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Ahead of WCB within the Warm Sector

Ahead of WCB within the Warm Sector. These conceptual models will be virtually identical to those associated with the three locations north of the warm front with the exceptions that: There will be and cannot be any evidence of the cold conveyor belt

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Ahead of WCB within the Warm Sector

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  1. Ahead of WCB within the Warm Sector These conceptual models will be virtually identical to those associated with the three locations north of the warm front with the exceptions that: • There will be and cannot be any evidence of the cold conveyor belt • The veering and backing with height signatures will be less pronounced • The reduced extent of warm sector precipitation will be an issue • Gulls are found in the warm sector, more so than eagles… Click for the Conceptual Model and Explanation

  2. Cross-section along Central Branch of the Warm Conveyor Belt (WCB) totally within the WCB B A WCB oriented for maximum frontal lift WCB Virga Precipitation Increasing CCB Moistening Lower Hydrometeor Density Mixing Zone Precipitation At Surface Surface Warm Front CCB B A Content under development

  3. C o Right of the WCB in the Warm Sector The Headless Right Wing Stoop CM The headless gull’s right wing is folded in as if it is about to swoop down. The left wing is still fully extended to catch the lift of the WCB. Signature of Ekman Spiral • Within the PBL: • Probable Ekman spiral near surface resulting in slight veering with range Right Wing Left Wing • Within the WCB: • East of radar veering, warm advection • West of radar nil VWS

  4. o Left Wing Right Wing The Headless Right Wing Stoop CM This slide is reserved for an actual radar example.

  5. Under WCB • This is totally within the warm sector • Only the WCB is sensed • Cloud and precipitation streets will be sensed Click for the Conceptual Model and Explanation

  6. Cross-section along Central Branch of the Warm Conveyor Belt (WCB) totally within the WCB B A WCB oriented for maximum frontal lift WCB Virga Precipitation Increasing CCB Moistening Lower Hydrometeor Density Mixing Zone Precipitation At Surface Surface Warm Front CCB B A Content under development

  7. o Under the WCB in the Warm Sector The Headless Gull CM Both wings are fully extended to catch the lift of the WCB. This is a straight line uniform wind field but could be a slightly divergent signature. Note that headless gulls can’t scream… The advections in the warm sector do not warrant this being called an eagle pattern. • Within the PBL: • Probable Ekman spiral near surface resulting in slight veering with range Right Wing Left Wing • Within the WCB: • East of radar veering, weak warm advection – veering winds possible • West of radar backing, cold advection – backing winds possible

  8. o The Headless Gull CM The southwesterly WCB is essentially a straight flow but there are hints of the upper level divergence depicted in the conceptual model. Right Wing Left Wing

  9. F G B D C o A E The Headless Gull CM The southwesterly WCB is essentially a straight flow but there are hints of the upper level divergence depicted in the conceptual model. Right Wing Left Wing • A and B and the black lines joining the inflexion points represent the top of the veering partly due to the Eckman spiral and perhaps some residual warm air advection. Note the A line is “sharper “ looking than B. • C to D represents a low level jet max. • Notice that outward from A and B and the inflexions the lines of constant radial velocity are nearly parallel( except for some slight backing from B to G) to the radials indicating constant wind direction. • We see a higher level jet max from E to F.

  10. Behind WCB in the Warm Sector Click for the Conceptual Model and Explanation

  11. Cross-section along Central Branch of the Warm Conveyor Belt (WCB) totally within the WCB B A WCB Virga Precipitation Increasing CCB Moistening Lower Hydrometeor Density Mixing Zone Precipitation At Surface Surface Warm Front CCB B B A Content under development

  12. C o Left of the WCB in the Warm Sector The Headless Left Wing Stoop CM The headless gull’s left wing is folded in as if it is about to swoop down. The right wing is still fully extended to catch the lift of the WCB. • Within the PBL: • Probable Ekman spiral near surface resulting in slight veering with range Right Wing Left Wing • Within the WCB: • West of radar backing, cold advection • East of radar nil VWS

  13. o Left Wing Right Wing The Headless Left Wing Stoop CM This slide is reserved for an actual radar example.

  14. Behind WCB pre Cold Front

  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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