Aviation Meteorology
Low level wind shear is a change in wind speed of _____ knots or more within ____ feet of AGL.
10 knots ; 2,000 feet
Which effect occurs to airplanes on departure during a high density altitude condition?
A longer landing roll is required
Water vapor, lift, and unstable air are necessary for the formation of _________.
A thunderstorm cell
What type of air mass produces stable air that is associated with smooth air, poor visibility, and stratiform clouds?
A warm air mass moving over a cold surface
Light turboprop aircraft are more susceptible to icing than commercial jet aircraft because they typically fly ____
At lower altitudes
What National Weather Service office provides meteorological forecasts and advice to ARTCCs and other FAA facilities regarding weather impact on their missions?
Center Weather Service Unit (CWSU)
Air flow around a high diverges in a ________ motion and ________, causing the air to compress and warm, which tends to dissipate clouds.
Clockwise ; Sinks
What type of clouds look like fluffy cotton balls or heaps, indicate upward vertical motion or thermal uplift of air, and can produce severe turbulence, icing, and other hazards?
Cumuliform
Which of the following is not true regarding fog?
Fog forms slowly, allowing pilots to avoid this hazard
Which airplane would be at risk from a 25 knot crosswind on landing?
General Aviation, single propeller
Precipitation formation requires water vapor, lift, and a _____
Growth Process
What type of precipitation occurs when there is a shallow layer aloft above freezing temperatures, with a deep layer of below freezing air based at the surface?
Ice Pellets
Which of the following is a characteristic of a temperature inversion?
Increased temperatures with increased altitude
What type of turbulence is caused by any obstruction to the wind, such as buildings or mountains?
Mechanical
A sudden wind shift, even at low speeds, can be hazardous on takeoff and landing because it can what?
Quickly become a crosswind or tailwind
The ratio of water vapor in the air compared to the amount of water vapor the air can hold at a particular temperature and pressure is the definition of _________.
Relative humidity
There are three types of icing what are they?
Rime, Clear , and Mixed
What type of turbulence causes occupants to be forced violently against seat belts or shoulder straps, unsecured objects to be tossed about, and makes food service and walking impossible?
Severe
When de-icing or anti-icing equipment fails to reduce or control the icing hazard, the icing is categorized as what?
Severe
Within which layer of the atmosphere does temperature increase with altitude, making it a stable layer, generally devoid of significant weather?
Stratosphere
When the ________ is greater than zero, the air is unsaturated.
Temperature-Dew Point Spread
Which stage of a thunderstorm is characterized by updrafts exceeding 3,000 feet per minute?
Towering cumulus
Virtually all aircraft fly in which two layers of the atmosphere?
Troposphere and Stratosphere
Severe damage can occur if ________ is ingested into an engine.
Volcanic ash
Which front is associated with poor visibility, smooth air, and steady precipitation?
Warm
A sinking parcel of air compresses and ________ as it encounters increasing pressure; this causes a cloud to quickly ________.
Warms ; Dissipate
Which gas constitutes only a small percentage of the earth's atmosphere and varies widely in both time and space, ranging from trace amounts to 4 percent by volume?
Water Vapor
Standard atmosphere in NOT used for ______
Weather observations
Warm wind going one way and cold wind going another would be called what?
Wind Shear
An area as large as 10 miles or more of strong damaging winds reaching speeds as high as 120 knots, on or near the ground, is a ________.
downburst
Airplane performance gradually degrades as the wind _____
turns perpendicular to the runway
