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Show HN: The new Windria – 2-5km precision wind forecasts

windria.net

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Re: Show HN: The new Windria – 2-5km precision wind forecasts

#22

Post by imaginenore »

timedivers wrote: post #12
anc84 wrote: post #8

You might want to use some color scales that are perceptually uniform. Right now you are using the bad kind of rainbow for many.

Any pointers where we could look? (we are not designers..)

http://www.windguru.cz/int/help_index.php

Use the standard implemented on WindFinder and WindGuru.

Re: Show HN: The new Windria – 2-5km precision wind forecasts

#23

Post by timedivers »

imaginenore wrote: post #21

What's the source of your data? I get quite different predictions on WindFinder and WindGuru.

Depends on the area. Windfinder and Windguru are using the GFS model which has a resolution of only 50/100km.

For example for winds, in the US we are using NOAAs HIRESW with a resolution of 5km and in Europe we are using mostly WRF models from national agencies with 2-10km resolution depending on area.

Re: Show HN: The new Windria – 2-5km precision wind forecasts

#24

Post by zoner »

timedivers wrote: post #19
zoner wrote: post #18

Interesting. WRF is the model that RASP uses - so surface winds should be similar. It would be nice to have higher level winds there, too, although since that's a sailing site this is probably not a priority for the people behind the site.

We use the WRF-ARW core for some regions, it's a solid model. Haven't considered higher level winds, are you a pilot/paraglider? :)

Yes, would be useful for paragliding.

Re: Show HN: The new Windria – 2-5km precision wind forecasts

#26

Post by vividmind »

timedivers wrote: post #19
zoner wrote: post #18

Interesting. WRF is the model that RASP uses - so surface winds should be similar. It would be nice to have higher level winds there, too, although since that's a sailing site this is probably not a priority for the people behind the site.

We use the WRF-ARW core for some regions, it's a solid model. Haven't considered higher level winds, are you a pilot/paraglider? :)

Glider pilot here. The website looks awesome! Thank you for it! If you guys could add winds at higher levels, it would really be useful for all kinds of sky sailors as well.

Re: Show HN: The new Windria – 2-5km precision wind forecasts

#27

Post by foofoo55 »

timedivers wrote: post #23
imaginenore wrote: post #21

What's the source of your data? I get quite different predictions on WindFinder and WindGuru.

Depends on the area. Windfinder and Windguru are using the GFS model which has a resolution of only 50/100km. For example for winds, in the US we are using NOAAs HIRESW with a resolution of 5km and in Europe we are using mostly WRF models from national agencies with 2-10km resolution depending on area.

Windfinder's Superforecast has a 12km resolution:

http://www.windfinder.com/help#superforecast

Re: Show HN: The new Windria – 2-5km precision wind forecasts

#28

Post by timedivers »

xyclos wrote: post #25

I didn't get a prompt asking for permission to use my location, yet the map was already focused over my location (though the loaded city text was wrong). Any idea what is going on here?

We use your IP to determine your approximate location. Not very precise, but useful because it puts at least in the right country/state, so you don't have to search for it :)

Re: Show HN: The new Windria – 2-5km precision wind forecasts

#29

Post by Brakenshire »

timedivers wrote: post #14
bbayer wrote: post #13

I am wondering how wind directions are calculated? Is there a realistic model that uses height maps and fluid dynamics or just a simple one for visual purposes?

There are many different models, all of them taking into account terrain data, laws of physics and much more: https://en.wikipedia.org/wiki/Numerical_weather_prediction

Does that mean you can possibly also get indications of gusting in direction as well as speed from the terrain? That would be really useful for sailing, particularly inland. Or maybe that's a more local effect, and beyond the resolution of these models?
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