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Paper by Charles A. Doswell III Powerpoint by Christopher J. Stumpf

The Distinction between Large-Scale and Mesoscale Contribution to Severe Convection: A Case Study Example. Paper by Charles A. Doswell III Powerpoint by Christopher J. Stumpf. Differences between Large-Scale and Mesoscale definitions and terms. Large-Scale Processes

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Paper by Charles A. Doswell III Powerpoint by Christopher J. Stumpf

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  1. The Distinction between Large-Scale and Mesoscale Contribution to Severe Convection: A Case Study Example Paper by Charles A. Doswell III Powerpoint by Christopher J. Stumpf

  2. Differences between Large-Scale and Mesoscale definitions and terms • Large-Scale Processes • Synoptic and sub-synoptic processes • Mesoscale Processes • Usually separated on an order of magnitude basis • How do we distinguish between where large scale end and mesoscale begins?

  3. The May 6th 1983 Topeka, KS Tornado

  4. Dynamic and Thermodynamic Factors • A. Large Scale Setting • 850 and 500 mb analysis • Surface low pressure • Topeka, KS Sounding • Limited-Area, Fine-Mesh Model (LFM) analysis • B. Sub-synoptic Features • Thunderstorms near NE and KS border • Dryline in Western KS, OK and TX • Sfc. Pressure Rises

  5. Large Scale Setting850 mb Analysis

  6. Large Scale Setting500 mb Analysis

  7. Surface Analysis at 1200 UTC

  8. 12 and 00 UTC Topeka, KS Soundings

  9. LFM Analysis

  10. Visible Satellite Image 2130 UTC

  11. Vis. Satellite Image at 0000 UTC

  12. Surface Analysis at 2100 UTC

  13. Surface Analysis at 1200 UTC

  14. Defining the Roles of Large-Scale and Mesoscale Processes • Deep Moist Convection can be broken down into three ingredients • Moisture • Conditional Instability • Source of lift • Moisture and Instability can be combined in CAPE. • However, lift needs to be addressed separately

  15. Lift • Rarely is the environment completely unstable

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