191–200 of 222 posts
I really like Windy's base maps. How did they generate them and what's the style?
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By default, Windy uses the ECMWF weather model. You can also change it to GFS or ICON, which many american forecast websites use. ECMWF, GFS and ICON are made by national/international forecasting agencies. IBM also has its own proprietary weather forecasting service, notably used by The Weather Channel. Other apps mostly use one of these models or aggregate predictions from different services (e.g. AccuWeather claim…
for people who live in europe, try AROME, it's very limited compared to the other models, but it does (IMO) give the best forecast. in my experience AROME tends to forecast on the drier side of the weather. Since I'm in the UK I use AROME first and flick between ECMWF. (ECMWF tends to forecast on the wetter side!!) for the next hour(s) forcast, I tend to use rain radar - windy has this, but it's not the best I use ne…
Their utility depends a bit on what is causing the uncertainty in the forecast though. For the mid-latitutdes, a lot of the uncertainty comes from timing the arrival of a weather system. In these cases, the high resolution simulation doesn't help you, as it just incorporates the uncertainties of the lower resolution driving model.
The ensemble simulations that the weather servies perform will help you there, ECMWF has a really nice meteogram for individual locations [2].
[0] - https://www.dwd.de/EN/ourservices/nwp_forecast_data/nwp_fore...
[1] - https://www.metoffice.gov.uk/research/approach/modelling-sys...
[2] - https://apps.ecmwf.int/webapps/opencharts/products/openchart...
https://earth.nullschool.net/
Off topic: I am interested in off-shore solar resources. Are there raw historic datasets or nice visualization for solar irradiation including over seas and oceans ?
For visualizing gridded data products you can use panoply[3]. If you just care about GRIBS zyGrib works pretty well too.
[1]https://www.ecmwf.int/en/forecasts/datasets/reanalysis-datas... [2]https://www.ready.noaa.gov/archives.php [3]https://www.giss.nasa.gov/tools/panoply/
I have been using the similar site https://www.ventusky.com for a few years now.
There's also https://www.predictwind.com/ which is a (very expensive) commercial service a lot of boat/yacht folks use for planning. I believe they also have some utilities for delivering compressed forecast data over satellite link as well.
This stuff really only applies to offshore or other low bandwidth connection use cases. When I have decent cell/internet it’s hard to beat windy’s UI.
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Thanks for the reply. It sounds like you have a much better grasp of these things than I do. So, when clients like windy forecast "10 knots east gusting to 20" for ECMWF, do you know if those numbers are directly copied and pasted from the ECMWF model, or do clients take the probabilistic forecast model and make some sort of average prediction that they display? I'm very interested in how clients like windy go from a…
GFS takes a simple average of the ensembles for their avg model, I believe. The biggest problem is that you can't use statistics like you normally would in meteorology. Predictions are actually very good for knowing WHAT happens to a weather system, but not WHERE it happens. I work in the sailing space, so this is what happens there: A racing offshore sailor would consider a variety of models and ensembles. Then they…
A lot of private providers roll up different agencies models to provide their own proper ie tart weather model because this is a lot cheaper than running the HPC required for most deterministic models.
The most important thing when checking the weather, especially with apps like windy, is to compare multiple models for your self to see how “stable” the forecasts are that day.
This is also a PWA that you can add to your home screen in iOS for a nice full screen view.
On an ipad the app is a usability disaster. On android the app is ok but the web version has the new features first anyway
What is the problem with PWA mode on the iPad?
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They're using Mapy.cz. Same location in Mapy.cz and Google Maps: https://mapy.cz/turisticka?x=14.1857611&y=49.9310438&z=14 https://www.google.com/maps/@49.931472,14.185431,14z
So pardon my ignorance in all things GIS, but it looks like Mapy.cz serves the tiles which are based on OpenStreetMap. On that Mapy.cz site, there is no style that is similar to Windy. The maps I see are "Basic", "Traffic", "Outdoor", etc. I'm interested in the grey/outlines basemap like this: https://www.windy.com/-Weather-radar-radar?radar,50.310,1.15... . The shading around the coastlines in particular is exquisit…
The gray map is probably custom made by Windy.