Aviation Weather Exam Questions With All Correct Answers Rated A+

Aviation Weather Exam Questions With All Correct Answers Rated A+ How do you determine if you can fly locally? - Answer- Check METAR, TAF, Radar Forecast, NOTAMs How do you determine if you can fly cross country? - Answer- Review all the charts on aviation weather and 1800WXBrief What is IFR, MVFR, and VFR? - Answer- IFR ceilings 1,000' and visibility 3 miles. MVFR ceilings 1,000'-3,000' and visibility 3-5 miles. VFR ceilings 3,000' and visibility 5 miles What is an airmet? (three types) - Answer- Airmet Sierra - ifr and mountain obscuration Airmet Tango - Moderate turbulence, LLWS at the surface not in relation to convective activity, Surface winds greater than 30kts but less than 50kts Airmet Zulu - Moderate icing and freezing levels What is a sigmet? - Answer- Severe Icing Severe or Extreme Turbulence Dust storms and/or sand storms lowering visibilities to less than three (3) miles Volcanic Ash What is a convective sigmet? - Answer- Line of thunderstorms at least 60 miles long with thunderstorms affecting 40% of its length. Area of thunderstorms covering at least 40% of the area concerned and exhibiting a very strong radar reflectivity or a significant satellite or lightning signature. Embedded or severe thunderstorms expected to occur for more than 30 minutes. tornado hail greater than or equal to 3/4 inches in diameter wind gusts greater than or equal to 50 knots How do you contact a flight service station? - Answer- Tune to 122.2 or tune to an RCO and state who you are, where you are, 'receiving hampton vor' if that's what you are doing, and what you want Of the heat that reaches earth, how much gets reflected and how much gets absorbed? - Answer- "Of the heat that reaches earth, 55% gets reflected and 45% gets absorbed" What is diurnal temperature variation? - Answer- Diurnal temperature variation is the difference in temperature between day and night. What is the affect of high temperature on air density? - Answer- High temperature reduces air density and performance What creates local wind? - Answer- Diurnal and topographical temperature variations create local wind What is an effect of diurnal cooling? - Answer- Diurnal cooling is conducive to fog What type of dangerous precipitation can be caused by a temperature inversion? - Answer- An inversion aloft can cause rain to turn into freezing rain What problems can result from a ground based inversion? - Answer- A ground based inversion favors poor visibility by trapping haze, fog, and smoke at low altitudes What is 'hg'? - Answer- Hg is the abbreviation for Mercury -- inches of mercury are used to measure air pressure What is pressure altitude? - Answer- Pressure altitude - set the altimeter to 29.92Hg What is corrected altitude? - Answer- Corrected altitude - indicated altitude corrected for temperature What is indicated altitude? - Answer- indicated altitude - the altitude seen on the altimeter when set at the local pressure setting What is true altitude? - Answer- True altitude - height above sea level What is absolute altitude? - Answer- Absolute altitude - height above the ground What is density altitude? - Answer- Density altitude - pressure altitude corrected for non-standard temperature (the density altitude in the standard atmosphere where the air density is the same as where you are) How does a pressure gradient relate to wind? - Answer- The greater the difference between pressure gradients the stronger the wind What is the affect of the Coriolis force in the northern hemisphere? - Answer- The Coriolis force creates a counter-clockwise rotation in the northern Hemisphere deflected to the right What slows the wind? - Answer- Friction between the wind and the surface What is Katabatic wind? - Answer- Katabatic wind - wind blowing down an incline such as a mountain Which direction do sea breezes flow during the day? What about at night? - Answer- Sea breezes flow from sea to land during the day and from land to sea at night When the temperature dewpoint spread is less than what will you experience fog? - Answer- When the temperature-dewpoint spread is less than 5 degrees, you may experience fog What is relative humidity? - Answer- How much humidity air can hold at a certain temperature... its current saturation is the relative humidity. What is the minimum cloud height to produce significant precipitation? - Answer- To produce significant precipitation clouds are usually at least 4,000' tall or more What is the temperature lapse rate in the troposphere? - Answer- As air rises it cools 2 degrees celsius per 1,000'. What is the adiabatic lapse rate? - Answer- Adiabatic means 'a condition in which heat does not enter or leave the system concerned.' The adiabatic lapse rate could either be the saturated adiabatic lapse rate or the dry adiabatic lapse rate. What you need to know is the saturated adiabatic rate of cooling is slower than the dry adiabatic rate. What are some signs of unstable air? - Answer- Thunderstorms and dust devils are a sign of unstable air. If the temperature increases with altitude, this inversion may be a sign of unstable air. When air near the surface is warm and moist, expect instability. Cumulus clouds, unlimited visibility. Which way does the Coriolis effect cause a hurricane to spin in the northern hemisphere? - Answer- Counter-clockwise What are the 4 categories of clouds? - Answer- high clouds, middle clouds, low clouds, and clouds with extensive vertical development What does the prefix nimbo- or nimbus- mean? - Answer- Raincloud (e.g. nimbostratus or cumulonimbus) What are high clouds and what altitudes do they form? - Answer- High clouds are cirriform clouds (cirrus, cirocumulus, cirostratus) and form between 15,000-45,000' What are middle clouds and what altitudes do they form? - Answer- altostratus, altocumulus, and nimbostratus 6,500- 23,000'