Cloud base in meteogram does not correspond to cloud base in map
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Why is there a difference for the cloud base depicted in the bottom line of the meteogram and the map? Both are labeled with "Cloud base", but don't match. In the city of Salzburg the meteogram shows 200m or less starting at 7:00 a.m. for friday and the map just shows "Data not available for this location". Why is the map not colored accordingly, because the data seems to be there? See screenshot.
The map often shows that there is no data available for cloud base. Because this corresponds with no coloring on the map (and good weather), I always assumed that "Data not available for this location" in the context of cloud base just means that the model says there is no cloud base. Similarly to visibility in aviation weather reports, where "visibility > 10km" is used for superb visibilities greater than 10km, where the precise value does not matter and is not given. On the other hand taken "Data not available for this location" literally the cloud base could be anything. How does this work and should be interpreted?
I would be greatful for some help in understanding this issues and probable limitations of the models etc. that cause this confusion.
best regards
Peter -
Any help on this?
best regards
Peter -
@peterhanns
Where there is no data and no color on Cloud base map, there is no cloud. If there is no cloud, you can understand that there is no cloud base.
Compare Cloud and Cloud base map.
Then to explain the difference between the map and the Meteogram, see this post. -
@idefix37 I think this post does not explain the difference between the map and the meteogram. It explains why the numeric cloud base values at the bottom of the meteogram and the 2D meteogram view differ. The 2D view shows the relative humidity in the atmosphere and the cloud base is taken directly from the ECMWF model. When I view the cloud base layer and select the ECMWF model, I expect to get the same data as in the bottom line of the meteogram, just displayed differently. In the map, it is displayed across an area for a fixed point in time and at the bottom of the meteogram it is displayed across a time period for a fixed point in space. My question does not relate to the 2D view of the humidity in the meteogram.
best regards
Peter -
@peterhanns
I think you should clarify your questions friend.These are mine, after reading your initial post:
- Do we interpret "Data not available for this location" as
- there is no cloud base?
or - data is not available for this location? (ie there may be a cloud base but it's just not available for this location).
- Why doesn't the map layer "Cloud Base" and meteogram "Cloud Base" match?
- Why is there no data available on the map layer, but the meteogram shows 200m or less (0 pink and 200 red colouring)?
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Your screenshot doesn't answer your questions.
First, if you select the Clouds layer, you can see the areas where the model predicts clouds.
Here is my custom Clouds layer:
If you compare it to the Cloud Base layer, no cloud base is displayed (neither color nor data) where there are no clouds.
Then I agree that my quoted message referred to the 2D cross-section of clouds in the meteogram.
But if you compare the cloud base in this meteogram with the map, the values match.
At least, they do in my screenshot. In your screenshot, we can't see the current time.
Note that my last screenshot show the local time while the other show my local time. I should have made them in my time zone.
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@idefix37
I don't know if this is the original intent of the post - but I'm curious to learn why there is no cloud base in the map but there is in the meteogram row.Here is the Clouds layer if interested.
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@Wheats
Yes this is strange and difficult to explain why are the boundaries between areas showing cloud bases and areas without cloud bases so geometric? -
@Wheats said in Cloud base in meteogram does not correspond to cloud base in map:
I think you should clarify your questions friend.
Yes, my post includes two questions. They are listed in your answer nicely. I think I was quite clear, but nevertheless thanks for clarifying.
I think question number 1 is already answered. There is no cloud base according to the map layer, when the weather picker says "Data not available for this location".
- Do we interpret "Data not available for this location" as
- there is no cloud base?
or - data is not available for this location? (ie there may be a cloud base but it's just not available for this location).
I think question number 2 is still open.
- Why doesn't the map layer "Cloud Base" and meteogram "Cloud Base" match?
- Why is there no data available on the map layer, but the meteogram shows 200m or less (0 pink and 200 red colouring)?
@idefix37 said in Cloud base in meteogram does not correspond to cloud base in map:
Your screenshot doesn't answer your questions.
What does this even mean? Of course my screenshot does not answer my question. It is the visual part of the question.
In your screenshot, we can't see the current time.
In my screenshot the time slider is clearly visible.
@Wheats said in Cloud base in meteogram does not correspond to cloud base in map:
I don't know if this is the original intent of the post - but I'm curious to learn why there is no cloud base in the map but there is in the meteogram row.
Yes, this is my main question and the original intent of my post.
@idefix37 said in Cloud base in meteogram does not correspond to cloud base in map:
[...] cloud bases so geometric?
I was wondering that too.
best regards
Peter -
In my screenshot the time slider is clearly visible.
Yes, your time slider is visible, but not the dotted vertical line that we clearly see in the @wheats’s screenshot.
Sometimes this vertical line is offset. So this was the reason of my remark.Cloud base in meteogram does not correspond to cloud base in map
The title of your message remains unanswered. Only a developer could answer the question.
