Missing Wind Intensity Consistent With Legend Colors
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About this version
Target: index.html
Version: 39.1.4 (What's new)
Built: 2023-07-13, 13:05
Started: 2023-07-29T21:13:21.529Z (0m)
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WebGL particles: notWhen I zoom in on an area to the point where the display is of greater detail including streets and similar landmarks the wind time line fails to show wind intensity utilizing the wind velocity colors as displayed on the legend. Wind diretion is displayed in some unknown sense with the arrow size and density meaning not known.
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This is not a bug.
Windy has been working like this for a long time!
When you zoom in to see the detailed base map, the colours of the wind layer disappear to let you see the base map in detail.
If not, would this allow you to see differences in wind speed at this zoom level ?
No, because the resolution of weather models does not allow very fine differences in wind speed or any other parameter to be seen at this zoom level. They are not able to show detailed wind speeds streets by streets !
But at the high zoom levels the animated particles you call arrows are always displayed in dark purple for better contrast with the base map and therefore the wind direction is always displayed, but only the direction. -
@idefix37 - Thank you for the explanation. My confusion is that I'm displaying an area that is over 80km across. I'm reviewing wx models with resolution of single digits - 3 - 9km. - and the wind velocity resolution goes away. So what is the value of a 3 - 5 - 9km model resolution if when the location is zoomed in to 20 - 80km you can't see the results of the model in that area? Seems inconsistent to me. I'm not seeking wind velocity forecast
on a street by street basis. I am seeking it on a range of islands that may be spread out over 30 - 50km. If I zoom out to avoid the detail display the area of interest is a small piece of the overall display and relevant info is seemingly lost. This may well be a reflection of my lack of understanding. I'm very interested in learning. Thank you again. -
@dgillings
It would be useful that you say or show which is your area of interest.
So I take an example from an old thread.
The data from the weather model is provided on a points grid. The distance between these points is the model resolution.
This example is based on the ECMWF model 9km.
Composite image showing the wind speed provided at theoretical grid points by the model with 4.7NM (9km) between the grid points.
Between these grid points wind speed values are interpolated and smoothed.
So there is no real benefit to zooming in (from zoom level 11 to zoom level 12), to see the detail of the base map.
You get more detail from the base map but not in the wind map ! -
@idefix37 Again I thank you. This image of the point grid is excellent and new to me. Being able to create such an assessment tool would fulfill my needs. Is there a tutorial to which you could direct me or can you provide me with the method to create such a grid and related table? For several years I've used Predict Wind and found it valuable for long offshore runs. Now that the offshore runs or shorter with more time hopping around the coast I'm attempting to use Windy and have stepped up to Premium level.
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I do not know if this approach to image sharing will work. The first image is the finest I can zoom and still get wind velocity. The next is one click on the "+" button and with that zoom I lose wind velocity. I was recently trying to p;ick an anchorage among the varioius locations/islands in Boston area with expectation of incoming wx. I wanted more detail than the finest wind velocity grid was providing. I managed to pick an appropriate anchorage and there has to be a more effective approach. I wasn't aware of being able to ue muliple assessment points simultaneouslyl
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@dgillings
Thank you.
With the browser version, a right mouse click (or from the Menu) allows you to use the Distance&planning tool.
This gives an idea of how far the resolution/data grid represents on the map.
I used the HRRR model with a resolution of 3 km. But the tool is not able to display 3 km precisely, it jumps to 3.3 km.
The distance between grid points is useful information on the map. It would be nice if Windy allowed displaying the grid and not just the interpolated values as discussed here:
https://community.windy.com/topic/27270/enable-disable-model-interpolation/2?_=1690805504204
Of course, the points I used are virtual because I don't know their precise location, but the spacing is correct.
The wind map is from my own custom color scale and the forecast is shown for tomorrow.
The wind speed at each grid point was noted using the weather picker.At zoom level 11:
At zoom level 12:
So you see that the zoom cannot bring more precision. Wind speed pattern detail is not improved.
It's like zooming into a low resolution image, it doesn't add more detail because the pixels are already too large.
In fact it is the interpolation process which gives the illusion that zooming in could provide more details...
