Transcript RGB products for Operational Forecasting – EumetSAT

Australian VLab Centre of Excellence
National Himawari-8
Training Campaign
Introduction to the Severe
Convection RGB product
(Africa, Spain)
Part 1a: Instructions
• Now that you have downloaded the PowerPoint file, please read the
Instructions in Parts 1a (this slide) and familiarise yourself with the
Learning Outcomes in slide 1b (next slide)
• Print out the Worksheet in Part 2a of this file (if applicable)
• Examine the Pre-activity Resources in Part 2b of this file (if applicable).
• Download the appropriate accompanying Video Recording (.wmv file).
The recording is typically of 3-13 minute duration.
• Commence listening to the Recording. Pause the Recording whenever
you want to annotate notes on the Worksheet.
• You may wish to examine the slides in Part 3 of this file in Slideshow
mode when you stop the Recording. Note that Rapid Scan imagery in
the animations embedded in the PowerPoint slides is often clearer than
in the Recording.
• Towards the end of the recording, recommended answers for the
exercises are sometimes given.
Part 1b: Learning Outcomes
At the end of this exercise you will:
• Have a basic knowledge how the Severe Convection RGB product is
constructed from multiple satellite channels and the physics and
meteorology underpinning this.
• Have a better understanding of the advantages and the limitations of the
Severe Storm RGB product in comparison with infrared satellite imagery in
the operational monitoring, nowcasting and short term forecasting of
thunderstorms.
• Have a better appreciation of using the Severe Storm RGB in rapid scan
animation when monitoring, nowcasting and short term forecasting of
thunderstorms.
• Note – corresponding WMO-1083 Capabilities and BOM Enabling Skills are
given on the link "Learning Outcomes" on the National Himawari-8
Training Campaign homepage.
Part 2a: Worksheet for the exercise
• The worksheet " The Severe Convection RGB vs the 10.8 micron
infrared channel" is on the next slide. Please print this slides out
and use it to make your notes
Part 2b: Pre-activity resources
• Please study the four slides of Part 2b to familiarize yourself with the
Severe Convection RGB product.
Part 2a: The Severe Convection RGB vs the 10.8 micron
infrared channel
Question – what additional
information does the Severe
Convection RGB give you, compared
to the 10.8 micron infrared channel ?
Additional comments
Your answer:
Part 2b: RGB products for Operational Forecasting –
EumetSAT recommendation – Day Severe Convection RGB
Two RGB composites which complement each other
Airmass RGB
24 hour Microphysical RGB
Five application specific RGBs
Day
Microphysical
RGB
Night
Microphysical
RGB
Day Severe
Convection
RGB
Snow / fog
RGB
from RGB Products
Overview (RGB Tutorial)
J. Kerkmann EumetSAT
Natural
Colours RGB
Part 2b: Severe
Convection RGB
beams
explained
BTD6.2−7.3
Overshooting Cb clouds have near zero or even slightly positive
BTD6.2−7.3. The surface shows large negative BTD6.2−7.3 values.
(Lensky et al. 2008). The stormtops have a strong red signature
IR3.9-IR10.8
Large ice particles +26 to +35 K. Small ice particles +65 to +73 K.
(Kerkmann). Small ice crystals have a strong green channel signature
1.6-0.6
reflectance
Large negative RD1.6−0.6 indicates ice clouds – black in the RGB
Much larger RD1.6−0.6 is typical for the surface. (Lensky et al. 2008
Combining beams
•
Yellow is made by mixing red and green
•
Magenta is made by mixing red and blue
•
Cyan is made by mixing green and blue
from http://oiswww.eumetsat.org/IPPS/html/bin/guides/msg_rgb_dust.ppt
Part 2b: Severe Convection RGB beams
explained
Small ice particles (high RED component, high GREEN component, 0 Blue component)
Large ice particles (high RED component, weak GREEN component, 0 Blue component)
from http://oiswww.eumetsat.org/IPPS/html/bin/guides/msg_rgb_dust.ppt
Part 2b: Severe Convection RGB beams
explained
Ocean
Land
•
Yellow is made by mixing red and green
Combining beams
•
Magenta is made by mixing red and blue
image from "Understanding Convective Clouds
through the eyes of MSG", J. Kerkmann EUMETSAT
•
Cyan is made by mixing green and blue
Part 3: The Day Severe Convection RGB
Image from EUMETSAT
MSG-1
5 September 2004
15:00 UTC
Beam
Channel
Range
Gamma
Gamma 2
Red
WV6.2 - WV7.3
-35 ... +5 K
1.0
1.0
Green
IR3.9 – IR10.8
-5 ... +60 K
0.5
1.0
Blue
NIR1.6 – VIS0.6
-75 ... +25 %
1.0
1.0
Part 3: Some examples of the
Severe Convection RGB –
Aqua/Terra MODIS imagery
Burketown
Hilo
North Australia 1 November 2009 (0435 UTC)
Singapore
Hurricane Iselle 8 August 2014 (2315UTC)
images courtesy NASA/EOSDIS/Lance Rapid Response
Singapore
Sumatra Squall line 4 July 2005 (0350UTC)
Part 3: The Severe
Convection RGB vs 10.8
micron infrared channel –
equatorial Africa
Question – what additional
images from EUMETSAT
information does the Severe
Convection RGB give you,
compared to the 10.8 micron
infrared channel ?
Your answer:
Other comments:
Infrared image
images from EUMETSAT
Exercise 5: Severe Storm RGB animation
• Visit the EUMETSAT Image Library case study of the
Major Thunderstorms over Paris and Berlin' at
http://www.eumetsat.int/website/home/Images/ImageLibr
ary/DAT_IL_07_05_25.html
• Download the MPG "Animation" of the bottom right hand
panel (Met-8, 25 May 2007, 13:04 UTC)
• Please play this animation.
Part 3: Severe Convection RGB animation – Spanish Peninsula 25th
May 2007, Meteosat-8
Images from EUMETSAT