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Lab 10

Lab 10. November 20 th , 2013. Snowy Side of Things. Snowfall normally occurs on the NW side of Low Pressure Systems Why? While moisture is fed into the storm, counterclockwise winds usher in cold air in this region, supporting snowfall! Idealized winter storm:. The Aftermath.

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Lab 10

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  1. Lab 10 November 20th, 2013

  2. Snowy Side of Things • Snowfall normally occurs on the NW side of Low Pressure Systems • Why? While moisture is fed into the storm, counterclockwise winds usher in cold air in this region, supporting snowfall! • Idealized winter storm:

  3. The Aftermath • Often we can see the remnants of a significant winter storm (images taken from NOAA/ERH) • Surface temperature of regions with snow compared to surrounding areas? (Hint: Think albedo)

  4. Winter Precip Type

  5. What Kind Of Precipitation?????? SNOW!!!!!

  6. What Kind Of Precipitation?????? SLEET!!!!!!!!!

  7. What Kind Of Precipitation?????? Freezing RAIN!!

  8. What Kind Of Precipitation?????? RAIN!!!!!!!!

  9. Lake Effect - Revisited • Remember, lake effect occurs when cold air moves relatively warm lake waters. • Great lakes tend to freeze as the winter progresses. • The deeper the water, the longer it takes to freeze…why? • Based on annual average snowfall and the ideas above, which great lake is likely the deepest?

  10. 16.6 a. No need for calculation, just explain your answer

  11. Lake Effect:Unstable Lower Troposphere • Assume water surface temperature is 5 deg. C • What do you assume the air temperature is just above the water’s surface? • 5 deg C (although it may be just a little colder) • If the temperature at 1600 m is -15 deg. C, what is the stability of the lower troposphere? • 5 - (-15) = 20 deg. C per 1.6 km • 20 deg. C / 1.6 km = 12.5 deg. C / km • Unstable!

  12. Wind - Chill • The temperature it “feels-like” due to the flow of air on exposed skin.

  13. Lab Assignment • 16.1 (a, b) • 16.3 • 16.6 (a, b, c, d) (no calculation necessary for part a, just very brief explanation) • 16.7 (a, b, c) • 16.9 (a, b) • 16.11 (a) Paul’s office hours  Thursday’s from 6-7 pm in Wx Center. Ask Dillon or Matt if you don’t know theirs!

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