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!

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.

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

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

@fx-eddh said in Windy offers Sounding Forecast:

Stüve to Skew t-log p

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

@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.

@btschumy Hi, the whole composite is created from multiple images from multiple satellites. This is boundary of two satellite images (from Goes West and Goes East). Infra composite is almost perfect, but visible composite suffers many problems especially due to reflections and refractions of the light. We will focus on this in future, but unfortunately some of these visual artifacts can not be completely removed.

According to ECMWF and GFS models it seems that Typhoons Soulik and Cimaron will simultaneously make landfall in highly populated areas in the following days. The first one in Korea, the second one in Japan.

Typhoon Soulik is already in range of local radars:

@tobiasv @idefix37
Dear Tobias, you are right that our station is offline, we are investigating why it is so.
It will be operational soon.
As regards the data access: We were waiting for the Blitzortung station for a really long time, more than a year.
When we received one and installed it, we had already developed most of the system to display lightnings. We were disappointed when we found out that we can not use real time data in any way and that only Blitzortung or Lighntingmaps are allowed to use it.
We were contributors of Blitzortung and felt like we have right to use the data.
But it seems that Blitzortung data is no real open data as we had expected.
I admit that it is your business, since you have ads on your page, and under such conditions we are willing to make a deal with you, to buy the data via some API or whatever.
Yes, we are non-profitable so far, but we also have a budget and can pay you for the data access.
Many people all around the world want to see real-time lightnings on Windy,
but if you keep your attitude in a style that there is no chance to get your agreement, we will of course stop using Blitzortung data and must find some other solution. :-(

Visual glitches disappeared, data seems correct again.

US satellite data from Goes 16 and 17, acquired via Google Cloud is corrupted. We are investigating the problem further. Possible solution is to change the data provider/storage.

@Gkikas-LGPZ Hi, thank you for reporting, it seems like a bug. Most likely it is because isolines are calculated from images with smaller resolution. We should improve this.

@Bbary Prosím buďte trpělivý a počkejte si na oficiální release. Až to bude, tak to oznámíme. Ve webové verzi by to mělo ode dneška fungovat. Zatím pouze v Evropě. Postupně budeme nasazovat dále. Pokud jsme psali, že to bude za měsíc nebo dva, tak to byl pouze odhad. Žádné oficiální datum zatím není. Snažíme se to vydat co nejdříve, ale je to postupný proces.

@Bbary Je fajn, ze mame takoveho horliveho priznivce. Uz je to nasazeno. Pokud nebudou zadne problemy, kvuli kterym bychom to museli stahnout, tak poznate zmenu teprve az bude aktivni 06 reftime, coz by melo byt kolem 15:00 SELC. Ted to moc nepoznate, protoze je aktivni pulnocni beh modelu.

@Bbary Dobrý den, až začne škola nebo možná i o chvilku dříve ;-)

Air quality layers CO and Dust are not being updated due to server outage of the data provider.

Solved 2020-07-24 15:00 UTC

@jfreidin @sweedishfish @reptiletim We are sorry for the data outage. It is fixed now. All US radars should be restored in few minutes.

@MysticWay @rogerdunning We are sorry for the data outage. It is fixed now. All US radars should be restored in few minutes.