1. METEOSAT SECOND GENERATION (MSG)
APPLICATIONS OF
METEOSAT SECOND GENERATION (MSG)
DAY-TIME CONVECTION
Author: Jochen Kerkmann (EUMETSAT)
Contributors: D. Rosenfeld (HUJ)

2. Note:
in this Powerpoint presentation (in most cases) the SEVIRI images are not inverted, i.e. displayed as solar channels.
If a channel is inverted, this is denoted by the small letter "i".

3. MSG SEVIRI CHANNELS USEFUL TO MONITOR CONVECTION
PART 1:
MSG SEVIRI CHANNELS USEFUL TO MONITOR CONVECTION
DAY-TIME

4. Recommended Channels
HRVIS fine-scale structures
VIS0.6 optical thickness of clouds
NIR1.6 particle size and phase
IR3.9 particle size and phase
WV6.2 upper-level moisture
WV7.3 mid-level moisture, early convection
IR10.8 top temperature

5. HRVIS Fine Scale Structures Cirrus Outflow MSG-1 23 April 2003
17:00 UTC
Channel 12 (HRVIS)
Overshooting Top
Ghana

6. HRVIS Fine Scale Structures The Channel MSG-1 8 June 2003 13:00 UTC
Channel 12 (HRVIS)
Cloud Streets

7. HRVIS Fine Scale Structures Orographic Convection Spain MSG-1
8 June 2003
15:00 UTC
Channel 12 (HRVIS)
Orographic Convection

8. HRVIS Fine Scale Structures MSG-1 5 August 2003 16:30 UTC
Channel 12 (HRVIS)
Spain
Spanish Plume

9. Mesoscale Convective System
HRVIS
Fine Scale Structures
Single Cb
Shadow
Mesoscale Convective System
MSG-1
7 August 2003
16:30 UTC
Channel 12 (HRVIS)
Lac Leman

10. Mesoscale Convective System
Cloud Streets
HRVIS
Fine Scale Structures
Mesoscale Convective System
MSG-1
13 June 2003
12:00 UTC
Channel 12 (HRVIS)
Coastal Convergence
Thin Cirrus
Po Valley

11. HRVIS Fine Scale Structures Cloud Streets MSG-1 13 June 2003 12:00 UTC
Channel 12 (HRVIS)
Coastal Convergence

12. VIS0.6 Optical Thickness Thick Cb Cloud Thin Cirrus Anvil MSG-1
5 June 2003
14:45 UTC
Channel 01
(VIS0.6)

13. NIR1.6 Particle Size and Phase Large Ice Particles Small Ice Particles
Water Clouds
MSG-1
5 June 2003
14:45 UTC
Channel 03
(NIR1.6)

14. IR3.9 Particle Size and Phase Large Ice Particles Small Ice Particles
Water Clouds
MSG-1
5 June 2003
14:45 UTC
Channel 04
(IR3.9)

15. High Mid-Level Moisture
Dark Stripe
WV7.3
Mid-Level Moisture
High Mid-Level Moisture
MSG-1
5 June 2003
14:45 UTC
Channel 06i
(WV7.3)

16. IR10.8 Top Temperature Cold Clouds Warm Clouds MSG-1 5 June 2003
14:45 UTC
Channel 09
(IR10.8)

17. CHANNEL DIFFERENCES USEFUL TO MONITOR CONVECTION
PART 2:
CHANNEL DIFFERENCES USEFUL TO MONITOR CONVECTION
DAY-TIME

18. Recommended Differences
NIR1.6 - VIS0.6 optical thickness, phase,
particle size
IR3.9 - IR10.8 optical thickness, phase,
particle size, emissivity
IR8.7 - IR10.8 optical thickness
IR IR10.8 optical thickness
WV6.2 - IR10.8 overshooting tops
WV6.2 - WV7.3 overshooting tops

19. MSG-1
5 June 2003
14:45 UTC
Difference Image
NIR1.6 - VIS0.6

20. Note: same as previous image, but black/white inverted (i = inverted)
MSG-1
5 June 2003
14:45 UTC
Difference Image
(NIR1.6 - VIS0.6)i

21. MSG-1
5 June 2003
14:45 UTC
Difference Image
IR3.9 - IR10.8

22. MSG-1
5 June 2003
14:45 UTC
Difference Image
IR8.7 - IR10.8

23. MSG-1
5 June 2003
14:45 UTC
Difference Image
IR IR10.8

24. MSG-1
5 June 2003
14:45 UTC
Difference Image
WV6.2 - IR10.8

25. MSG-1
5 June 2003
14:45 UTC
Difference Image
WV6.2 - WV7.3

26. MSG-1
5 June 2003
14:45 UTC
Difference Image
WV6.2 - IR10.8

27. MSG-1
5 June 2003
14:45 UTC
Difference Image
WV6.2 - WV7.3

28. RED-GREEN-BLUE (RGB) COLOUR COMPOSITES FOR MONITORING CONVECTION
PART 3:
RECOMMENDED
RED-GREEN-BLUE (RGB) COLOUR COMPOSITES FOR MONITORING CONVECTION
DAY-TIME

29. Recommended RGBs Daytime
Red: Cloud depth and amount of cloud water and ice,
provided by the visible reflectance at 0.6 mm.
Green: Cloud particle size and phase, approximated by the
1.6 mm or 3.9 mm solar reflectance component.
Blue: Temperature, provided by the 10.8 mm channel.

30. Recommended RGBs Daytime - HRVIS
Red: Cloud optical depth and detailed cloud top structures,
provided by the HRVIS channel.
Green: Cloud optical depth and detailed cloud top structures,
Blue: Temperature, provided by 10.8 mm, or cloud particle size
and phase, provided by the NIR1.6 or IR3.9 channel.

31. Typical Convective Development - Daytime -
VIS0.6 NIR1.6 IR3.9 IR10.8
I. Very early stage white white white light grey
(low, warm water cloud) opt thick water water warm
II. First convection* white white white dark grey
(first convective towers) opt thick supercooled supercooled cold
water water
III. First icing white light grey grey black
(transformation in Cb) opt thick small ice small ice very cold
IV. Large icing white dark grey black black
(Cb anvils) opt thick large ice large ice very cold
*This phase is more frequent in Africa, i.e. it is more easy to find examples for this phase in tropical convection

32. RGB 01-04-09 Red Green Blue VIS0.6 IR3.9 IR10.8 RGB
I. Very early stage white-light yellow
II. First convection yellow
III. First icing orange
IV. Large icing red

33. RGB
RGB 0.6 / 3.9 / 10.8
I. Very early stage white-light yellow
II. First convection yellow
III. First icing orange
IV. Large icing red II
III I IV

34. RGB 01-03-09 Red Green Blue VIS0.6 NIR1.6 IR10.8 RGB
I. Very early stage white-light yellow
II. First convection yellow
III. First icing orange
IV. Large icing red-orange

35. II. First Convection (Supercooled Clouds)
Supercooled Water Clouds
MSG-1, 5 June 2003, 10:00 UTC, RGB

36. III. First Icing
Cb Icing
MSG-1, 5 June 2003, 10:30 UTC, RGB

37. IV. Large Icing MSG-1, 5 June 2003, 11:30 UTC, RGB 01-03-09 Large Ice
Small Ice
MSG-1, 5 June 2003, 11:30 UTC, RGB

38. V. Very Large Icing MSG-1, 5 June 2003, 13:30 UTC, RGB 01-03-09
Large Ice
MSG-1, 5 June 2003, 13:30 UTC, RGB

40. Low red: Dark and thin clouds

42. Other RGBs: 03-04-09 Red Green Blue NIR1.6 IR3.9 IR10.8 RGB
I. Very early stage white-light yellow
II. First convection yellow
III. First icing brown
IV. Large icing dark brown

43. Other RGBs: 01-03-04 Red Green Blue VIS0.6 NIR1.6 IR3.9 RGB
I. Very early stage white
II. First convection white
III. First icing khaki-brown
IV. Large icing red-orange

44. RGBs with the HRVIS Channel
- RGB HRV - HRV - IR10.8 ( )
- RGB HRV - HRV - IR3.9 ( )
- RGB HRV - HRV - NIR1.6 ( )

45. Channel 12 (HRV) RGB HRV-HRV-IR10.8i
MSG-1, 5 June 2003, 14:45 UTC

46. Channel 12 (HRV) RGB HRV-HRV-IR3.9i
MSG-1, 5 June 2003, 14:45 UTC

47. Channel 12 (HRV) RGB HRV-HRV-NIR1.6
MSG-1, 5 June 2003, 14:45 UTC

48. Channel 12 (HRV) RGB HRV-HRV-IR10.8i
MSG-1, 8 September 2003, 15:00 UTC

49. Channel 12 (HRV) RGB HRV-HRV-IR3.9i
MSG-1, 8 September 2003, 15:00 UTC

50. Channel 12 (HRV) RGB HRV-HRV-NIR1.6
MSG-1, 8 September 2003, 15:00 UTC

51. RGBs with Difference Images

52. MSG-1
5 June 2003
14:45 UTC
RGB Composite
R = VIS0.6 - NIR1.6
G = IR3.9 - IR10.8
B = WV7.3 - WV6.2