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Conceptual Model of: Wave

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Conceptual Model of:. Wave. Cloud Structure in Satellite Image. 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 - PowerPoint PPT Presentation

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Page 1: Conceptual Model of:

Conceptual Model of:

Wave

Page 2: Conceptual Model of:

Cloud Structure in Satellite Image

Page 3: Conceptual Model of:

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

Page 4: Conceptual Model of:

Development of cloud bulge to cloud spiral and further to occlusion spiral

wavestage

initialoccl.stage

Page 5: Conceptual Model of:
Page 6: Conceptual Model of:
Page 7: Conceptual Model of:
Page 8: Conceptual Model of:

Meteorological Physical Background

Page 9: Conceptual Model of:

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

Page 10: Conceptual Model of:

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

w.c.b

u.r.s

Page 11: Conceptual Model of:

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 w.c.b

u.r.s

Page 12: Conceptual Model of:

frontal cloud

wavecloud

Selection of relevantisentropic surface:

Page 13: Conceptual Model of:

w.c.b

u.r.s

saddlepoint

Page 14: Conceptual Model of:

Key Parameters: Relevant numerical parameters and their

typical distribution

Page 15: Conceptual Model of:

Surface low and temperature advection• 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

CA

Surfaceminimum:

L

Page 16: Conceptual Model of:

LWA

CA

Page 17: Conceptual Model of:

Upper level height and vorticity advection

• Upper level trough– behind cloud

feature

• PVA maximum– partly

superimposed on cloud bulge

– partly behind

PVAmax

Page 18: Conceptual Model of:

LPVA

Page 19: Conceptual Model of:

Important features:

• WA maximum:– within cloud bulge of

wave

• PVA maximum– superimposed on cloud

bulge

– partly behind, in CA

Page 20: Conceptual Model of:

WA maximum: W

W

PVA maximum: P

P

Page 21: Conceptual Model of:

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

Page 22: Conceptual Model of: