How to read Meteogram
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Having said that, relative humidity is a great tool to better understand, very quickly, the situation and even if you cannot completely linked cloud cover and relative humidity, they are both linked in a way.
Cloud maps are still necessary to assess the real cloud cover, knowing that in any case, those cloud maps are not super accurate,...
Sounding can complete the analysis -
thanks for sharing..
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That's a very helpful guide for a beginner like me with the app. Now some noob questions -
a. I didn't quite get the Shaded area description
b. how do I check that there's only high clouds at a site and say in the direction of sun no low/middle clouds
c. how do I check for cloud inversion from a hilltop in a valley. sometimes its also referred as low clouds / fogs but following that had me stuck in thick fog on hillsthanks so much in advance.
kind regards
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@crazycats
Hi,
a. Which shaded area are you referring? In Meteogram the explanation is given in posts here above.
b. Check High, Medium and Low clouds layers. If necessary see More layers... The direction of the sun is given by a plugin only available on website. Menu > Install plugins > Sun position
c. You probably mean in case of temperature inversion, which brings a cloud / fog layer below the inversion. You can check that by using the Sounding feature. Right click on mouse.
- Temperature inversion when the temperature (red curve) is increasing with altitude instead of decreasing.
- Clouds when temperature and dew point are close together (red and blue curves)
Note that the weather model can only show this phenomenon at large scale but not in local conditions like in a mountain valley.
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hello, how to enable the map "globe" ??
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@galtsev Hi, we do not offer globe yet, so it is not possible to view it.
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Где тут можно вопрос задать ??? Не могу найти
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@zzzzzzxxx
What is the subject of your question ? -
Почему высота над уровнем моря у меня на Туристической карте уже не показывает?
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@yves70 said in How to read Meteogram:
@hgk209
First of all, we should get the confirmation about the exact meaning of the shades of grey. Is it humidity level or cloud cover ? High level of humidity doesn’t necessary mean clouds -
@cougar83
Grey shades in the meteogram are linked to relative humidity, not cloud cover -
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That's great. What if I want to plan sailing from the Chesapeake to the Grenadines, a few months in advance. Is there historical data?
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@fhamilton36
No Windy does not provide historical data.
Better to use the Pilot Charts than verifying days after days what was the weather during the last 10 or 20 years:
https://community.windy.com/topic/9788/historical-wind-data?_=1619461576536 -
Hello!
If there is rain in the Meteogram at 4AM, does it mean it will rain from 1AM to 4AM, from 2:30AM to 5:30AM or from 4AM to 7AM? Thank You! -
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@vsinceac Thank You!
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Hi, I've just found that the values of the 'last 3 hours' precipitation are different in the Meteogram and the layer data. For example, in this picture (https://imgur.com/k0uKcEq), the value derived from the weather picker is 71mm, but the value from the basic Meteogram on the same point is 92mm, which one is correct? Is it resulted from the different definition of the two rainfall value?
Another question is, the value of 'Rain' in Meteogram is 78mm, and the convective rainfall is 14mm. And the sum of them is equal to the value in the basic meteogram, 92mm. So the 'blue Rain' term is actually the 'large-scaled precipitation?' and the value 92mm is the total precipitation, the sum of large-scaled and convective precipitation, right?
Thank you!
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@greatkingnan Hello, the values are different since they are calculated differently. The Rain, Thunder layer shows accumulation in the last 3 hour.
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@korina Thanks! So the value in Meteogram is the precipitation accumulated over a quite different time period compared to the Rain & Thunder layer? What's the time period you'd applied to do the calculation?
And I'd like to know whether the value of 'rain' in Meteogram & Airgram represents the large-scale precipitation or not? According to the description of parameter on ECMWF's website, total precipitation is the sum of large-scale & convective precipitation. It seems that the total amount of precipitation has been split into two parts in the bar graph in Meteogram: the large-scale term and convective term. Furthermore, the sum of 'Rain' and 'Covective' is exact the value in basic list, which might indicates the total precipitation. As a result, the term 'Rain' might be interpreted as the large-scale precipitation part in Meteogram.
