1 Conceptual Model (CM): Comma (different types) How to use MSG satellite images similarities to and improvements over MTP Contact person: Veronika Zwatz-Meise Version 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)

3 Large Comma with thick cloud

4 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: Ch09 Sharper contours through improved space resolution Co

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

7 MTP: vis Co

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

9 MSG: Ch02 Compared to Ch01: no strong differences in the cloud features; but: much better land recognition Co

10 MTP:VIS(2x)+IR Co

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

12 Small Comma in high cloud

13 MTP: ir Co

14 MSG: Ch09 Sharper contours through improved 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

17 Looks relatively similar; but: somewhat coarser space resolution MSG: Ch01 Grey cloud represent transparent cloud Co

18 MSG: Ch02 Compared to Ch01: no strong differences in the cloud features over the ocean; but: much better land recognition transparent cloud less good visible than in Ch01 Co

19 MTP:VIS(2x)+IR Blue: high cloud is very dominant Co

20 MSG:129 Sharper contours and more detailed grey-shades through improved space resolution in IR and additional information from 2 different VIS channels Dark blue: High cloud light blue: thick cells yellow: less thick cloud cells Co

21 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

23 Comma within huge upper level trough H500

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

25 H500 Comma within huge upper level trough

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

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

28 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 structure recognisable

31 MSG:129 Co Co: blue: mainly cold cloud tops

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

33 Co MSG: Ch03 dark grey: mainly cold cloud tops some white spots represent cells with water clouds (tops not yet ice)

34 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

35 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

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

37 Co MSG: Ch04 Co: cold cloud tops; grey spots represent warmer cells

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

39 MSG:139 Co Co: blue: mainly cold cloud tops some magenta spots visible

40 MSG:134 Co Co: brown: mainly cold cloud tops some yellow spots visible