1

Conceptual Model (CM):Comma

(different types)

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

2

Conceptual Model (CM):Comma

(different types)

• MTP channels in comparison with the corresponding MSG channels

• CM: commas: IR image + relevant NWP parameters

• MSG additional channels + Channel combinations

• (WV and WV difference images)

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Large Comma with thick cloud

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MTP: ir

Co

As the image time between MTP and MSG differs, a shift between the cloud systems can be noticed in the two images

5

MSG: Ch09Sharper contours throughimproved space resolution

Co

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MSG: Ch10Visual inspection shows only very slight changes between Ch09 and Ch10;quantitative evaluation necessary

Co

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MTP: vis

Co

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MSG: Ch01Looks relatively similar;but: somewhat coarser space resolution

Co

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MSG: Ch02

Compared to Ch01:no strong differences in the cloudfeatures;but: much better land recognition

Co

10

MTP:VIS(2x)+IR

Co

11

MSG: 129

Sharper contours and more detailed colour combinationsthrough improved space resolution in IR and additional information from 2 different VIS channels

Co

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Small Comma in high cloud

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MTP: ir

Co

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MSG: Ch09

Sharper contours throughimproved space resolution

Co

15

MSG: Ch10

Visual inspection shows only very slight changes between Ch09 and Ch10;quantitative evaluation necessary

Co

16

MTP: vis

Co

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Looks relatively similar;but: somewhat coarser space resolution MSG: Ch01

Grey cloud representtransparent cloud

Co

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MSG: Ch02

Compared to Ch01:no strong differences in the cloudfeatures over the ocean;but: much better land recognition

transparent cloudless good visible thanin Ch01

Co

19

MTP:VIS(2x)+IR

Blue: high cloudis very dominant

Co

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MSG:129

Sharper contours and more detailed grey-shadesthrough improved space resolution in IR and additional information from 2 different VIS channels

Dark blue: High cloudlight blue: thick cellsyellow: less thick cloud cells

Co

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• MTP channels in comparison with the corresponding MSG channels

• CM: commas: IR image + relevant NWP parameters

• MSG additional channels + Channel combinations

• (WV and WV difference images)

Conceptual Model (CM):Comma

(different types)

22

Comparison of two comma types

• Large Comma with thick cloud

• Small Comma in high cloud

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Commawithin huge upper level trough

H500

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PVA at 500 hPa Comma:PVA max is dramaticallyshifted to the S (frontal area)model error ?

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H500

Commawithin huge upper level trough

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PVA at 500 hPa

Comma:accompanied by distinct PVA max

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Isotachs and PVA 300

Comma: distinct PVA max inleft exit region of the jet streak

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Conceptual Model (CM):Comma

(different types)

• MTP channels in comparison with the corresponding MSG channels

• CM: commas: IR image + relevant NWP parameters

• MSG additional channels + Channel combinations

• WV and WV difference images

29

Comparison of two comma types

• Large Comma with thick cloud

• Small Comma in high cloud

30

Co

MSG:129

Co:blue/grey/yellow:multilayered;cellular character in structurerecognisable

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MSG:129

Co Co:blue: mainly cold cloud tops

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Co

dark grey: mainly cold cloud topsvery few white spots representcells with water clouds (tops not yet ice)

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Co

MSG: Ch03

dark grey: mainly cold cloud topssome white spots representcells with water clouds (tops not yet ice)

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Co

Grey shades: from Vis channelsCyan: represents the ice clouds from Ch03;cyan dominates the Co area;different shades within cyan showdifferent vertical structure of cells

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MSG:321

CoGrey shades: from Vis channelsCyan: represents the ice clouds from Ch03;lots of grey cells visible through the dark cyan of the Co;cells and ice clouds are somewhat decoupled

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Co

Co:cold cloud tops;only very few grey spots (represent warmer cells)

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Co

MSG: Ch04

Co:cold cloud tops;grey spots representwarmer cells

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Co

Co:red: low cell tops; water cloudsmagenta: thick cells with ice cloudblue: cold/ high cloud tops ; ice cloud

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MSG:139

Co

Co:blue: mainly cold cloud topssome magenta spots visible

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MSG:134

Co

Co:brown: mainly cold cloud topssome yellow spots visible