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Aviation Weather Questions and
Answers Graded A+
Select all characteristics that help define an airmass. ✔✔Uniform moisture content
Uniform Stability
Uniform temperature
If an airmass is colder then the ground it is moving over it is a classified as a ______________ ✔✔cold airmass
A maritime tropical airmass generally was what characteristics? ✔✔Warm temperature, high moisture content, high dew point
Typically, an advancing cold airmass has what kind of front on the leading edge? ✔✔Cold front
If flying through a warm front at higher altitudes, where will the position of the front aloft be in relation to its surface position? ✔✔On the cold side of the front
Select the 3 conditions that will always change when passing through a front regardless of the type of front. ✔✔A change in pressure
A change in wind direction or velocity
A change in temperature
While flying a cross country what type of wind conditions might indicate that you are flying towards worsening weather? ✔✔Continuous left cross wind
What what maximum sustained wind speed can a tropical storm be reclassified as a hurricane? ✔✔64 or more knots
A stable airmass typically presents what characteristics? ✔✔Poor visibility, not turbulent
Which term refers to a circulation with horizontal dimensions of 1 to 1,000 nautical miles? ✔✔Mesoscale
What is not an example of of mesoscale circulation? ✔✔Jetstream
Which is true about the polar front jet stream in the summer? ✔✔It is weaker and farther north
____________ is the process of H2O releasing latent heat and transitioning from water vapor to ice, skipping water. ✔✔Deposition
What is relative humidity? ✔✔measurement of the amount of water vapor actually present in the atmosphere when compared to the amount required for saturation.
At higher temperatures, saturation requires.... ✔✔more water vapor
What is the term that describes the temperature air must be cooled to become saturated? ✔✔Dewpoint
The three requirements for cloud formation are _________. ✔✔Condensation nuclei, water vapor, cooling.
What is cloud height reported in? ✔✔Above ground level (AGL)
If 3/8'ths of the sky is obscurred by clouds, sky condition will be reported as _________________. ✔✔Scattered
What would be the correct name for a rain cloud at low levels with extensive vertical development? ✔✔Cumulonimbus
In order for precipitation to occur what must be true. ✔✔Precipitation particles must be larger then cloud particles
What are all the causes of vertical motion? ✔✔Orography.
Fronts.
Covergence and divergence.
Convection.
What type of lifting is caused by a mountain pushing air aloft? ✔✔Orography.
Which is true about a parcel of air that is positively bouyant, when it is displaced upwards? ✔✔It will accelerate upwards and is unstable.
What causes the pressure gradient force in a sea breeze? ✔✔Differential heating.
What causes the coriolis effect? ✔✔Earth's rotation
Where will the coriolis effect cause the greatest deflection to the right? ✔✔The Poles
Why does geostrophic balance not occur in small scale circulations such as sea breezes or thunderstorms? ✔✔Pressure gradient force is greater than coriolis force.
What information can be obtained from isobars? ✔✔General wind direction and speed.
What causes the winds to generally increase in speed and change direction as altitude increases? ✔✔Surface friction.
What is absolute zero? ✔✔The temperature at which all molecular motion ceases.
Which weather phenomena is not associated with the tropopause level? ✔✔Hurricanes
__________ is the transfer of energy by electro magnetic waves ✔✔Radiatioin
__________ is the transfer of energy through molecular motion. ✔✔Conduction
__________ is the transfer of energy through vertical movement of mass ✔✔Convection
__________ is the transfer of energy through horizontal movement of mass ✔✔Advection
Which constant pressure chart would be the most accurate for you altitude, if your were flying at 4,500 ft. ✔✔850 millibar
A local wind is ______________? ✔✔A wind that relates to mesoscale cirulations
A sea breeze develops during the Day, the air will cirulate from the Water to the Land, this is caused by the land heating Quicker than the water resulting in a pressure difference. ✔✔
A valley Breeze will often be marked by what kind of clouds? ✔✔Cumulous
What is the internal circulation in dry convection called? ✔✔Vortex Ring
What is cloudy convection? ✔✔Saturated air that is rising because it is warmer than its surroundings.
What is the definition of a thunderstorm? ✔✔A local storm produced by a cumulonimbus cloud and is always accompanied by lightning and thunder.
What defines a severe thunderstorm? ✔✔Wind gusts of 50 knots or more and/or hail 3/4 of an inch or more in diameter and/or strong tornadoes.
What indicates the mature stage of a thunderstorm? ✔✔When precipitation induced downdrafts reach the ground and lightning and thunder begin.
What indicates the dissipating stage of a thunderstorm? ✔✔When there are predominantly downdrafts and rain.
How does a multicell thunderstorm differ from an airmass thunderstorm? ✔✔an airmass storm is only in one of the three stages at any given time where the multicell storm usually contains all three stages in one cluster.
What is needed for the development of a supercell thunderstorm? ✔✔Extreme instability and a special combination of boundary layer and upper level wind conditions.
Where do the strongest tornadoes occur in severe thunderstorms? ✔✔In the wall cloud
What causes the charge distribution in a thunderstorm and where are the positive and negative ions located? ✔✔Gravity and convection cause the positively charged ions to end up near the top of the cloud and the negatively charged ions to end up in the lower portion of the cloud.
What does the frequency of lightning indicate about the strength of a thunderstorm? ✔✔The more frequent the lightning, the stronger the thunderstorm.
What type of cloud is hail most likely to be associated with? ✔✔Cumulonimbus clouds.
What is an indication of strong turbulence above a thunderstorm? ✔✔Overshooting tops.
What is clear air turbulence? ✔✔Turbulence that occurs in the free atmosphere away from convective activity.
When should moderate mountain wave turbulence be expected? ✔✔When wind speeds are between 25 and 40 knots across the peaks.
Where is mountain wave turbulence usually the strongest? ✔✔In the first wave of the cycle.
What allows for carburetor icing to occur at temperatures well above freezing? ✔✔The intake air is cooled by expansion and fuel vaporization.
Why is structural icing detrimental to performance? ✔✔It causes a decrease in lift and an increase in drag
What is runback icing? ✔✔Ice that forms beyond the ice protection equipment
What ice accumulation rate is referred to as light icing? ✔✔A rate that may create a problem after one hour in the environment.
What is often the only direct observation of icing conditions? ✔✔PIREP
Between what temperatures does only clear ice form? ✔✔-0°C to -5°C
Why are super-cooled large droplets hazardous? ✔✔They are associated with heavy icing conditions and runback icing.
What does the presence of ice pellets indicate? ✔✔Freezing rain aloft
What weather conditions must prevail in order for an area to be reported as under IFR? ✔✔Ceilings from 500 feet to less than 1,000 feet and/or visibility of 1 s.m. to less than 3 s.m.
Which one of the following is not a way precipitation affects ceiling and visibility? ✔✔Advection fog caused by the cooling rain.
