Formation of Ice Pellets (Sleet) Quiz
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Questions and Answers

In what seasons are Northern latitudes more likely to have cloudy skies and a higher chance of precipitation?

  • Summer and Fall (correct)
  • Fall and Winter
  • Winter and Spring
  • Spring and Summer

    • What is Ice Fog?

  • A Cirrus cloud on the ground.
  • Fog that will freeze to your aircraft on contact if flown through.
  • Fog that is created by ice sublimating into water vapor, and then condensing into liquid.
  • Fog that is created by ice melting into water, and then evaporating into water vapor. (correct)

    • Why do Single-Cell Thunderstorms dissipate fairly quickly?

  • Because the precipitation-induced Downdrafts cut off the Updrafts (correct)
  • Because the airmass isn't humid enough to support continued growth
  • Because the Unstable Lapse Rate no longer exists
  • Because the initial Lifting Action stops

    • How does a Thunderstorm form large Hail?

    <p>Strong downdrafts in the storm accelerate the speed of the hail towards the Earth, allowing the hail to grow through collision and coalescence.</p> Signup and view all the answers

    What condition must the atmosphere meet to exhibit 'Absolute Instability'?

    <p>Cool at twice the rate of the Dry Adiabatic Lapse Rate</p> Signup and view all the answers

    Why is it important to understand how wind affects atmospheric stability?

    <p>Because wind movements influence the density and behavior of rising air parcels</p> Signup and view all the answers

    How does vertical air motion affect atmospheric stability?

    <p>Rising air columns become more unstable because the top expands and cools more than the bottom</p> Signup and view all the answers

    What happens when warm air is moved to the bottom and cold air to the top of an airmass?

    <p>Rising air parcels become warmer and less dense, continuing to rise</p> Signup and view all the answers

    What type of vertical atmospheric temperature structure is required for the formation of Ice Pellets (Sleet)?

    <p>Below freezing at formation in the cloud, with a colder Below freezing layer beneath the cloud, and finally another Below freezing layer just above the Earth's surface.</p> Signup and view all the answers

    In what vertical atmospheric temperature structure does Freezing Rain form at the Earth's surface?

    <p>Freezing Rain requires a more shallow/thinner Above-Freezing layer prior to reaching the Earth's surface.</p> Signup and view all the answers

    What happens to the temperature as you move vertically in the atmosphere for Ice Pellets (Sleet) formation?

    <p>It starts below freezing, then goes above freezing, and finally back to below freezing just above the Earth's surface.</p> Signup and view all the answers

    What is the significance of the atmospheric temperature structure for the formation of Freezing Rain?

    <p>A warmer Above-Freezing layer is required within the cloud.</p> Signup and view all the answers

    Which condition is essential for Ice Pellets (Sleet) formation that distinguishes it from Freezing Rain?

    <p>A thick layer of freezing temperatures close to Earth's surface.</p> Signup and view all the answers

    What type of vertical atmospheric temperature structure does Ice Pellets (Sleet) NOT require for its formation?

    <p>A consistently warm temperature throughout.</p> Signup and view all the answers

    How does the top of a rising column of air differ from the bottom?

    <p>It expands more and cools more</p> Signup and view all the answers

    What effect do diurnal temperature changes have on atmospheric stability?

    <p>Decreases Atmospheric Stability</p> Signup and view all the answers

    If the Lifted Index results in a negative number, what does that indicate about the atmosphere?

    <p>That the Atmosphere is Absolutely Unstable</p> Signup and view all the answers

    Why do descending columns of air become more unstable?

    <p>Because the top compresses and warms more than the bottom</p> Signup and view all the answers

    What is the impact of nighttime cooling of the Earth's surface on atmospheric stability?

    <p>Decreases Atmospheric Stability</p> Signup and view all the answers

    Why is it important for pilots to learn about different cloud types?

    <p>To avoid adverse weather conditions</p> Signup and view all the answers

    How does flight within an ACSL cloud compare to flight beneath the lowest ASCL cloud?

    <p>Relatively smooth within, and rough below.</p> Signup and view all the answers

    Why is a 'Bora' wind also called a 'Fall' wind?

    <p>Because the cold air descends the leeward slope quickly and 'falls' off the mountains due to its relatively high density.</p> Signup and view all the answers

    Why do Dust Devils form?

    <p>Convective activity causes a rotating downdraft.</p> Signup and view all the answers

    What do KH Wave clouds indicate concerning the atmosphere above and below the base of the clouds?

    <p>High winds aloft, with relatively calm winds below.</p> Signup and view all the answers

    How does Dewpoint relate to Air Temperature in the formation of Upslope Fog?

    <p>Dewpoint is lower than Air Temperature</p> Signup and view all the answers

    Why is warm, moist air moving over colder land mentioned as a factor in dewpoint-related fog formation?

    <p>Moist air over water carries more water vapor than over land</p> Signup and view all the answers

    What distinguishes Volcanic Ash from other obstructions in its danger to Aircraft Operations?

    <p>Volcanic Ash can melt inside aircraft engines</p> Signup and view all the answers

    How does Volcanic Ash affect visibility for aircraft compared to other weather phenomena?

    <p>Reduces visibility to near zero</p> Signup and view all the answers

    What differentiates Precipitation from other atmospheric events that fall to the ground?

    <p>Involves any form of water particle reaching the ground</p> Signup and view all the answers

    What role does Adiabatic Cooling play in the formation of Upslope Fog?

    <p>Lowers the air temperature as it moves uphill</p> Signup and view all the answers

    How does warm, moist air moving over colder land influence the formation of fog?

    <p>Leads to a drop in air temperature towards the dewpoint</p> Signup and view all the answers

    'Volcanic Ash' poses a unique danger to aircraft due to:

    <p>'Volcanic Ash' being extremely abrasive</p> Signup and view all the answers

    What causes Squall Line Thunderstorms to form?

    <p>Lifting Action is produced by a Front that can run for hundreds of miles.</p> Signup and view all the answers

    How does a Supercell thunderstorm differ from a Single Cell Thunderstorm?

    <p>The Supercell has a tilted vertical structure that separates the updrafts from the downdrafts.</p> Signup and view all the answers

    What are the necessary ingredients to form a Thunderstorm?

    <p>Lifting Action, Moisture, and an Unstable Lapse Rate</p> Signup and view all the answers

    How quickly can a thunderstorm complete all 3 life cycles?

    <p>In as little as 30 minutes</p> Signup and view all the answers

    What advantage does airborne radar have over ground-based Weather Radar in terms of power and wavelength?

    <p>Higher beam width, and ability to see more of the storm per sweep</p> Signup and view all the answers

    Why are Drizzle and Snow Grains unique in their formation compared to Rain and Snow?

    <p>Drizzle and Snow Grains form from low-lying clouds with very little vertical development</p> Signup and view all the answers

    What makes ground weather radar products more reliable in painting a picture of precipitation compared to airborne radar?

    <p>Ground weather radar products are less prone to attenuation, and is stitched together from multiple radar sites</p> Signup and view all the answers

    What types of precipitation are most reflective to Weather Radar?

    <p>Liquid, Numerous, and Large</p> Signup and view all the answers

    Which characteristic is NOT true about Drizzle and Snow Grains in their formation?

    <p>Form from air masses with very low moisture content</p> Signup and view all the answers

    In what way does ground-based Weather Radar have an edge over airborne radar?

    <p>Less prone to attenuation and can see further into the storm</p> Signup and view all the answers

    What type of vertical atmospheric temperature structure does Ice Pellets (Sleet) require for formation?

    <p>Above freezing at formation in the cloud, with a colder Below freezing layer beneath the cloud, and finally another Below freezing layer just above the Earth's surface</p> Signup and view all the answers

    How does the vertical atmospheric temperature structure differ for the formation of freezing rain compared to Ice Pellets (Sleet) at the surface?

    <p>Freezing Rain requires a deeper/thicker above-freezing layer prior to reaching the Earth's surface</p> Signup and view all the answers

    Which type of vertical atmospheric temperature structure is not suitable for Ice Pellets (Sleet) formation?

    <p>Above freezing at formation in the cloud, with a warmer Above freezing layer beneath the cloud, and finally another Above freezing layer just prior to the Earth's surface</p> Signup and view all the answers

    What is one key feature that distinguishes Ice Pellets (Sleet) formation from Freezing Rain formation?

    <p>Ice Pellets (Sleet) require a thinner above-freezing layer close to the Earth's surface</p> Signup and view all the answers

    In terms of atmospheric temperature, what is a critical difference between Ice Pellets (Sleet) and Freezing Rain?

    <p>Ice Pellets (Sleet) require a deeper/thicker above-freezing layer prior to reaching the Earth's surface</p> Signup and view all the answers

    What type of temperature profile is unsuitable for Ice Pellets (Sleet) formation?

    <p>Above freezing at formation in the cloud, with a warmer Above freezing layer beneath the cloud, and finally another Above freezing layer just prior to the Earth's surface</p> Signup and view all the answers

    What is a key requirement for a vertical atmospheric temperature structure conducive to Freezing Rain?

    <p>A thicker below-freezing layer right before reaching the Earth's surface</p> Signup and view all the answers

    How does Ice Pellets (Sleet) differ from Freezing Rain regarding their atmospheric temperature requirements?

    <p>'Ice Pellets (Sleet)' are formed under constant below-freezing temperatures throughout their vertical structure.</p> Signup and view all the answers

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