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Version 0.2, 23 December 2003 Slide: 1
APPLICATIONS OFMETEOSAT SECOND GENERATION (MSG)
NIGHT-TIME CONVECTION
Author:Author: Jochen Kerkmann (EUMETSAT)Jochen Kerkmann (EUMETSAT) ([email protected])([email protected])
Contributors:Contributors: A. Canessa (Meteo AM)A. Canessa (Meteo AM)
Version 0.2, 23 December 2003 Slide: 2
PART 1:
MSG SEVIRI CHANNELSUSEFUL TO
MONITOR CONVECTION
NIGHT-TIME
Version 0.2, 23 December 2003 Slide: 3
Recommended Channels
WV6.2 upper-level moistureWV7.3 mid-level moisture, early convectionIR10.8 top temperature
Version 0.2, 23 December 2003 Slide: 4
Squall Line over Western Africa causing violent rainfall and sandstormsMSG-1, 14 July 2003, 02:00-08:45 UTC, IR10.8
IR10.8 Top Temperature
Click on the image to see
the animation !
Version 0.2, 23 December 2003 Slide: 5
PART 2:
CHANNEL DIFFERENCESUSEFUL TO
MONITOR CONVECTION
NIGHT-TIME
Version 0.2, 23 December 2003 Slide: 6
Recommended Differences
IR3.9 - IR10.8 particle size, phaseIR8.7 - IR10.8 optical thicknessIR12.0 - IR10.8 optical thicknessWV6.2 - IR10.8 overshooting topsWV6.2 - WV7.3 overshooting tops
Version 0.2, 23 December 2003 Slide: 7
PART 3:
RECOMMENDEDRED-GREEN-BLUE (RGB) COLOUR COMPOSITES
FOR MONITORING CONVECTION
NIGHT-TIME
Version 0.2, 23 December 2003 Slide: 8
Recommended RGBs Night-time
Red: Cloud optical depth, approximated by the12.0 - 10.8 m or 10.8 - 8.7 brightness temperature.
Green:Cloud particle size and phase, approximated by the10.8 - 3.9 m brightness temperature.
Blue: Temperature, provided by 10.8 m brightness temperature.
Version 0.2, 23 December 2003 Slide: 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 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
Version 0.2, 23 December 2003 Slide: 10
Red Green Blue12.0-10.8 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
RGB 10-09 / 09-04 / 09
Version 0.2, 23 December 2003 Slide: 11
4
3
210
2
1
5
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
6
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8
9
115
3:13
1
MSG-111 November 200303:00 UTCRGB CompositeR = IR12.0-IR10.8G = IR10.8-IR3.9B = IR10.8
Version 0.2, 23 December 2003 Slide: 12
MSG-123 April 200319:00 UTCRGB CompositeR = IR12.0-IR10.8G = IR10.8-IR3.9B = IR10.8
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MSG-18 June 200319:30 UTCRGB CompositeR = IR12.0-IR10.8G = IR10.8-IR3.9B = IR10.8
Version 0.2, 23 December 2003 Slide: 14
PART 4:
EUROPEAN EXAMPLES
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Severe Hailstorm Padova-Treviso (I)28 August 2003
Version 0.2, 23 December 2003 Slide: 16
16:30 UTC 17:30 UTC
MSG-1, 28 August 2003, RGB CompositeR=IR12.0-IR10.8, G=IR10.8-IR3.9, B=IR10.8
Version 0.2, 23 December 2003 Slide: 17
MSG-128 August 200317:30 UTCRGB CompositeR = IR12.0-IR10.8G = IR10.8-IR3.9B = IR10.8
Version 0.2, 23 December 2003 Slide: 18
PART 5:
AFRICAN EXAMPLES
Version 0.2, 23 December 2003 Slide: 19
Convection Ghana23 April 2003
Version 0.2, 23 December 2003 Slide: 20
BT [K]
Severe Convection
Thin Cirrus
MSG-123 April 200319:00 UTCChannel 09 BT(IR10.8)
Version 0.2, 23 December 2003 Slide: 21
MSG-123 April 200319:00 - 20:30 UTCChannel 09 BT(IR10.8)
Click on the image tosee the animation !
Version 0.2, 23 December 2003 Slide: 22
MSG-123 April 200319:00 UTCDifference ImageIR3.9 - IR10.8
Version 0.2, 23 December 2003 Slide: 23
MSG-123 April 200319:00 UTCDifference ImageIR8.7 - IR10.8
Version 0.2, 23 December 2003 Slide: 24
MSG-123 April 200319:00 UTCDifference ImageIR12.0 - IR10.8
Version 0.2, 23 December 2003 Slide: 25
MSG-123 April 200319:00 UTCRGB CompositeR = IR12.0-IR10.8G = (IR3.9-IR10.8)iB = IR10.8
Version 0.2, 23 December 2003 Slide: 26
MSG-123 April 200319:00 UTCRGB CompositeR = IR10.8-IR8.7G = (IR3.9-IR10.8)iB = IR10.8
Version 0.2, 23 December 2003 Slide: 27
MSG-123 April 200319:00 UTCRGB CompositeR = IR3.9-IR10.8G = IR8.7-IR10.8B = IR12.0-IR10.8
