Monitoring (RGBs and Differences)

"Let me first recapitulate the topics and questions we tried to answer in our first basic Nowcasting with the IR image only. The questions were:

Will the cell pass over Dijon and during which time period?
During the next time period the cell increases and merges with another cell. At which point of time can you be sure about this process for the first time?
If you follow the movement of the cell across the city Dijon till 09.30 can you see some substructure in the cell?
Is there a change goinig on especially a merging of the cells and if yes, when does it happen?
Does the convective cell move over the city Zürich and if yes, how long does it last?
At 12.00 Bregenz is located in relation to the cloud cell ...
Does the city Salzburg get under the influence of the northwestern cell (centered in Bavaria) or the southeastern cell (centered in North Italy and Southern Tyrol)?
Is Salzburg crossed by the part with the coldes cloud tops during this time period?

There are three groups of questions:
1.) Will convective cells pass over a city, when and how long will it last?
2.) Will a merging of cells appear?
3.) Are there substructures within the cell and do they move over a special place/city?

Can you answer all or at least some questions now better with the air mass RGB? "

Dijon (07.00 - 09.30)

In the basic nowcasting chapter there was the question: "If you follow the movement of the cell across the city Dijon till 09.30 can you see some substructure in the cell?" The correct answer from the false colour images was "Yes, there is a substructure with colder cells embedded". Using the interpretation key of the deep convection RGB: is there even more content in the RGB images?

Between 7.30 and 8.30 Dijon is fully situated below the convective cell complex. The colour of the RGB indicates ...

Deep precipitating cloud which do not necessarily reach the ground
Several Cb cloud with strong updrafts and severe weather
Only thin cirrus

From 9.00 h on the yellow colour becomes more light and pale. This means that ...

Only cirrus is left
Convection is becoming stronger
Convection is becoming less intensive

Bern (10.00 - 11.15)

In the basic Nowcasting chapter the question was if there was a merging of the three cells from 10.45 on. With the RGB we can ask for more detail.

What is the structure of the big convective cell at 10.45 to the SW of Bern?

There are some small cb cloud with sever weather embedded
There is only precipitating cloud not necessarily reaching the ground
There is only thin cirrus

Zürich (11.30 - 12.30)

In the basic nowcasting chapter the main questions concerned the period of passage of the cell across the town Zürich.

What is the structure of the big convective cell at 11.45 when Zürich is immediately at the downstream edge of the big convective cell?

There are several CB clouds with severe weather embedded
There is only precipitating cloud not necessarily reaching the ground
There is only thin cirrus cloud

Bregenz (12.00 - 14.00)

In the basic nowcasting chapter the question was where Bregenz is situated at 12.00 in relation to the big convective cell. The correct answer was in the downstream part of the cell.

What is the structure of the convective cloud at this point of time in this area?

There are CB clouds with severe weather embedded
There is only precipitating cloud not even reaching the ground
There is only thin cirrus cloud

What is the structure of the big convective cell at 13.00 when Bregenz is in the middle of the big convective cell?

There are CB clouds with sever weather embedded
There is only precipitating cloud not even reaching the ground
There is only thin cirrus cloud

What is the structure of the big convective cell at 14.00 when Bregenz is crossed by the big convective cell?

There are some CB clouds with severe weather embedded
There is only precipitating cloud not even reaching the ground
There is only thin cirrus cloud

Salzburg (14.00 - 16.15)

In the basic Nowcasting chapter the question was if the city Salzburg is crossed between 15.00 and 16.15 by the coldest tops of the bid southern convectice cell. The answer was "No. it remains to the north of this area". Is this confirmed by the RGB images?

Can during the passage from 14.00 to 15.30 some severe weather connected to Cbs be expected to cross Salzburg?

No, not at all, between the two cells there is only thin cirrus
Yes, a line of yellow coloured Cbs, develops in the transition area and crosses the town

"In the false coloured images I can identify cold cloud tops but they could also be connected to high cirrus alone. In the RGB the colours give me hints about the vertical distribution of the cell, about the existence of deep convective cells embedded and henc the weathert acivity of a convective system.
So what I can say is that the best combination of methods would be the RGB methods an some quantitative estamation of displacement into the future. "

	Answer Possible	No answer possible, but some hints	No answer possible
Formation of Convective Cells
Life Cycle of Convective Cells
Arrival Time of Convective Cells
Low/High/Multilevel cloud
Arrival Time of Rain Area
Existence of Thunderstorms
Arrival Time of Thunderstorms

EUMeTrain: Nowcasting CAL Module - RGB Nowcasting

Convection