Question: Why reported wind speed of hurricane is much higher than value forecasted by Windy?

Answer: Windy displays ECMWF or GFS global forecast model. Neither of them is capable to predict exact peak values.

Reasons:

1. Modeling: Numerical model computes grid that has finite resolution in both space and time (~10km in space horizontally, ~100-1000m vertically, ~1-6h in time). Peak values are smoothed, because of coarse grid resolution.
2. Analysis of input data: Calculations are based on measurements. They come from stations, radars, satellites and other sensors. These sensors are not always reliable, so extremal measurements can be considered as errors during data assimilation and thrown away to avoid damaging the computation.

Conclusions:

1. Numerical models are not good at prediction of local extreme values and phenomena. Examples: tornadoes, convective storms, hails, single convective clouds, single orographic clouds, extreme wind speed in storms or hurricanes.
2. Numerical models are good at prediction of averege and "smooth" values. Examples: average wind in last 3 hours, temperature, humidity, pressure field.

Altitude and coverage of convective clouds (cumuli) ...I will implement it one day :-) but if there are more people wanting this, please upvote!

@triggernometry @auweatherwatcher @emilyyyZzz They are girls and we call them so. We use such naming in common language. We do not have anonymous helpdesk, but we have Kori and Petra ...and unlike Alexa or Siri, they are real ;-)

This topic seems to be explosive. I understand that many people are against
"global warming religion", but think about it pragmatically.
If we call "Warming" the situation when "climate is changing rapidly and it is caused by mankind",
then there are 4 options:

A. Warming is not true and we believe it is not true
B. Warming is not true and we believe it is true
C. Warming is true and we believe it is true
D. Warming is true and we do not believe it is true

If we want to do any action we should behave pragmatically, economically, rationally.
Consider the damage control. There are 2 faults among these options: B. and D.
If B. is our reality we may waste our energy and money uselessly and our children will laugh at us in future.
If D. is our case, it means that we are borrowing our wealth from future generation, our children will hate us.
From this point of view the "panic" about Warming is completely understandable.

If we think about what is caused by humans: Daily weather is caused by humans. If you live in big city,
the temperature, moisture, evaporation, albedo, everything is massively influenced by human and you can measure it.
If you look at countryside from air, you can see that the terrain is completely changed by human. It also affects daily weather.
People have power to change the landscape, to destroy or plant whole forests.
Greenhouse hypothesis is about composition of atmosphere. I do not want to judge whether that hypothesis is true
or false. But people are moving fossil fuel from land to atmosphere. That is fact. One day all fossil fuel
will be moved from land to atmosphere, it will not magically disappear.
50000kg of airliners fuel means exactly 50000kg of waste. It is taken from land and put to air circulation.

Rising temperature is reality. Question is: Is it caused by our technical revolution? Nobody is sure, but there is correlation.
Do not cry, do not panic, just think about A, B, C, D.

@MolnAir Hi, we are sorry, this was a fault on our server, not a problem on ECMWF side. We had difficulties with data importing, so there remained the old forecast. Everything is up and running now.
On Premium subscriptions: we are trying to find a balance between keeping most of the features free and giving good added value to premium users. A year ago there were just donations (no added value for our contributors). This year we came up with better temporal resolution of the forecasts and it is likely that we will be adding more premium features or maybe shifting some existing features to premium to keep the product attractive for our subscribers. We are developing Windy for people and we are happy that a part of them (like you) is willing to pay for it. Thank you!

@meteo-GR Now it is accessible through the testing interface only, but is scheduled for release during this week.

@Alvarnegro Hi! Yes we are planning to add such features. Are you a paraglider?

@fx-eddh said in Windy offers Sounding Forecast:

Stüve to Skew t-log p

Yes, we are considering switching between these "coordinate systems".

Hi Jeff,
thank you for the feedback. It is not possible now.
Maybe we will consider this in some future release.

@p1rate Hi! Symbols illustrate wind speed and direction.
See this picture: https://en.wikipedia.org/wiki/Weather_map#/media/File:Wind_barbs.gif
How can this help you to prepare flight? It depends on what kind of flying you do (thermal flying / ridge flying) and on the terrain where you want to fly.

@gvulpiani the range has been fixed.

@gvulpiani Hi, thank you, it seems you are right. We will fix it.

Hi, we adjusted the values of ECMWF freezing level so it is also AMSL now.

Hi, thank you for reminding this, I am putting the issue on the "top of our stack".

We have no radar data for Japan from our provider. We expect to renew the data access in a few days.

22.3.2021
Japan radar has been restored.

@giulianomerlo You can check prediction of spreading of the cloud here: https://www.windy.com/-SO2-tcso2?tcso2,2021031219,38.839,18.128,6
...Forecast of SO2 column from Copernicus Atmosphere Monitoring Service.

@askhat_1tv Windy does not provide data. You can download GRIB files of GFS here: https://nomads.ncep.noaa.gov
ICON grib files can be downloaded here: https://opendata.dwd.de/weather/nwp/icon/grib

I hope it helps.
TZ

Hi, unfortunately we are not providing data. If you want some GRIB files, look for GFS or ICON models. They are freely available.

@wellistrilight Hi, we are working on it. I hope that fixes will be finished in thw following two days.

@akwx @Korina Hi, we investigated it again and it is definitely a bug. Thank you for reporting.