conceptual model: rapid cyclogenesis

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Conceptual Model: Rapid Cyclogenesis

How to use MSG satellite images

similarities to and improvements

over MTP

Contact person:Veronika Zwatz-Meisezwatz-meise@zamg.ac.atVersion 1.0. 13 July 2004

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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)

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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

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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

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MSG: CH09/03 UTCSharper contours throughimproved space resolution;consecutive sequence only from MSG

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MSG: CH09/06 UTC

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MSG: CH09/09 UTC

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MSG: CH09/12 UTC

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MSG: CH09/15 UTC

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MSG: CH09/18 UTC

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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

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MTP: WV/03 UTC

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MSG: CH05/03 UTCSharper contours throughimproved space resolution;consecutive sequence only from MSG;In MSG two WV channels:Ch05: WV information from high layers

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MSG: CH05/06 UTC

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MSG: CH05/09 UTC

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MSG: CH05/12 UTC

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MSG: CH05/15 UTC

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MSG: CH05/18 UTC

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MSG: CH06/03 UTCIn MSG two WV channelsCh06: 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

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MSG: CH06/06 UTC

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MSG: CH06/09 UTC

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MSG: CH06/12 UTC

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MSG: CH06/15 UTC

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MSG: CH06/18 UTC

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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)

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Ch09;equ.thicknessTFP

Frontal characteristics inhigh gradient of thickness and TFP;high thickness gradient in cloud head area

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Ch09;TA 700 hpa

Frontal characteristics well seen inTA at 700 hPa:WA shield and CA behind CF

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Ch09;Height contours 1000 hPa

Distinct pressure minimum close to the surface(1000 hPa)

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Ch09;height contours500 hPa

Upper level trough at the rear sideof the cloud head

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Ch09;jet streak300 hPa

Distinct jet streak from N, NW;bending to western orientation;cloud head in exit region

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Ch09;jet streakPVA300 hPa

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

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Ch09;height ofPV = 2 units

Stratospheric air (PV =2) down to 600 hPa behind the cloud head;this corresponds to the dark stripein the WV image

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Ch05;zeroline ofshear vort.300 hPa

CH05: WV in high layersZeroline of shear vorticity issomewhat on the anticyclonic side of the black stripe

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Ch06;zeroline ofshear vort.300 hPa

CH06: WV in lower layers than in Ch05Zeroline of shear vorticity is at the boundary between dry and humid air;WV boundary is inclined upward;dry air tilted with height

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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

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139:The IR ch09 is inverted

Frontal cloudband:violet: multilayeredCloud head:yellow: lowviolet: beginning convection andspiral structure

The two black stripes fromWV channel 05 are an indication for the double structure in the convective partof the cloud head

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MSG:139:The IR ch09 is not invertedbut used as original radiation

Brown: thin cold ice cloudBrown-red:thick,

multilayered cloudYellow: thick water cloud

The two black stripes fromWV channel 05 are an indication for the double structure in the convective partof the cloud head

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Frontal cloudband:brown:multilayeredCloud head:yellow: lowbrown: beginning convection andspiral structure

The two black stripes fromWV channel 05 are an indication for the double structure in the convective partof the cloud head