1. Comparison of MSG Overshooting Top Detections and MSG “Storms” RGB Applications
Contents
Cold U/V Storm Tops
Case Study, 5ft November 2007, Denizli, Türkiye
Comparison of MSG OT detections and “Storms” RGB Images
Conclusion
Aydın Gürol ERTÜRK, Turkish State Meteorological Service
Kristopher Bedka, Science Systems and Applications, Inc

2. Detection of Cold U/V Storms using IR Window Channel
Cold U/V shape (or enhanced-V) storms can be detected with IR image, Hemisfield & Blackmer (1988) were introduced a model by using satellite imagery. Cold Area (CA), Close-in Warm Area (CWA) and Distant Warm Area (DWA) are noticeable.
5 Nov 2007, GMT METEOSAT 9 IR10.8 Image.
CA -72, CWA -55, DWA -58 °C.
The Model of V Shape Storms (Heymsfield & Blackmer 1988).

3. Detection of Cold U/V Storms – IR Channel Enhanced
CLOSE-IN WARM AREA -CWA
DISTANT WARM AREA - DWA
COLD-U/V
COLD AREA- CA
5 Kasım 2007, GMT METEOSAT 9 enhanced IR10.8 image.

4. Detection of Cold U/V Storms
Brightness Temperature Difference (BTD) of WV6.2 and IR 10.8 channel is also crucial indicator for convective storms. Positive difference is indicated existence of convection.
Grayscale
5 Nov 2007, GMT METEOSAT 9 IR10.8 Image. Thunderstorm over Southwestern coast of Turkey
IR LUT
5 Nov 2007, GMT METEOSAT 9 BTD of WV6.2 - IR10.8 Image.

5. HRV – Convection (loop)
Ref:
Wang,2007
Cloud top
Cirrus Plume
Gravity waves
IR LUT
5 Nov 2007, HRV Loop. Thunderstorm over Southwestern coast of Turkey

6. Detection of Cold U/V Storms using Storms RGB
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Detection of Cold U/V Storms using Storms RGB
Storms RGB is also crucial application to detect convective storms and Cb tops (yellow) is noticeable. In this case, due to low sun shine (early morning) storms RGB image does not have enough details.
5 Nov 2007, GMT METEOSAT 9 Storm RGB Image. Thunderstorm over Southwestern coast of Turkey

7. Detection of Cold U/V Storms using Storms RGB (loop)
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8. MSG Overshooting Top Detections – 05/11/2007 00 to 23 Z
Grayscale
IR LUT
26 October 2009, GMT METEOSAT 9 IR10.8 image. Cold ring shape storm over Cyprus.

9. MSG IR Images and OT detections (loop)
White dots are OT detections

10. Scatter Plot of Storms RGB Applications
06:00 Z
07:00 Z
08:00 Z
09:00 Z
10:00 Z
11:00 Z
Large and elliptic orange dots for storm cloud tops (OT), thin and non-elliptic for high level ice clouds.

11. Scatter Plot of Storms RGB Applications
06:00 Z
OT Detections
11:00 Z

12. Conclusion Future Work
MSG SEVIRI images (with its 12 channels and 15 minutes temporal resolution) are crucial data sources for nowcasting and very short term forecasting.
MSG OT Detections are quite coherent with Storm RGB Scatter Plot and Enhanced IR10.8 Images
Case study dated 5th November 2007 shows that MSG SEVIRI images quite useful for detection of Cold U/V storms.
Automatic MSG OT detections can be used as a warning tool to support nowcasting applications.
Future Work
This work will continue to compare above results with Radar data and in-situ observation and will be presented in the 2012 EUMETSAT Meteorological Stellite conference.
References:

13. Thank you!