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Ahead of WCB

Ahead of WCB. Classic area for virga Probability of virga increases with strength and dryness of the CCB and the strength and moisture of leading branch of the WCB Katabatic portion of warm front. Click for the Conceptual Model and Explanation. B.

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Ahead of WCB

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  1. Ahead of WCB • Classic area for virga • Probability of virga increases with strength and dryness of the CCB and the strength and moisture of leading branch of the WCB • Katabatic portion of warm front Click for the Conceptual Model and Explanation

  2. B Warm Frontal Cross-section along Leading Branch of the Warm Conveyor Belt (WCB) Common location for virga A WCB WCB oriented for maximum frontal lift Virga Precipitation Increasing CCB Moistening WCB oriented for less frontal lift Lower Hydrometeor Density Mixing Zone Surface Warm Front CCB Link to Classic Example B A Cold air in Cold Conveyor Belt (CCB) deep and dry Moist portion of Warm Conveyor Belt (WCB) is high and veered from frontal perpendicular – katabatic tendency Dry lower levels of WCB originate from ahead of the system and backed from frontal perpendicular WCB typically veers with height (it is after all, a warm front) Frontal slope is more shallow than the typical 1:200 Precipitation extends equidistant into the unmodified CCB Precipitation extends further into the moistened, modified CCB

  3. C C C C C C WCB DCB CCB DCB Vertical Deformation Zone Distribution and the CBMSummary

  4. Inactive or Katabatic Warm Front

  5. Ahead of WCB Ex 3 C

  6. Under WCB • Virga only likely on the leading edge of the WCB • The CCB is becoming increasingly moist • Frontal overrunning and isentropic lift is increasing thus increasing the intensity of the precipitation process. • Warm front becoming more likely Anabatic Click for the Conceptual Model and Explanation

  7. B Warm Frontal Cross-section along Central Branch of the Warm Conveyor Belt (WCB) A Common location for virga WCB WCB oriented for maximum frontal lift Virga Precipitation Increasing CCB Moistening Lower Hydrometeor Density Mixing Zone Precipitation At Surface Surface Warm Front CCB B A Cold air in Cold Conveyor Belt (CCB) more shallow and moist Moist portion of Warm Conveyor Belt (WCB) is thicker, higher and perpendicularto front Lower levels of WCB have the same origin as the upper level of the WCB - frontal perpendicular WCB shows little directional shift with height. A greater WCB depth is frontal perpendicular Frontal slope is near the typical 1:200 Precipitation extends further into the moistened, modified CCB. Horizontal rain area begins to expand as CCB moistens.

  8. C C C C C C WCB DCB CCB DCB Vertical Deformation Zone Distribution and the CBMSummary

  9. Active or Anabatic Warm Front

  10. Behind WCB • Virga much less likely • The CCB has become moist • Frontal overrunning and isentropic lift is maximized thus maximizing the intensity of the precipitation process. • Warm front is likely Anabatic Click for the Conceptual Model and Explanation

  11. B Warm Frontal Cross-section along Trailing Branch of the Warm Conveyor Belt (WCB) A Common location for virga WCB WCB oriented for maximum frontal lift Virga Precipitation Increasing CCB Moistening Lower Hydrometeor Density Mixing Zone Precipitation At Surface Surface Warm Front CCB B A Cold air in Cold Conveyor Belt (CCB) even more shallow and more moist Moist portion of Warm Conveyor Belt (WCB) is thicker, higher and backed from frontal perpendicular – anabatic tendency Lower levels of WCB have the same origin as the upper level of the WCB WCB probably backs slightly with height in spite of the warm air advection. A greater WCB depth is frontal perpendicular Frontal slope likely steeper than the typical 1:200 Precipitation extends further into the moistened, modified CCB. Horizontal rain area expands rapidly as CCB moistened.

  12. C C C C C C WCB DCB CCB DCB Vertical Deformation Zone Distribution and the CBMSummary

  13. Active or Anabatic Warm Front

  14. Behind WCB

  15. Behind WCB

  16. Behind WCB

  17. Behind WCB

  18. Behind WCB

  19. Behind WCB

  20. This must be and remain as Slide 31. • The links to the three sections of the airflows that comprise each of the conveyor belts are located at Slide 1,11 and 21. • Slide 11 is always the central, col limited circulation. • This leaves 10 PowerPoint slides for the development of the training material which should be more than adequate.

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