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Conceptual Model of Cloud Bulge and Spiral Development in Satellite Imagery

This comprehensive overview explores the phenomena of cloud bulges and spirals as observed in satellite imagery. Highlighting typical cloud configurations, the analysis includes the dynamics of the rearward edge of frontal cloud bands and their bright appearance in various spectral channels. We examine key meteorological concepts such as vorticity effects and the Conveyor Belt Theory, detailing lower and upper layer mechanisms that influence cloud formation and dissolution. Key parameters including surface lows and temperature advection are discussed in relation to typical weather events, such as increased precipitation and stormy conditions.

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Conceptual Model of Cloud Bulge and Spiral Development in Satellite Imagery

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Presentation Transcript

  1. Conceptual Model of: Wave

  2. Cloud Structure in Satellite Image

  3. Typical cloud configurations • Cloud bulge at rearward edge of frontal cloud band • Bright in all three channels • Sometimes rearward edge of cloud bulge translucent in VIS • Rather smooth texture • Often in WV black stripe indication an eddy wave

  4. Development of cloud bulge to cloud spiral and further to occlusion spiral initial occl. stage wave stage

  5. Meteorological Physical Background

  6. Basic ideas:Development of cloud bulge and spiral through effect of vorticity

  7. Conveyor Belt Theory:Lower layers • Warm conveyor belt • rising in area of wave • Upper relative stream • at the rear of the cloud band and wave bulge • Saddle point in upper relative stream • immediately south, southweast of wave bulge • rising to the N, • sinking to the S u.r.s w.c.b

  8. Conveyor Belt Theory:Upper layers • Warm conveyor belt • rising • more to the leading edge of the cloud band • Upper relative stream • partly superimposed on wave bulge • responsible for cloud dissolution • distinct feature in WV: black stripe overrunning frontal cloud u.r.s w.c.b

  9. frontal cloud wave cloud Selection of relevant isentropic surface:

  10. u.r.s w.c.b saddle point

  11. Key Parameters:Relevant numerical parameters and their typical distribution

  12. Surface low and temperature advection Surface minimum: • Surface minimum low: • in the area of the cloud bulge • Zeroline of TA • crosses cloud bulge: • Juxtaposition of WA - CA maxima • WA maximum within cloud bulge • CA maximum immediately behind in cold air WA L CA

  13. L WA CA

  14. Upper level height and vorticity advection • Upper level trough • behind cloud feature • PVA maximum • partly superimposed on cloud bulge • partly behind PVA max

  15. L PVA

  16. Important features: • WA maximum: • within cloud bulge of wave • PVA maximum • superimposed on cloud bulge • partly behind, in CA

  17. WA maximum: W PVA maximum: P W P

  18. Typical weather events • Increasing widespread precipitation • Possibly thunderstorms in the area of the PVA • Most intensive precipitation to be found in the area of the emerging low cloud • Increasing surface winds; ev. Stormy winds

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