UBC  ATSC 201 - Meteorology of Storms

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Week 9 31 Oct  - 6 Nov 2022
Monday (D1)Finish Homework from previous week.
Be sure your name, student number, and HW# are at top of every page.
Deadline:  Turn in your HW by the start of class, 2 pm Monday.
2 PMClass:
  1. Turn in HW.
  2. Discuss the upcoming midterm exam, and reminder that all the previous Learning Goals are an excellent a study guide.
  3. Qualitative discussion downbursts & gustfronts, based on pre-readings from Stull section 15.2.
  4. Keynote slides of downbursts, arc clouds & haboobs.
  5. YouTube videos Day2-50 thru Day 2-75.
  6. Video on Finding the Storm, from DVD "Art of Storm Chasing".  Disk 1, Title 2, Ch 4.
Topic: Downbursts & Gust Fronts
Learning Goals
At the end of this section, you should be able to:

  1. Describe the conditions needed for downbursts to form.
  2. Anticipate the behavior of downbursts and gust fronts.
  3. Explain the hazard of downbursts and gust fronts to aircraft & structures.
  4. Look at arc clouds, haboobs and Doppler radar to recognize the downburst/gust-front hazard, and take appropriate action to be safe.
  5. Relate the fundamentals that you learned earlier in this course to the favorable conditions needed for thunderstorm formation.
  6. Normand's Rule, for estimating wet bulb temperature Tw.
  7. The utility of CAPE for predicting Storm hazards.

  • Review all previous readings.
Optional Review Session:
Tuesday afternoon or evening.  (See details either mentioned in class, or as an Announcement in Canvas)
Topic: Study for the open-book Midterm Exam
Learning Goals
At the end of this section, you should be able to:

  1. Demonstrate on the exam that you have synthesized all the material covered into a coherent understanding of:
       a) thunderstorms,
       b) atmospheric thermodynamics,
       c) atmospheric dynamics.
  2. Be proficient at using the following tools:
       a) hodographs,
       b) thermo diagrams,
       c) weather radar images.
  3. Use equations to calculate and interpret quantitative results.
Tuesday (D2)
10 PM(No warm-up questions today.)
Wed (D3).
2 PMClass:
  1. Midterm Exam - Individual. 
  2. Open books, open notes, open calculator.
  3. Covers all Learning Goals up through today.
  4. Covers Chapters
    (all except 3.7 & 3.8),
    (all except 4.6),
    (radar portions, see footnote*),
    (all, except the portion of section 10.8.3 after the first 4 paragraphs)
    (sections 11.9.1 - 11.9.3),
    (all except
    - 15.1 Rain & Hail (all),
    - 15.2 Downbursts (only qualitative),
    - 15.3 Thunder (all except 15.3.4 &,
    - 15.4 Tornado (all except p590-592 top half),
    Appendix A (& skim Appendix B).
    - Read the Remote Sensing intro on p219, and
    - the weather radar Fundamentals section 8.3.1. 
    - On p246 read the one dBZ paragraph containing eq. (8.27)
    - Next read the sections - . 
    -Finally read the Identification of Storm Characteristics subsection


  • S.Ch11.  p329-334, and Figs. 11.11, 11.12, & 11.14 on global heat transport, and p341 - 349. (on p341, start with the bottom 1/3 on hydrostatic thermal circulations).
Warm-up Questions:
Do quiz W09 D4 online on Canvas.
Topic:  Global Circulation - Part 1:  
Description, Diff. Heating,  Thermal Circulations,
Geostrophic Adjustment, Thermal Wind
Learning Goals - Global Circulation
At the end of this section, you should be able to:
  1. Use the global-circulation nomenclature and jargon (e.g., zonal, mereridional, extratropical, etc.)
  2. Describe and name the dominant horizontal general-circulation flow patterns at the surface, including monsoonal flows.
  3. Explain the Hadley cell: where it is, what it does to the atmosphere, and how it is connected to the surface flow patterns.
  4. Use LeChatelier's Principle to explain how differential heating drives the global circulation.
  5. Explain how each of the following dynamical processes works:
      a) hydrostatic thermal circulations
      b) geostrophic adjustment
      c) the thermal wind relationship.

Thurs (D4)
10 PMDeadline to finish warm-up Qs.
Friday (D5).
2 PMClass:
  1.  intro to the global circulation

End-of-Week Numerical Homework Exercises.  
(Finish readings before start of Monday's class.)
Homework 9:

Read p159-168 (first column), 170 (top half), and 171 (INFO box at bottom).

: (for the drawings, use a pencil to draw by hand in a space on your spreadsheet printout, or use an electronic pad to edit a pdf file in your note-taking app) A4d, A12d.

S.Ch11: E1, E2   (E exercises, NOT A )


Learning Goals
At the end of this section, you should be able to:
  1. Confidently participate in Monday's tutorial on cloud identification.
  2. Think about general circulation issues.

Sunday (D7)

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Notes: The textbook for this course is Stull, 2017: "Practical Meteorology: An Algebra-based Survey of Atmospheric Science", available for free online, at  https://www.eoas.ubc.ca/books/Practical_Meteorology/ .

The reading and homework assignments use the following abbreviations to indicates various parts of this textbook:

Ch = chapter.
A = "Apply" exercises.
p = page number.
S = Stull, 2018:  "Practical Meteorology" book (online).
s = "Synthesize" exercises.
E = "Evaluate & Analyze" exercises.