Detection and Monitoring Convective Storms by. Using MSG SEVIRI Image. Aydın Gürol ERTÜRK. Contents

Transcription

1 Detection and Monitoring Convective Storms by 1 Using MSG SEVIRI Image Contents MSGView Software Cold U/V and Ring Shape Storm Tops Case Study, 2nd April 2011 Antalya, Türkiye Conclusion Aydın Gürol ERTÜRK

2 2 MSGView Software and its Specifications

3 MSGView v3.4 MSG Image Processing & Display SW

4 MSGView - Features Development For MS Windows platform (XP, Vista, Win7) Developed by using Borland CBuilder 6 Easy to install by setup file No need powerful PC User friendly interface Running at Weather Forecast Center at TSMS HQ 4 Regional Weather Forecast Center ITU Met Engineering Division EUMETSAT User (Trial Version) More than 60 individual or Institutional users all over the World. (i.e. Europe, South Africa, USA, China) Ash RGB IR 10.8 Enh

5 MSGView - Features Full Disk Display (1/4 downsizing) Single Channel RGB Composite Partial Display Single Channel Channel Difference RGB Composite Channel Difference RGB Composite IR 10.8 Land-Sea Mask VIS 06 Single Channel Display Gray Scale LookUp Table (Customize) Land/Sea Mask Coast Lines City Locations (Customize) Animation Easy to make animation Animation tools Add latest image into image (optional) Adjust animation speed Creat mpeg file

6 MSGView - Features More Save image as JPEG Check new data Automatically display latest image (optional) Specifications panels can be removed for wide display Save image as physichal value (Radiance, Reflectance or Brightness Temperature) Display EUMETSAT U-MARF HDF5 formatted MSG data. Animations can save as Mpeg file. Single Channel Display with specific scale (New) Volcanic Ash and Snow RGB (New) MSG1 RSS Data Display (New) Snow RGB Ash RGB

7 Zoom and See Details Airmass RGB

8 Make Tour Own RGB s or Difference Images

9 Create Daily Vegetation Index (NDVI) Daily MSG NDVI for full disk or selected area are possible to prdocue. Product is saved as HDF5 file format.

10 Scatter Plot Diagrams To Analyze RGB Images Scatter plot diagrams are avaliable for the RGB composite image.

11 Save Image as Physical Values (BT or Reflectance)

12 Select Cycles and Make Animation Dust RGB MSGView Software is free, if you would like to get a copy please send an to agerturk@dmi.gov.tr or look at the announcement at or web sites.

13 Cold U/V & Ring Shape Storm Tops Features by Using MSG Imagery

14 SEVIRI Channels & Applications SEVIRI Channels VIS0.6 VIS0.8 NIR1.6 IR3.9 WV6.2 WV7.3 IR8.7 IR9.7 IR10.8 IR12.0 Applications Optical tickness Optical thickness, vegetation Ice&snow detection, particle size & phase Ice&snow, particle size & phase, fire, fog, sun glint, SST Upper level moisture Mid level moisture Top temperature, dust Ozone Top temperature, cloud analysis, convection, CTH Top temperature, LST, SST IR13.4 CO 2 HRV Cloud detail (1 km)

15 SEVIRI Channels & RGB Composites for Convection Window Channels (IR10.8, IR12.0 & IR 8.7) - CTT, CTH NIR1.6 & IR3.9 Particle size and cloud phase WV Channels - moisture Storms, Airmasses, Date and Night Microphysics RGB HRV Cloud detail, anvils

16 Detection of Cold U/V Storms using IR Window Channel Grayscale It is difficult to see storms top structure with gray scaled IR image but enhanced ones with appropriate look-up table gives more details. IR LUT 5 Nov 2007, GMT METEOSAT 9 IR10.8 Image. Thunderstorm over Southwestern coast of Turkey

17 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. The Model of V Shape Storms (Heymsfield & Blackmer 1988). 5 Nov 2007, GMT METEOSAT 9 IR10.8 Image. CA -72, CWA -55, DWA -58 C.

18 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.

19 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.

20 HRV Convection Ref: Wang,2007 1) 2) 3) Cloud top Cirrus Plume Gravity waves IR LUT 5 Nov 2007, GMT METEOSAT 9 HRV Image. Thunderstorm over Southwestern coast of Turkey

21 HRV Convection Grayscale IR LUT 5 Nov 2007, HRV Loop. Thunderstorm over Southwestern coast of Turkey

22 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

23 Detection of Cold U/V Storms Airmasses RGB 06:00 06:30 07:00 07:30 07:45 08:00 Grayscale 5 Nov 2007, 06:00-08:00 GMT Airmasses RGB Images. Thunderstorm IR LUT over Southwestern coast of Turkey 23

24 Detection of Cold Ring Storms using IR Window Channel Ref: Setvak at. al.,2007 CENTRAL WARM SPOT - CWS Grayscale COLD RING IR LUT 26 October 2009, GMT METEOSAT 9 IR10.8 image. Cold ring shape storm over Cyprus.

25 Detection of Cold Ring Storms using IR Window Channel Grayscale IR LUT 26 October 2009, GMT METEOSAT 9 IR10.8 image. Cold ring shape storm over Cyprus.

26 Detection of Cold U/V Storms Using HRV Image Cb top and gravity waves are easly noticed from HRVIS image. 26 October 2009, GMT METEOSAT 9 HRVIS image. Cold ring shape storm over Cyprus.

27 Cold Ring Storms BTD of WV6.2 - IR10.8 Channels 11:30 11:45 11:30 11:45 26 October 2009, 11: , Storms RGB composite (up) BTD WV6.2-IR10.8 Channels (down). Cold ring shape storm over Cyprus. IR LUT

28 Convection - IR Window Channel Applications Squall Line Enhanced IR Grayscale IR LUT 26 March 2007, GMT METEOSAT 9 IR10.8 Image with a special color table. Squall line over Saudi Arabia

29 Convection Storms RGB & Airmasses RGB Composite Grayscale IR LUT 26 March 2007, GMT Storms RGB (left) and Airmases RGB (right) composite Image.Squall line over Saudi Arabia

30 Convection IR 108, Diff WV and Storms RGB Composite Grayscale 26 March 2007, GMT IR10.8 (left), BTD of WV channels (mid) and Storms RGB composite(right).

31 Convection Scatter Plot Diagrams For deep convection (yellow) Grayscale reflectance differences of VIS06 and NIR16 is around %35-45, BT of IR108 is around K, BTD of WV channels is around -3 and 1 K and BTD of WV62 and IR108 is around -2 and 2 K. IR LUT Convection is well recognized with the scatter plot diagrams. The colours are same as Storms RGB composite image 26 March 2007, GMT Storms RGB composite and scatter plot diagrams.

32 Case Study : 2 April 2011 Hail Storm over Antalya, Türkiye

33 Hail Storm, 02 April 2011 over Antalya A severe storm effected over Aksu town near Antalya city at 2nd April 2011, around 13:00 GMT, a lady was dead, many green-houses were destroyed and economic loses are around hundreds of millions USD. Hailstones (over 2 cm diameter) were covered over land around 10 cm. 2 April 2011, 13:00 UTC Airmasses RGB image.

34 Cold Ring Shape Storm 02 April 2011, Antalya 12:45 13:00 13:15 12:45 13:00 13:15 2 April 2011, 12:45 13:15 enh. IR 10.8 image (up) and HRV image (down). Cold ring shape storm over Antalya.

35 Cold Ring Shape Storm 02 April 2011, Antalya 35 HRV IR LUT Enhanced IR 10.8 loop (up) and HRV loop (right). Storm cell seems very small but it caused severe weather. This case shows that cold ring shape storms can be casued severe weather even if it is small size.

36 Conclusion MSG SEVIRI images (with its 12 channels and 15 minutes temporal resolution) are cruical data sources for nowcasting and very short term forecasting. MSGView software has many features for utilising, display and animate MSG images and RGB composites. Usage of this software is free. Enhanced IR images, BTD s images and RGB composite images give a possibility to detect convective storms especially Cold U/V and Cold Ring shape storms cloud tops. Case study dated 2 April 2011 shows that it is possible to detect cold ring shape storms before minutes by using MSG SEVIRI images and applications. References: Ertürk A. G., 2010 "MSGView: An operational and training tool to process, analyze and visualization of MSG SEVIRI data", /Proceedings of 10th EUMETSAT Conference/, EUMETSAT P.57, Darmstadt, Germany, Heymsfield, G. M. and Blackmer R. H., 1988: Satellite-observed characteristics of Midwest severe thunderstorm anvils. Monthly Weather Review, 116, Setvák, M., Lindsey, D. T., Novák, P., Wang, P. K., Radová, M., Kerkmann, J., Grasso, L., Su, S., Rabin, R. M., Šťástka, J., Charvát, Z., 2010 Satellite-observed cold-ring-shaped features atop deep convective clouds. Atmos. Res. 97, Wang, P.K., The thermodynamic structure atop a penetrating convective thunderstorm. Atmos. Res. 83,

37 37 Thank you!