Some Questions:
This time period comprises the early stages of the Rapid cyclogenesis up to the development of a distinct spiral structure.
- During the first stage of a racy there is the cloud head stage:
- Where is the cloud head and how long can you observe it?
- The next stages of a racy show the cloud dissolution in the area of the developing surface low
- From when on can this be observed and where does it take place in relation to the cloud head and to the main frontal cloud band?
- Is there already a spiral structure recognisable?
Some Questions:
This is the fully developed phase of the surface low of a rapid cyclogensis. Several changes and developments are ongoing in this area.
- In the stage of a fully developed surface low of a racy the following cloud sysetms are to be considered: the main frontal cloud band - the
cloud spiral - the cloudfree/-poor low centre
- Describe these features in the beginning of this phase
- There is a stage where the surface low is increasing; which of the following features can you recognise in this case
- A heavy increase of the spiral configuration
- An increase of the cloud free low centre
- The development of convective cloudiness at the boundary between cloud spiral and low centre
- The dissolution of the main frontal cloud band at the boundary of the low centre
- An indication of the jet axis? If yes, In which way?
- Are there other features detectable in this situation? Look into the eastern- und innermost part of the spiral of the low centre.
Some Questions:
This is a phase where a second surface low develops and different histories can be observed for the first and the second low.
- As already recognisable in the end of the phase before, there is a secondary spiral development in the easternmost part of the first main low centre
- Describe the history of the two spirals during this phase
- What is the path of the first and the second low centre
- Which of the typical features can be seen in the second low development
- A heavy increase of the spiral configuration
- An increase of the cloud free low centre
- The development of convective cloudiness at the boundary between cloud spiral and low centre
- The dissolution of the main frontal cloud band at the boundary of the low centre
Some Questions:
This time period comprises the early stages of the Rapid cyclogenesis up to the development of a distinct spiral structure.
- The most important feature in the WV images during the first stages of development is the black stripe
- Can you observe it in this case?
- Where can it be found in relation to the cloud head and the main frontal cloud band
Some Questions:
This is the fully developed phase of the suface low of a rapid cyclogensis. Several changes and developments are ongoing in this area.
- In the stage of a fully developed surface low of a racy the following cloud systems are to be considered: the main frontal cloud band - the cloud
spiral - the cloudfree/-poor low centre
- Describe this features in the beginning of this phase from the viewpoint of the WV image
- There is a stage where the surface low is increasing; which of the following features can you recognise in this case concentrating on the WV
features:
- An increase of the black (dry) low centre
- The development of convective cloudiness at the boundary between cloud spiral and low centre
- The dissolution of the main frontal cloud band at the boundary of the low centre can be seen in the IR image. Is such a cloud dissolution also seen in the WV and in which channel is it better recognisable and why?
- An indication of the jet axis? If yes, In which way?
- Are there other features detectable in this situation in the WV image? Look into the eastern- und innermost part of the spiral of the low centre.
Some Questions:
This is a phase where a second surface low develops and different histories can be observed for the first and the second low.
- As already recognisable in the end of the phase before, there is a secondary spiral development in the easternmost part of the first main low centre
- Describe typical features in the WV image if existing
- Which of the typical features can be seen in the second low development
- An increase of the black (dry) low centre?
- The development of convective cloudiness at the boundary between cloud spiral and low centre?
Some Questions:
The Air Mass RGB helps to discriminate between cold (blue shades) and warm (green shades) air masses as well as upper level dry air masses (brown shades). One of the most important applications of the Air Mass RGB is the visualisation of areas with dry, stratospheric air protruding downward from above. These are the dark-red/brown stripes and areas.
This time period comprises the early stages of the Rapid cyclogenesis up to the development of a distinct spiral structure.
- During the first stage of a racy there is the cloud head stage:
- Is the cloud head overrun by dry air or not? Explain your answer in terms of the RGB colours
- If there is already the dissolution of frontal cloudiness - can this be seen in the RGB? Explain your answer in terms of the RGB colours
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to bring up the RGB key!
Some Questions:
This is the fully developed phase of the suface low of a rapid cyclogensis. Several changes and developments are ongoing in this area.
In the stage of a fully developed surface low of a racy the following cloud systems are to be considered: the main frontal cloud band - the cloud spiral - the cloudfree/-poor low centre.
- Interpret these features in the beginning of this phase in terms of air masses: cold, dry, dry-overruning, cold-overrunning
- Are there additional features detectable in the air mass RGB or are there features easier detectable in the RGB?
- The development of convection?
- Dissolution of front cloudiness?
- Early recognition of the development of the second spiral?
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to bring up the RGB key!
Some Questions:
This is a phase where a second surface low develops and different histories can be observed for the first and the second low.
In the stage of a fully developed surface low of a racy the following cloud systems are to be considered: the main frontal cloud band - the cloud spiral - the cloudfree/-poor low centre.
- As already recognisable in the end of the phase before, there is a secondary spiral development in the easternmost part of the first main low centre
- Describe the history of the two spirals during this phase in terms of air mass characteristics
- Can some of the features in the second low development be seen easier in the air mass RGB than in IR or WV? Which is the best channel for this?
- The development of convective cloudiness at the boundary between cloud spiral and low centre; is there dry air above or not?
Click on the
to bring up the RGB key!