1. METEOSAT SECOND GENERATION (MSG) NIGHT-TIME CONVECTION
APPLICATIONS OF
METEOSAT SECOND GENERATION (MSG)
NIGHT-TIME CONVECTION
Author: Jochen Kerkmann (EUMETSAT)
Contributors: A. Canessa (Meteo AM)

2. MSG SEVIRI CHANNELS USEFUL TO MONITOR CONVECTION
PART 1:
MSG SEVIRI CHANNELS USEFUL TO MONITOR CONVECTION
NIGHT-TIME

3. Recommended Channels
WV6.2 upper-level moisture
WV7.3 mid-level moisture, early convection
IR10.8 top temperature

4. Click on the image to see the animation !
IR10.8 Top Temperature
Click on the image to see the animation !
Squall Line over Western Africa causing violent rainfall and sandstorms
MSG-1, 14 July 2003, 02:00-08:45 UTC, IR10.8

5. CHANNEL DIFFERENCES USEFUL TO MONITOR CONVECTION
PART 2:
CHANNEL DIFFERENCES USEFUL TO MONITOR CONVECTION
NIGHT-TIME

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

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

8. Recommended RGBs Night-time
Red: Cloud optical depth, approximated by the
mm or brightness temperature.
Green: Cloud particle size and phase, approximated by the
mm brightness temperature.
Blue: Temperature, provided by 10.8 mm brightness temperature.

9. Typical Convective Development - Nighttime -
I. Very early stage white white white light grey
(low, warm water cloud) opt thick opt thick low water warm
II. First convection* white white light grey dark grey
(first convective towers) opt thick supercooled supercooled cold
water water
III. First icing white grey b/w noise black
(transformation in Cb) opt thick ice cloud very cold very cold
IV. Large icing white grey b/w noise black
(Cb anvils) opt thick ice cloud very cold very cold
*This phase is more frequent in Africa, i.e. it is more easy to find examples for this phase in tropical convection

10. RGB 10-09 / 09-04 / 09 Red Green Blue 12.0-10.8 10.8-3.9 10.8 RGB
I. Very early stage white-light yellow
II. First convection light brown
III. First icing /255 0 red-yellow
IV. Large icing /255 0 red-yellow

11. 5 8 9 3 7 4 MSG-1 11 November 2003 03:00 UTC RGB Composite
1. Desert quartz sands.
2. Desert soil.
3. Sea surface.
4. Sc with small drops.
5. Supercooled water layer clouds, no precip.
6. Lightly precip. cu.
7. Cb with lightning.
8. Deep convection, growing zone.
9. Deep convection, dissipation zone.
10. Thick cirrus.
11. Thin cirrus. 5 8 9
3:13 3 7 4
MSG-1
11 November 2003
03:00 UTC
RGB Composite
R = IR12.0-IR10.8
G = IR10.8-IR3.9
B = IR10.8 6 5 5 11 2 1 2 10 1

12. MSG-1
23 April 2003
19:00 UTC
RGB Composite
R = IR12.0-IR10.8
G = IR10.8-IR3.9
B = IR10.8

13. MSG-1
8 June 2003
19:30 UTC
RGB Composite
R = IR12.0-IR10.8
G = IR10.8-IR3.9
B = IR10.8

14. PART 4:
EUROPEAN EXAMPLES

15. Severe Hailstorm Padova-Treviso (I)
28 August 2003

16. MSG-1, 28 August 2003, RGB Composite
16:30 UTC :30 UTC
MSG-1, 28 August 2003, RGB Composite
R=IR12.0-IR10.8, G=IR10.8-IR3.9, B=IR10.8

17. MSG-1
28 August 2003
17:30 UTC
RGB Composite
R = IR12.0-IR10.8
G = IR10.8-IR3.9
B = IR10.8

18. PART 5:
AFRICAN EXAMPLES

19. Convection Ghana
23 April 2003

20. Thin Cirrus MSG-1 23 April 2003 19:00 UTC Severe Convection
Channel 09 BT
(IR10.8)
Severe Convection
BT [K]

21. Click on the image to see the animation !
MSG-1
23 April 2003
19: :30 UTC
Channel 09 BT
(IR10.8)

22. MSG-1
23 April 2003
19:00 UTC
Difference Image
IR3.9 - IR10.8

23. MSG-1
23 April 2003
19:00 UTC
Difference Image
IR8.7 - IR10.8

24. MSG-1
23 April 2003
19:00 UTC
Difference Image
IR IR10.8

25. MSG-1
23 April 2003
19:00 UTC
RGB Composite
R = IR12.0-IR10.8
G = (IR3.9-IR10.8)i
B = IR10.8

26. MSG-1
23 April 2003
19:00 UTC
RGB Composite
R = IR10.8-IR8.7
G = (IR3.9-IR10.8)i
B = IR10.8

27. MSG-1
23 April 2003
19:00 UTC
RGB Composite
R = IR3.9-IR10.8
G = IR8.7-IR10.8
B = IR12.0-IR10.8