How to read Meteogram

[Korina]

Here is a description of units in Meteogram

Displayed temperature and dew point represents values 2m above the surface.

Wind displays average wind speed 10m above the surface level.
Wind gusts display values 10m above the surface in the last 3 hours.

Shaded area symbolises temperature on the upper side and dew point on the lower side. Color matches with the values given, corresponds with the color scale.

Temperature is close to the dew point = air is humid
The difference between temp. and d.p. is bigger = air is dry
Dew point and temp. are equal = relative humidity is 100% (fog)

800h is short for 800hPa
5km and 6400ft represent elevation both in meters and feet
FL100 is short for Flight Level 10000ft

Atmospheric pressure asl
Some values of this curve are shown in the hPa line.

Different colors of precipitations are explained in the Meteogram detail.

Deep blue = rain
Pink = convective rain
Light blue = snow

Grey clouds in Meteogram are calculated from relative humidity. It can be explained as a distribution of water in the atmosphere. The height in the Meteogram is in pressure levels. km/ft values are only rough estimation and they are AMSL.

[Yves70]

@korina
Very nice summary Korina. Will be useful for a lot of users !

[Gkikas LGPZ]

@korina
Please add explanation for the shadows of gray.
I think represent relative humidity aloft (not clouds). Isn't it?

[hgk209]

Thanks for the descrition. I have a question about the gray shades (relative humidity?) on the bottom of the meteogram. It appears that there are 7 shades of gray. How do the shades of gray and the relative humidity correspond (Whitch shade of gray represents what level of humidity)?
Thanks.

[Yves70]

@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

@Korina
@ivo
Could you let us know ? Thanks

[idefix37]

Please find additional information about Meteogram and cloudiness:

https://community.windy.com/topic/10309/cloudbase-meteograms?_=1608981618271

[Yves70]

@idefix37
Thanks, this is clear now. Grey shades in the meteogram are linked to relative humidity, not cloud cover

[Yves70]

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

[marketingzet]

thanks for sharing..

[crazycats]

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 hills

thanks so much in advance.

kind regards

[idefix37]

@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.

[galtsev]

hello, how to enable the map "globe" ??

[Korina]

@galtsev Hi, we do not offer globe yet, so it is not possible to view it.

[zzzzzzxxx]

Где тут можно вопрос задать ??? Не могу найти

[Yves70]

@zzzzzzxxx
What is the subject of your question ?

[zzzzzzxxx]

Почему высота над уровнем моря у меня на Туристической карте уже не показывает?

[Cougar83]

@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

@Korina
@ivo
Could you let us know ? Thanks

[Yves70]

@cougar83
Grey shades in the meteogram are linked to relative humidity, not cloud cover

[angus 4]

@gkikas-lgpz

[fhamilton36]

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?