straight course across the storm area. N/A. N/A.

The stability of an air mass can usually be determined by. cloud types and the type of precipitation. N/A. N/A.

When high level moisture is available, cirrus clouds form on the. equatorial side of the jet stream. N/A. N/A.

Where are jetstreams normally located?. In a break in the tropopause where intensified temperature gradients are located. N/A. N/A.

A clear are in a line of thunderstorm echoes on a radar scope indicates. an area where precipitation drops are not detected. N/A. N/A.

Atmospheric pressure changes due to a thunderstorm will be at the lowest value. when the thunderstorm is approaching. N/A. N/A.

What will be the wind and temperature trend for an SAT ELP TUS flight at 16,000 feet?. Wind direction shift from southwest to east. N/A. N/A.

Which action is recommended regarding an altitude change to get ou of jetstream turbulence?. Descend if ambient temperature is falling. N/A. N/A.

Which term applies when the temperature of the air changes by compression or expansion with no heat added or removed?. Adiabatic. N/A. N/A.

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. N/A. N/A.

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