ATSC 113 SNOW EXAM QUESTIONS WITH ALL CORRECT ANSWERS
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ATSC 113 SNOW
Institution
ATSC 113 SNOW
ATSC 113 SNOW EXAM QUESTIONS WITH ALL CORRECT ANSWERS
Why is the orientation of the main shaft of a wind barb important? - Answer- It indicates the direction of the wind
If you see four triangles on a wind barb at the elevation you're planning to ride, what does this indicate? Assume that th...
ATSC 113 SNOW EXAM QUESTIONS
WITH ALL CORRECT ANSWERS
Why is the orientation of the main shaft of a wind barb important? - Answer- It indicates
the direction of the wind
If you see four triangles on a wind barb at the elevation you're planning to ride, what
does this indicate? Assume that the units as are they were presented in the snow
learning goals. - Answer- A good day to stay inside and avoid skiing
How might a weak pressure gradient be represented on a pressure map? - Answer- The
isobars are far apart
What does a temperature contour on a pressure-level map indicate? - Answer- Points
that have the same temperature
What information is necessary in order to interpolate from temperature on a pressure-
level map to a free-air temperature at a different altitude? Select the best answer. -
Answer- ALL OF THE BELOW
The forecasted temperature
Dry or wet adiabatic lapse rate
The forecasted relative humidity
You plan to go skiing with friends at Whistler (elevation ~2000 m), and you have access
to an 85.0-kPa (~1500 m) pressure-level map. The forecasted temperature at Whistler
at 85.0 kPa is -2˚C, and the relative humidity is 60%. How should you interpolate the
temperature up to 2000 m? - Answer- Subtract 5˚C from -2˚C
Your friend calls and tells you that he has made plans to go to Grouse Mountain!
Grouse has an elevation of ~1000 m. Using 85-kPa pressure-level map: the forecasted
temperature is 1˚C and the relative humidity is 95%. What is your estimate of the free-
air temperature? - Answer- 3˚C
What factor(s) do you need to account for when making surface heating or cooling
adjustments to the free-air temperature? Select the best answer. - Answer- Cloud cover,
sun angle, and wind speed
It is a spring afternoon with clear skies and light winds. You have already determined
that the free-air temperature is 4˚C. What is your final temperature forecast after
adjusting for surface heating or cooling? - Answer- 12˚C
, You are forecasting for 8:00 am (just before sunrise) on a winter day with partly cloudy
skies and wind speeds of 50 km/h. The free-air temperature is 0˚C. How should you
adjust your morning temperature forecast for surface heating or cooling? - Answer-
Subtract 2˚C
Snowpack temperature gradient: - Answer- Is the most important factor that influences
the evolution of a snowpack.
Under what conditions are faceted crystals produced? - Answer- Large vertical
temperature gradient and fast-moving water vapour
When a substance undergoes a phase change directly from the gas to the solid phase
without the liquid phase in between, this is known as: - Answer- Deposition
How might surface hoar lead to an avalanche? - Answer- Due to its feathery and
delicate nature creating weak bonds
What is needed for surface hoar to form? - Answer- Clear skies, calm winds under 15
km/h, and strong temperature inversion above the surface
What characteristics are associated with weakly-bonded snow layers? - Answer-
Faceted snow crystals, surface hoar, newly-fallen snow, large vertical snowpack
temperature gradient
It is spring and you observe that it is 7˚C with sunny, clear skies. What conditions might
you need to be aware of? - Answer- Snowmelt, strong insolation, possible wet slab
avalanche
Which ONE of the following characteristics APPLIES to transitional climates? - Answer-
Moderate snowfall
The descriptions below are characteristic of which snow climate?
Smaller snowfall totals per storm
Arctic airmasses often arrive from the north
More clear-sky days
Higher avalanche danger - Answer- Continental
Low pressure systems, also referred to as cyclones, - Answer- are associated with bad
weather - Lows can be identified by isobars of decreasing pressure the inner-most
isobar encircling the low centre.
wind chill - Answer- not the actual temperature, but rather the apparent temperature
A frontal zone - Answer- is defined by a relatively strong horizontal temperature
gradient.
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