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

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, 06.00 GMT METEOSAT 9 IR10.8 Image. CA -72, CWA -55, DWA -58 °C. The Model of V Shape Storms (Heymsfield & Blackmer 1988).

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, 06.00 GMT METEOSAT 9 enhanced IR10.8 image.

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, 06.00 GMT METEOSAT 9 IR10.8 Image. Thunderstorm over Southwestern coast of Turkey IR LUT 5 Nov 2007, 06.00 GMT METEOSAT 9 BTD of WV6.2 - IR10.8 Image.

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

Detection of Cold U/V Storms using Storms RGB aaaaaaaaaaaaaaa 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, 06.00 GMT METEOSAT 9 Storm RGB Image. Thunderstorm over Southwestern coast of Turkey

Detection of Cold U/V Storms using Storms RGB (loop) aaaaaaaaaaaaaaa

MSG Overshooting Top Detections – 05/11/2007 00 to 23 Z Grayscale IR LUT 26 October 2009, 11.45 GMT METEOSAT 9 IR10.8 image. Cold ring shape storm over Cyprus.

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

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.

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

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:

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