WEATHER QUIZ 1 Flashcards
Freezing rain encountered during a climb is usually indicative of what?
A layer of warmer air above. Rain or drizzle always forms in temperatures above freezing. Rain or drizzle falling thru colder air may become super cooled, freezing on impact as freezing rain
A layer of warmer air above. Rain or drizzle always forms in temperatures above freezing. Rain or drizzle falling thru warmer air may become super cooled, freezing on impact as freezing rain.
A layer of colder air above. Rain or drizzle always forms in temperatures above freezing. Rain or drizzle falling thru colder air may become super cooled, freezing on impact as freezing rain.
A layer of warmer air above. Rain or drizzle always forms in temperatures above freezing. Rain or drizzle falling thru colder air may become super cooled, freezing on impact as freezing rain
What shows up best on radar? Rain, Wet Hail, Sleet, Snow. Sleet. Snow. Wet Hail. Rain.
Wet Hail.
After passing through into a cold front, will atmospheric pressure typically increase or decrease?
remain the same
When crossing a front directly into colder air, the pressure will usually drop
When crossing a front directly into colder air, the pressure will usually rise
When crossing a front directly into colder air, the pressure will usually rise
In what condition will snowflakes form?
By sublimation in below freezing temperatures.
By kinetic cooling in below freezing temperatures.
By sublimation in above freezing temperatures.
By sublimation in below freezing temperatures.
What is the definition of wind shear?
Any rapid change in wind direction or velocity which causes airspeed changes greater than 8 knots or vertical speed changes greater than 500 feet per minute.
Any rapid change in wind direction or velocity which causes airspeed changes greater than 15 knots or vertical speed changes greater than 500 feet per minute.
Any rapid change in wind direction or velocity which causes airspeed changes greater than 5 knots or vertical speed changes greater than 500 feet per minute.
Correct
Any rapid change in wind direction or velocity which causes airspeed changes greater than 15 knots or vertical speed changes greater than 500 feet per minute.
Are METAR winds reported in relation to magnetic or true north?
It depends on the station.
True north.
Magnetic North.
True north.
Describe advection fog.
Forms day or night as a result of dry air moving over a cold surface.
Forms day or night as a result of moist air moving over a cold surface.
Forms day or night as a result of moist air moving over a hot surface.
Forms day or night as a result of moist air moving over a cold surface.
Describe radiation fog…
High humidity during the early evening Cool cloudless nights with strong winds Favorable topography
High humidity during the early evening Cool cloudless nights with light winds Favorable topography
Low humidity during the early evening Cool cloudless nights with light winds Favorable topography
High humidity during the early evening Cool cloudless nights with light winds Favorable topography
Squall lines are typically found ahead of cold or warm fronts?
Typically associated with cold fronts. However, squall lines can form during the summer month as far as 200 miles in advance of a severe cold front.
Typically associated with warm fronts. However, squall lines can form during the summer month as far as 200 miles in advance of a severe cold front.
Typically associated with cold fronts. However, squall lines can form during the summer month as far as 200 miles in advance of a severe cold front.
What is the definition of severe icing?
When the rate of ice accumulation on an aircraft is such that de-icing/anti-icing equipment fails to reduce or control the hazard.
When the rate of ice accumulation on an aircraft is such that de-icing/anti-icing equipment is able to keep up but is working hard.
When the rate of ice accumulation on an aircraft is such that passengers ask flight attendants about it.
When the rate of ice accumulation on an aircraft is such that de-icing/anti-icing equipment fails to reduce or control the hazard.
How far should you fly around a thunderstorm?
Avoid any thunderstorms identified as severe or giving an intense radar echo by at least 20 miles if circumnavigating or clear the top of the storm by 5000 feet for every 10 knots of wind speed at the top of the storm if flying over the top.
Avoid any thunderstorms identified as severe or giving an intense radar echo by at least 50 miles if circumnavigating or clear the top of the storm by 1000 feet for every 10 knots of wind speed at the top of the storm if flying over the top.
Avoid any thunderstorms identified as severe or giving an intense radar echo by at least 20 miles if circumnavigating or clear the top of the storm by 1000 feet for every 10 knots of wind speed at the top of the storm if flying over the top.
Avoid any thunderstorms identified as severe or giving an intense radar echo by at least 20 miles if circumnavigating or clear the top of the storm by 1000 feet for every 10 knots of wind speed at the top of the storm if flying over the top.
Mountain waves can produce stationary cloud group of rotor clouds and standing lenticular clouds. Pick one of the two, which are usually found at lower altitudes?
Rotor clouds are likely to be the lowest.
Standing lenticular.
Rotor clouds are likely to be the lowest.
What is a microburst? What is a dry microburst?
Microbursts are small-scale intense downdrafts which, on reaching the surface, spread inward in limited directions from the downdraft center. A dry microburst often generates a ring of dust on the surface. A microburst is defined if damaging winds extend to 2.2 miles or less horizontally.
Microbursts are small-scale intense updrafts which, on reaching the surface, spread outward in all directions from the downdraft center. A dry microburst often generates a ring of dust on the surface. A microburst is defined if damaging winds extend to 2.2 miles or less horizontally.
Microbursts are small-scale intense downdrafts which, on reaching the surface, spread outward in all directions from the downdraft center. A dry microburst often generates a ring of dust on the surface. A microburst is defined if damaging winds extend to 2.2 miles or less horizontally.
Microbursts are small-scale intense downdrafts which, on reaching the surface, spread outward in all directions from the downdraft center. A dry microburst often generates a ring of dust on the surface. A microburst is defined if damaging winds extend to 2.2 miles or less horizontally.
What are the parameters that define wind shear?
Wind shear is defined as “any rapid change in wind direction or velocity.” Severe wind shear is defined as a rapid change in wind direction or velocity causing air speed changes greater than 20 knots or vertical speed changes greater than 500 feet per minute.
Wind shear is defined as “any rapid change in wind direction or velocity.” Severe wind shear is defined as a rapid change in wind direction or velocity causing air speed changes greater than 15 knots or vertical speed changes greater than 1000 feet per minute.
Wind shear is defined as “any rapid change in wind direction or velocity.” Severe wind shear is defined as a rapid change in wind direction or velocity causing air speed changes greater than 15 knots or vertical speed changes greater than 500 feet per minute.
Wind shear is defined as “any rapid change in wind direction or velocity.” Severe wind shear is defined as a rapid change in wind direction or velocity causing air speed changes greater than 15 knots or vertical speed changes greater than 500 feet per minute.
A process of cooling the air through expansion is better known as…
Adiabatic cooling.
Adiabatic warming
kinetic cooling
Adiabatic cooling.
How can the stability of the atmosphere be determined?
The best indication of the stability or instability of an air mass is the ambient moisture.
The best indication of the stability or instability of an air mass is the pressure rate.
The best indication of the stability or instability of an air mass is the ambient temperature lapse rate.
The best indication of the stability or instability of an air mass is the ambient temperature lapse rate.
What percentage of cloud cover is scattered?
Scattered (SCT) is defined as 3/8 to 4/8 coverage.
Scattered (SCT) is defined as 1/3 to 3/8 coverage.
Scattered (SCT) is defined as 1/2 to 4/8 coverage.
Scattered (SCT) is defined as 3/8 to 4/8 coverage.
Where can the maximum hazard zone caused by wind shear associated with a thunderstorm be found?
Upwind side and directly under the thunderstorm.
On all sides and directly under the thunderstorm.
East side and directly under the thunderstorm.
On all sides and directly under the thunderstorm.
CAT is best predicted where horizontal wind shear exceeds what values? Exceeds10 knots per 150 NM. Exceeds 20 knots per 40NM. Exceeds15 knots per 150 NM. Exceeds 40 knots per 150 NM.
Exceeds 40 knots per 150 NM.
What is the worst icing condition?
Freezing hail.
Freezing Fog.
Freezing Rain (FZRA) and Freezing Drizzle (FZDZ).
Freezing Rain (FZRA) and Freezing Drizzle (FZDZ).
You experience wind shear on final, what is the best course of action?
Decrease pitch attitude, increase power to the maximum available and accept lower than normal airspeed indications. If this does not arrest the descent, the pilot should continue to pitch up until the descent stops or until the “stick shaker” is encountered.
Maintain or increase pitch attitude, decrease power to the maximum available and accept lower than normal airspeed indications. If this does not arrest the descent, the pilot should continue to pitch up until the descent stops or until the “stick shaker” is encountered.
Maintain or increase pitch attitude, increase power to the maximum available and accept lower than normal airspeed indications. If this does not arrest the descent, the pilot should continue to pitch up until the descent stops or until the “stick shaker” is encountered.
Maintain or increase pitch attitude, increase power to the maximum available and accept lower than normal airspeed indications. If this does not arrest the descent, the pilot should continue to pitch up until the descent stops or until the “stick shaker” is encountered.
Winds aloft are 270/20, they shift to 210/15, have you experienced frontal passage?
Yes, even though shifts are usually to the right after passage.
No, even though shifts are usually to the right after passage.
Yes, even though shifts are usually to the right after passage.
What are the dynamics of a low pressure system?
Air flows from areas of high pressure into areas of low pressure because air always seeks out lower pressure. In the northern hemisphere, the air flows toward a low and is deflected to create a counterclockwise or cyclonic circulation. The air flows into a high pressure area to replace rising air this air tends to be unstable, and usually brings increasing cloudiness and precipitation.
Air flows from areas of high pressure into areas of low pressure because air always seeks out lower pressure. In the northern hemisphere, the air flows toward a low and is deflected to create a counterclockwise or cyclonic circulation. The air flows into a low-pressure area to replace rising air this air tends to be unstable, and usually brings increasing cloudiness and precipitation.
Air flows from areas of low pressure into areas of low pressure because air always seeks out lower pressure. In the northern hemisphere, the air flows toward a low and is deflected to create a counterclockwise or cyclonic circulation. The air flows into a low pressure area to replace rising air this air tends to be unstable, and usually brings increasing cloudiness and precipitation.
Air flows from areas of high pressure into areas of low pressure because air always seeks out lower pressure. In the northern hemisphere, the air flows toward a low and is deflected to create a counterclockwise or cyclonic circulation. The air flows into a low-pressure area to replace rising air this air tends to be unstable, and usually brings increasing cloudiness and precipitation.
What type of weather report would you find CAT on?
Clear Air Turbulence Forecast – CAT (1 and 3 hrs. US Forecast).
Clear Air Turbulence Forecast – CAT (3 and 6 hrs. US Forecast).
Clear Air Turbulence Forecast – CAT (8 and 10 hrs. US Forecast).
Clear Air Turbulence Forecast – CAT (3 and 6 hrs. US Forecast).
