The reference time is the time from which the weather model starts a new run (initialisation, assimilation, computation...). For instance the first reference time for a day is usually 00:00Z which means that all parameters are calculated from that hour. But all the calculation takes time and data are delivered 2 or 3 hours later. This is the update time. In Windy the update time is longer because it includes an additional computational time by Windy to transform the raw data in beautiful weather maps.
So New snow is calculated from 00:00Z
Posts made by idefix37
RE: Difference between Reference time and Update time
RE: The pressure isn't showing when you select a weather station, tried on various weather station same problem also trued on iOS app.
You are right the pressure at the weather station is not shown as figures, only as solid curve compared to the forecast pressure as dotted curve.
RE: New Data
Windy visualizes only weather models data and these models are NOT able to draw fronts. They are drawn usually by meteorologists so there is no solution at the moment to display fronts on Windy.
RE: Direction to north & Rapporteur at wind direction
Do you mean in the weather picker?
Or in the Basic meteogram ?
Windy does not offer past data. For wind you can get the past data from weather stations. Just select Reported wind and click on a weather station to see the wind force and direction few days ago.
RE: Some Vertical isobars don't have when zoomed in? And, not able to upload screenshot of the issue (just 1mb file can't be uploaded? "request entity is too large."? wow.)
Some Vertical isobars don't have when zoomed in?
.... What does it mean?
And, not able to upload screenshot of the issue (just 1mb file can't be uploaded? "request entity is too large."? wow.)
.... So resize your picture
RE: Yearly pro subscription rates.
There is no Pro version for the App of Windy.com This App is free.
You are not on the right forum.
RE: Most accurate way to look at new snow
You are right. But don’t try to make precise calculation, because snowfall and snow depth are just rough estimation made by weather models. The figures are quite inaccurate if you are close to the rain-snow limit and in particular if you consider a location in mountains. The models resolution in mountainous areas it too coarse to give precise snow figures at each altitude levels.
This is the reasons why I asked to Windy developers to forget the decimal precision for Snow depth. 43.8cm is ridiculous and 44cm would be enough precise.
For example this morning the satellite picture over the Alps shows clearly the areas covered by snow:
Compare it with the Snow depth layer from ECMWF ....
RE: Most accurate way to look at new snow
The detail of snowfalls forecast is interesting for knowing the intensity of precipitation. But the cumulation of snowfalls does not give an accurate measure of snow depth because the snow layer compacts by itself. When you select the Snow depth layer the weather picker shows at same time the snow depth and the snow density.
So the Snow depth layer is theoretically more accurate than the total of snowfalls.
RE: North Atlantic storm
A lot of wind and rain...
Make you own forecast with the different models that Windy offer, using the following layers:
Place the weather picker where you live and click on the amber arrow to get the detail Meteogram for your location.
By chance here is a Windy article on the storm expected to hit Iceland tomorrow:
RE: Please let us know more about the climate changing thing
Additionally there are several Articles on Windy which are in connection with global warming and give useful information.
RE: Attention waves in North Atlantik wrong!!
Before posting « Attention waves in North Atlantic is wrong » you should try to understand the difference between Waves, Swells and Wind waves !
If you are sailing in North Atlantic you will observe waves. Their significant height and period correspond to what is called the sea state or the total sea. On Windy this is shown by Waves layer.
Why Swell was almost forecast near 0m? It’s because swell is a wave system generated by a REMOTE wind. In the case of this storm in North Atlantic the waves were only due to the strong LOCAL wind, not to a strong remote wind. You can check it by the Wind waves layer which shows the waves generated by the local wind you observe.
Even if it’s not absolutely exact, you may consider that
Waves (sea state) = Wind waves + Swell
So you may have
14m Waves = 13m Wind waves + 1m Swell
Sailors can use with confidence the Windy maps which are based on 2 of the most reliable global wave models.
RE: Storm: Sabine - Wind Speeds WRONG in Germany Feb 9th 2020
You compare Gusts forecast with Wind forecast. Wind is the averaged wind on 10 minutes.
So first select Gust layer if you want to compare Windy with local weather forecast predicting Gusts. You can check also Wind accumulation which is in fact the field of maximum gusts forecast during a time period, e.g. the next 24h.
Now if you compare the yesterday wind forecasts from 3 models used by Windy with an official weather station near Munich, you see that the differences were quite small (this comparison is only about wind but not gusts)
1st line is the observed averaged wind at weather station
2nd line is the forecast averaged wind
RE: Wuhan Sulfur Dioxide Levels Abnormally High or Just Industry?
Go to Settings -> Customize color scale. This is only available on the website www.windy.com.
You can see that I’ve modified on my side the SO2 color scale and added a step at 400μg/m3 above 80 μg/m3. You may add several steps.
Here is a tutorial to change color scales:
RE: How are air quality pollutants pollutants measured?
Seems that Windy uses NASA data for SO2.
On website press the small clock in right low corner of your screen to get information about all layers.