Conceptual Model (CM): Comma

(different types) How to use MSG satellite images similarities to and improvements over MTP Contact person: Veronika Zwatz-Meise [email protected]

Version 1.0. 13 July 2004 1

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) 2

Large Comma with thick cloud

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MTP: ir

Co

MSG: Ch09

Co

Sharper contours through improved space resolution 5

MSG: Ch10

Co

Visual inspection shows only very slight changes between Ch09 and Ch10; quantitative evaluation necessary 6

MTP: vis

Co

7

MSG: Ch01

Co

Looks relatively similar; but: somewhat coarser space resolution 8

MSG: Ch02

Co

Compared to Ch01: no strong differences in the cloud features; but: much better land recognition 9

MTP:VIS(2x)+IR

Co

10

MSG: 129 Sharper contours and more detailed colour combinations through improved space resolution in IR and additional information from 2 different VIS channels

Co

11

Small Comma in high cloud

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MTP: ir

Co

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MSG: Ch09

Co

Sharper contours through improved space resolution 14

MSG: Ch10

Co

Visual inspection shows only very slight changes between Ch09 and Ch10; quantitative evaluation necessary 15

MTP: vis

Co

16

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

Co

Grey cloud represent transparent cloud 17

MSG: Ch02

Co

transparent cloud less good visible than in Ch01 Compared to Ch01: no strong differences in the cloud features over the ocean; but: much better land recognition 18

MTP:VIS(2x)+IR

Co

Blue: high cloud is very dominant 19

MSG:129 Sharper contours and more detailed grey-shades through improved space resolution in IR and additional information from 2 different VIS channels

Co

Dark blue: High cloud light blue: thick cells yellow: less thick cloud cells 20

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) 21

Comparison of two comma types

• Large Comma with thick cloud • Small Comma in high cloud 22

H500 Comma within huge upper level trough 23

PVA at 500 hPa Comma: PVA max is dramatically shifted to the S (frontal area) model error ? 24

H500 Comma within huge upper level trough 25

PVA at 500 hPa Comma: accompanied by distinct PVA max 26

Isotachs and PVA 300 Comma: distinct PVA max in left exit region of the jet streak 27

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 28

Comparison of two comma types

• Large Comma with thick cloud • Small Comma in high cloud 29

MSG:129

Co

Co: blue/grey/yellow: multilayered; cellular character in structure recognisable 30

MSG:129

Co

Co: blue: mainly cold cloud tops 31

Co

dark grey: mainly cold cloud tops very few white spots represent cells with water clouds (tops not yet ice) 32

MSG: Ch03

Co

dark grey: mainly cold cloud tops some white spots represent cells with water clouds (tops not yet ice) 33

Co

Grey shades: from Vis channels Cyan: represents the ice clouds from Ch03; cyan dominates the Co area; different shades within cyan show different vertical structure of cells 34

MSG:321

Co

Grey shades: from Vis channels Cyan: 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 35

Co

Co: cold cloud tops; only very few grey spots (represent warmer cells) 36

MSG: Ch04

Co

Co: cold cloud tops; grey spots represent warmer cells 37

Co

Co: red: low cell tops; water clouds magenta: thick cells with ice cloud blue: cold/ high cloud tops ; ice cloud 38

MSG:139

Co

Co: blue: mainly cold cloud tops some magenta spots visible 39

MSG:134

Co

Co: brown: mainly cold cloud tops some yellow spots visible 40