Central Facility Presentation

1
APPLICATIONS OF METEOSAT SECOND GENERATION (MSG)
NIGHT-TIME CONVECTION Author Jochen Kerkmann
(EUMETSAT) (kerkmann_at_eumetsat.de) Contributo
rs A. Canessa (Meteo AM)
2
PART 1 MSG SEVIRI CHANNELSUSEFUL TOMONITOR
CONVECTION NIGHT-TIME
3
Recommended Channels WV6.2 upper-level
moisture WV7.3 mid-level moisture, early
convection IR10.8 top temperature
4
IR10.8 Top Temperature
Click on the image to seethe animation !
Squall Line over Western Africa causing violent
rainfall and sandstorms MSG-1, 14 July 2003,
0200-0845 UTC, IR10.8
5
PART 2 CHANNEL DIFFERENCESUSEFUL TOMONITOR
CONVECTION NIGHT-TIME
6
Recommended Differences IR3.9 -
IR10.8 particle size, phase IR8.7 -
IR10.8 optical thickness IR12.0 - IR10.8 optical
thickness WV6.2 - IR10.8 overshooting tops WV6.2
- WV7.3 overshooting tops
7
PART 3 RECOMMENDED RED-GREEN-BLUE (RGB) COLOUR
COMPOSITESFOR MONITORING CONVECTION NIGHT-TIME
8
Recommended RGBs Night-time
Red Cloud optical depth, approximated by
the 12.0 - 10.8 mm or 10.8 - 8.7 brightness
temperature. Green Cloud particle size and
phase, approximated by the 10.8 - 3.9 mm
brightness temperature. Blue Temperature,
provided by 10.8 mm brightness temperature.
9
Typical Convective Development- Nighttime -
12.0-10.8 10.8-8.7 10.8-3.9 10.8 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 wa
ter 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 255 255 200 white-light
yellow II. First convection 255 200 100 light
brown III. First icing 255 100/255 0 red-yellow
IV. Large icing 255 100/255 0 red-yellow
11
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
313
3
7
4
MSG-1 11 November 2003 0300 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 1900 UTC RGB Composite R
IR12.0-IR10.8 G IR10.8-IR3.9 B IR10.8
13
MSG-1 8 June 2003 1930 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
1630 UTC
1730 UTC
MSG-1, 28 August 2003, RGB Composite RIR12.0-IR10
.8, GIR10.8-IR3.9, BIR10.8
17
MSG-1 28 August 2003 1730 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 1900 UTC Channel 09
BT (IR10.8)
Severe Convection
BT K
21
Click on the image tosee the animation !
MSG-1 23 April 2003 1900 - 2030 UTC Channel 09
BT (IR10.8)
22
MSG-1 23 April 2003 1900 UTC Difference
Image IR3.9 - IR10.8
23
MSG-1 23 April 2003 1900 UTC Difference
Image IR8.7 - IR10.8
24
MSG-1 23 April 2003 1900 UTC Difference
Image IR12.0 - IR10.8
25
MSG-1 23 April 2003 1900 UTC RGB Composite R
IR12.0-IR10.8 G (IR3.9-IR10.8)i B IR10.8
26
MSG-1 23 April 2003 1900 UTC RGB Composite R
IR10.8-IR8.7 G (IR3.9-IR10.8)i B IR10.8
27
MSG-1 23 April 2003 1900 UTC RGB Composite R
IR3.9-IR10.8 G IR8.7-IR10.8 B IR12.0-IR10.8