What source of weather data Windy use?
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@jmh2002
My opinion:
Satelitte layer must be "mixed" with isobars and/or other isolines
ONLY if those isolines reffer to the time of sat. image (plus/minus 1 hour).
I agree with idefix37 that theoretically is wrong to mix forecast and observations
but practically I like to have sat. + isolines (isohypses) at 850 or 700 hPa
to predict the direction of thunderstorms movement. -
I think the best would be to clearly display on UI the validity time of the static data displayed on isolines layer (pressure, temperature, etc.).
This way I think nobody would say that it is a bug: users should easily understand this.
It is the same as when displaying a time series of observed data today AND of the data observed one year ago, on the same 2D plot; this is often used in analysis and it is really useful when the validity time of each time series is clearly labelled. -
@jmh2002
I don’t think a warning pop up would be a good idea (it is not in the Windy culture). IHMO it could be done automatically when isobars are selected together with satellite layer i.e. isobars should be displayed at about same hour as the last satellite observation as @Gkikas-LGPZ said.
I think this is possible in the same way as when you select Rain accumulation with ECMWF at 10 days and switch to ICON, the time lapse is automatically set back to 12h. -
Please review these last comments and note and discuss with the development team regarding how this can be improved, thank you :)
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You mention that NEMS is only available in Europe.
But, I'm based in Hong Kong, and METEOBLUE is shown, besides GFS and ECMWF, as models for this location.
Why?
Thank you!
Peter S -
@peteraschindler Hello, NEMS is a local weather model created by Meteoblue. Meteoblue model is only available in the detailed forecast and yes, it is global model.
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@peteraschindler
Find here additional information about the difference between NEMS and METEOBLUE. It is called Meteoblue AI by this forecast provider:
https://community.windy.com/topic/10316/metoblue-wildly-inaccurate-in-the-sw-usa/4?_=1588859394205 -
@peteraschindler
Meteoblue is a Swiss company who developped a global model called NEMS. With this model, you can get weather forecast all over the world as this a global model, as GFS for instance. -
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What is the data source for satellite? How does Windy get it from EUMETSAT?
If it is EUMETCast Satellite Europe - Ku-band than what do you get from it?
Does Windy pay EUMETSAT for it?
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@yqw Hello, the source is Eumetsat and data are displayed based on the contract.
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@sv1aaw That would be great. WU was extremely accurate until Weather.com bought them and they dismantled the PWS network. I am in Central America and the WU 6 hour graphic forecasts could be relied upon. It was a game to see how accurate they were to the quarter hour.
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Is it possible to default to NAM instead ECMWF?
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@howardkuo
The default model of Windy is the model from ECMWF. It is not possible to set another model as default. -
@dzuremar said in What source of weather data Windy use?:
@idefix37 Hello ! We use AROME with resolution 0.01° (1.3km). Both of the AROME resolutions have 00, 06, 12 and 18 ref time runs. There are also 03, 09, 15 and 21 ref time runs which we don't process. Advantage of AROME 0.025° (2.5km) is that it includes pressure-level layers. AROME 0.01° provides only surface-level layers, only wind and relative humidity are additionally in 20m, 50m and 100m altitude. However, AROME 0.025° also covers much smaller area - a square that covers whole France and a bit of surrounding area.
It seems that the AROME 0.025 now cover the same area as AROME 0.01. Is there any chance that Windy switch, or add AROME 0.025 to the supported models? The area of new icon D2 is quiet small either. The french paragliding community badly needs the pressure layers on the AROME model
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Hello, my first message/question in the community hope no problem to ask such question. Which model you suggest to use in sailing in Turkish Aegean and Mediterranean coasts ? Thanks
Arda -
@arda-gulcil Hello, I recommend trying all the available models to find the best one for the location.
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@arda-gulcil
Hi,
I would not recommend only one model.
You know there are models providing long-range forecast (up to 10 days) and some short-range forecast (up to 2 days). The first ones have a lower resolution (about 10km or more), the second ones have a higher resolution (about 4km) in your area.
So the first ones are useful to know the weather in the next 5 or 7 days.
In this category I would recommend the ECMWF model, for instance to know if the Meltem wind is predicted to be strong next week.
For medium-range forecast try ICON EU
And for the shorter-range forecast it is better to use NEMS as this Mediterranean area shows a large quantity of mountainous coasts and islands. So you need a high resolution model to get more precision about wind force and direction. Local winds are highly influenced by mountains in the Aegean Sea.Examples today at same hour
(shown with customized colours for wind):ECMWF 9km resolution - 10-days range.
The Meltem strength is shown to be fairly even.
ICON 7km resolution - 5-days range
The wind is shown stronger between islands and weaker on leeward coasts.
NEMS 4km resolution - 2.5-days range
The wind is shown even more accurately around islands and capes.
My colour scale for wind is
Blueish green : 4 Beaufort
Bright green : 5 Beaufort
Orange : 6 Beaufort -
@idefix37 thank you very much ,crystal clear.
