UBC  ATSC 201 - Meteorology of Storms

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Week 12 21 - 27 Nov 2022
Monday (D1)Finish Homework from previous week.
Be sure your name, student number, and HW# are at top of every page.
Deadline:  Electronically submit your HW by the start of class, 2 pm Monday.
Morning
Midday
2 PMClass:
  1. Turn in HW.
  2. Discussion & interaction on topics from last week (bring your clicker).
  3. Tutorial on decoding a station plot model, including live web maps.
  4. Tutorial on analyzing a weather map.
Readings from last week that were in preparation for today's lect:
S.Ch9. p267-268, 274-276, 279-281.

 
Topic: Synoptic Weather Maps,  Isoplething
.

New Learning Goals:

At the end of this section, you should be able to:

  1. Decode a station plot model
  2. Analyze isobars and isotherms on a weather map, and identify frontal zones and airmasses.



EveningReadings
  • S.Ch12. p403-407, 413-418.
  • S.Ch13. p425 - 433 (top half)
    Warm-up Questions:
    Do quiz W12 D2 online on Canvas.
    Topic: Fronts - part 2 , and
    Extratropical Cyclones - Part 1 - Characteristics & Evolution
    .
    Learning Goals
    At the end of this section, you should be able to:

    1. Using vertical cross sections, contrast warm and cold fronts and  occlusions.
    2. Explain how geostrophic adjustment affects fronts.
    3. Describe the characteristics of upper-tropospheric fronts
    4. Compare and contrast dry lines with fronts.
    5. Synthesize your knowledge of fronts (including dry lines and gust fronts) with your knowledge of thunderstorm triggering to explain why some fronts are favored locations for thunderstorms.
    6. Draw diagrams showing how fronts change around an evolving cyclone.

    7. Catalog favored cyclogenesis regions, and explain why they are favored.
    8. Explain why cyclones can intensify in spite counteracting effect of  boundary-layer winds.
    9. Diagnose cyclone location, movement, and evolutionary stage from satellite imagery. 
    10. Recognize cyclones in upper-level isobaric charts as well as surface charts. 
    11. Form a picture in your mind of the 3-D structure of extratropical cyclones, especially of the tilting of the low center with height. 
    Tuesday (D2)
    Morning
    Midday
    Evening
    10 PMDeadline to finish warm-up Qs.
    Wed (D3).
    Morning
    Midday
    2 PMClass:
    1. Discussion & interaction on topics from readings (bring your clicker).
    2. Discussion of potential vorticity conservation.
    3. Discussion of advection solenoids.
    4. Case-studies from textbook (Apr 2014), and from the Perfect Storm.
    5. Videos:
      •  "Perfect Storm" segments
      •  TLC "Storm of the Century" 11:15-20:00.
    6. Demonstrate the UBC NWP forecast web page.
    7. Show examples of local weather in W. Canada.

    EveningReadings:
    • S.Ch13.p443 (bottom third) -453 (top third),
      p454 - 456 (top 2/3),  p463-467,  
    Warm-up Questions:
    Do quiz W12 D4 online on Canvas.
    Topic: Extratropical Cyclones-  Part 2 -  Cyclogenesis
    .
    Learning Goals
    At the end of this section, you should be able to:


    1. Describe how lee cyclogenesis works, and explain why it is so important to weather in N. America.
    2. Explain the processes that can increase the vorticity  of a midlatitude cyclone.(i.e., spin up)
    3. Justify why divergence aloft is necessary for cyclogenesis.
    4. Demonstrate how jet-stream curvature and jet-streak characteristics can create the needed divergence aloft.
    5. Qualitatively interpret the terms in the net pressure tendency equation.
    Thurs (D4)
    Morning
    Midday
    Evening
    10 PMDeadline to finish warm-up Qs.
    Friday (D5).
    Morning
    Midday
    2 PMClass:
    1. Discussion & interaction on topics from readings (bring your clicker).

    Evening
    End-of-Week Numerical Homework Exercises.  
    (Due at start of Monday's class.)
    Homework 12:
    S.Ch9 (use spreadsheet for all, except use printed (or use pdf if COVID) copy of Figs. 9.19 & 9.21 for appropriate exercises assigned in Ch9): A1d, A7a, A8d, A10all.

     S.Ch13 (use spreadsheet for all):
     A3d, A7d, A14d, A16d.


    ...   
    Learning Goals
    At the end of this section, you should be able to:
    1. Apply topics covered earlier this week to compute number answers & infer their significance. 

    Saturday(D6)
    .
    Sunday (D7)
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