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Conceptual Model: Rapid Cyclogenesis

Conceptual Model: Rapid Cyclogenesis. How to use MSG satellite images similarities to and improvements over MTP. Contact person: Veronika Zwatz-Meise zwatz-meise@zamg.ac.at Version 1.0. 13 July 2004. CM: Rapid cyclogenesis. MTP channels in comparison with the corresponding MSG channels

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Conceptual Model: Rapid Cyclogenesis

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  1. Conceptual Model: Rapid Cyclogenesis How to use MSG satellite images similarities to and improvements over MTP Contact person: Veronika Zwatz-Meise zwatz-meise@zamg.ac.at Version 1.0. 13 July 2004

  2. CM:Rapid cyclogenesis • MTP channels in comparison with the corresponding MSG channels • CM Rapid cyclogenesis: IR image + relevant NWP parameters • MSG additional channels + Channel combinations • (WV and WV difference images)

  3. IR sequence • Multilevel frontal cloud band • Low cloud head at rear side of frontal cloud band • Rapid dissolution of cloud at the rear side of the low cloud head • Rapid development of spiral structure • Development of Cbs at developed cloud spiral

  4. MTP: IR/03 UTC As the image time between MTP and MSG differs, a shift between the cloud systems can be noticed in the two images

  5. Sharper contours through improved space resolution; consecutive sequence only from MSG MSG: CH09/03 UTC

  6. MSG: CH09/06 UTC

  7. MSG: CH09/09 UTC

  8. MSG: CH09/12 UTC

  9. MSG: CH09/15 UTC

  10. MSG: CH09/18 UTC

  11. WV sequence • Dark stripe in WV approaches the cloud head area • Dark stripe becomes darker and begins to dissolve cloud at the rear edge of the cloud head area • In Ch05 double structure of the dark stripe with different developments visible • Refinement of CM possible ?! • Development of a dark area in the spiral center

  12. MTP: WV/03 UTC

  13. Sharper contours through improved space resolution; consecutive sequence only from MSG; In MSG two WV channels: Ch05: WV information from high layers MSG: CH05/03 UTC

  14. MSG: CH05/06 UTC

  15. MSG: CH05/09 UTC

  16. MSG: CH05/12 UTC

  17. MSG: CH05/15 UTC

  18. MSG: CH05/18 UTC

  19. In MSG two WV channels Ch06: gives more information from lower layers when comapres Ch05; double structure of black stripes only in last time period resognisable - downward protrusion of dry air MSG: CH06/03 UTC

  20. MSG: CH06/06 UTC

  21. MSG: CH06/09 UTC

  22. MSG: CH06/12 UTC

  23. MSG: CH06/15 UTC

  24. MSG: CH06/18 UTC

  25. CM:Rapid Cyclogenesis • MTP Satellite images • MTP channels in comparison with the corresponding MSG channels • CM Rapid cyclogenesis: IR/WV image + relevant NWP parameters • MSG additional channels + Channel combinations • (WV and WV difference images)

  26. Ch09; equ.thickness TFP Frontal characteristics in high gradient of thickness and TFP; high thickness gradient in cloud head area

  27. Ch09; TA 700 hpa Frontal characteristics well seen in TA at 700 hPa: WA shield and CA behind CF

  28. Ch09; Height contours 1000 hPa Distinct pressure minimum close to the surface (1000 hPa)

  29. Ch09; height contours 500 hPa Upper level trough at the rear side of the cloud head

  30. Ch09; jet streak 300 hPa Distinct jet streak from N, NW; bending to western orientation; cloud head in exit region

  31. Ch09; jet streak PVA 300 hPa Distinct PVA max at 300 hPa in left exit region of the jet streak and in the cloud head area; PVA max close to the jet axis: shear and curvature vorticity

  32. Ch09; height of PV = 2 units Stratospheric air (PV =2) down to 600 hPa behind the cloud head; this corresponds to the dark stripe in the WV image

  33. Ch05; zeroline of shear vort. 300 hPa CH05: WV in high layers Zeroline of shear vorticity is somewhat on the anticyclonic side of the black stripe

  34. Ch06; zeroline of shear vort. 300 hPa CH06: WV in lower layers than in Ch05 Zeroline of shear vorticity is at the boundary between dry and humid air; WV boundary is inclined upward; dry air tilted with height

  35. CM:Rapid Cyclogenesis • MTP Satellite images • MTP channels in comparison with the corresponding MSG channels • CM Rapid cyclogenesis: IR image + relevant NWP parameters • MSG additional channels + Channel combinations • WV and WV difference images

  36. 139: The IR ch09 is inverted Frontal cloudband: violet: multilayered Cloud head: yellow: low violet: beginning convection and spiral structure The two black stripes from WV channel 05 are an indication for the double structure in the convective part of the cloud head

  37. MSG:139: The IR ch09 is not inverted but used as original radiation Brown: thin cold ice cloud Brown-red:thick, multilayered cloud Yellow: thick water cloud The two black stripes from WV channel 05 are an indication for the double structure in the convective part of the cloud head

  38. 134 Frontal cloudband: brown:multilayered Cloud head: yellow: low brown: beginning convection and spiral structure The two black stripes from WV channel 05 are an indication for the double structure in the convective part of the cloud head

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