Wttr.in: Wrong weather data for Lyon (France)
Hello,
Weather forecast for Thursday 27 of April sounds really off for the city of Lyon, France.
➜ ~ curl http://wttr.in/Lyon
Weather report: Lyon, France
_`/"".-. Rain, Rain Shower
,\_( ). 10-11 °C
/(___(__) ↖ 9 km/h
‘ ‘ ‘ ‘ 6 km
‘ ‘ ‘ ‘ 0.7 mm
┌─────────────┐
┌──────────────────────────────┬───────────────────────┤ Tue 25 Apr ├───────────────────────┬──────────────────────────────┐
│ Morning │ Noon └──────┬──────┘ Evening │ Night │
├──────────────────────────────┼──────────────────────────────┼──────────────────────────────┼──────────────────────────────┤
│ _`/"".-. Light rain sho…│ _`/"".-. Light rain sho…│ .-. Patchy light r…│ .-. Light rain │
│ ,\_( ). 13-14 °C │ ,\_( ). 14-15 °C │ ( ). 14 °C │ ( ). 11-12 °C │
│ /(___(__) ↑ 18-22 km/h │ /(___(__) ↑ 15 km/h │ (___(__) ↘ 15-21 km/h │ (___(__) ↘ 18-26 km/h │
│ ‘ ‘ ‘ ‘ 19 km │ ‘ ‘ ‘ ‘ 17 km │ ‘ ‘ ‘ ‘ 13 km │ ‘ ‘ ‘ ‘ 11 km │
│ ‘ ‘ ‘ ‘ 0.8 mm | 61% │ ‘ ‘ ‘ ‘ 0.8 mm | 89% │ ‘ ‘ ‘ ‘ 3.0 mm | 100% │ ‘ ‘ ‘ ‘ 2.0 mm | 100% │
└──────────────────────────────┴──────────────────────────────┴──────────────────────────────┴──────────────────────────────┘
┌─────────────┐
┌──────────────────────────────┬───────────────────────┤ Wed 26 Apr ├───────────────────────┬──────────────────────────────┐
│ Morning │ Noon └──────┬──────┘ Evening │ Night │
├──────────────────────────────┼──────────────────────────────┼──────────────────────────────┼──────────────────────────────┤
│ _`/"".-. Patchy rain po…│ \ / Partly cloudy │ _`/"".-. Light rain sho…│ _`/"".-. Patchy rain po…│
│ ,\_( ). 4-6 °C │ _ /"".-. 7 °C │ ,\_( ). 11 °C │ ,\_( ). 8 °C │
│ /(___(__) ↘ 10-21 km/h │ \_( ). ↓ 16-23 km/h │ /(___(__) ↘ 16-23 km/h │ /(___(__) ↘ 12-21 km/h │
│ ‘ ‘ ‘ ‘ 16 km │ /(___(__) 16 km │ ‘ ‘ ‘ ‘ 15 km │ ‘ ‘ ‘ ‘ 14 km │
│ ‘ ‘ ‘ ‘ 0.0 mm | 21% │ 0.1 mm | 68% │ ‘ ‘ ‘ ‘ 0.2 mm | 83% │ ‘ ‘ ‘ ‘ 0.1 mm | 47% │
└──────────────────────────────┴──────────────────────────────┴──────────────────────────────┴──────────────────────────────┘
┌─────────────┐
┌──────────────────────────────┬───────────────────────┤ Thu 27 Apr ├───────────────────────┬──────────────────────────────┐
│ Morning │ Noon └──────┬──────┘ Evening │ Night │
├──────────────────────────────┼──────────────────────────────┼──────────────────────────────┼──────────────────────────────┤
│ _`/"".-. Light sleet sh…│ .-. Heavy snow │ _`/"".-. Light rain sho…│ _`/"".-. Patchy rain po…│
│ ,\_( ). 4-6 °C │ ( ). 10 °C │ ,\_( ). 11-12 °C │ ,\_( ). 7-8 °C │
│ /(___(__) ↘ 20 km/h │ (___(__) ↘ 22-24 km/h │ /(___(__) ↘ 21-26 km/h │ /(___(__) ↘ 14-24 km/h │
│ ‘ * ‘ * 18 km │ * * * * 16 km │ ‘ ‘ ‘ ‘ 14 km │ ‘ ‘ ‘ ‘ 15 km │
│ * ‘ * ‘ 1.8 mm | 32% │ * * * * 1.2 mm | 81% │ ‘ ‘ ‘ ‘ 0.6 mm | 89% │ ‘ ‘ ‘ ‘ 0.2 mm | 83% │
└──────────────────────────────┴──────────────────────────────┴──────────────────────────────┴──────────────────────────────┘
You can see snow prediction for this particular day while it's spring there and weather is getting mild, with temperature records usually above 10 - 15°C at noon.
Local and other popular weather forecast services show no such thing. For instance, the french weather forecast agency shows this : http://www.meteofrance.com/previsions-meteo-france/lyon/69000 (click on 'jeudi 27').
xlucas
All 12 comments
@xlucas: Hi, Lucas!
Thank you for reporting this, but I must note that there were no snow predictions:
(that is the same in French)
Prévisions météo pour: Lyon, France
_`/"".-. Averse de pluie modérée
,\_( ). 9-11 °C
/(___(__) ↑ 13 km/h
‚‘‚‘‚‘‚‘ 8 km
‚’‚’‚’‚’ 0.7 mm
┌─────────────┐
┌──────────────────────────────┬───────────────────────┤mar. 25 avril├───────────────────────┬──────────────────────────────┐
│ Matin │ Après-midi └──────┬──────┘ Soir │ Nuit │
├──────────────────────────────┼──────────────────────────────┼──────────────────────────────┼──────────────────────────────┤
│ _`/"".-. Averse de plui…│ _`/"".-. Averse de plui…│ .-. Pluie légère é…│ .-. Pluie légère │
│ ,\_( ). 13-14 °C │ ,\_( ). 14-15 °C │ ( ). 14 °C │ ( ). 11-12 °C │
│ /(___(__) ↑ 18-22 km/h │ /(___(__) ↑ 15 km/h │ (___(__) ↘ 15-21 km/h │ (___(__) ↘ 18-26 km/h │
│ ‘ ‘ ‘ ‘ 19 km │ ‘ ‘ ‘ ‘ 17 km │ ‘ ‘ ‘ ‘ 13 km │ ‘ ‘ ‘ ‘ 11 km │
│ ‘ ‘ ‘ ‘ 0.8 mm | 61% │ ‘ ‘ ‘ ‘ 0.8 mm | 89% │ ‘ ‘ ‘ ‘ 3.0 mm | 100% │ ‘ ‘ ‘ ‘ 2.0 mm | 100% │
└──────────────────────────────┴──────────────────────────────┴──────────────────────────────┴──────────────────────────────┘
┌─────────────┐
┌──────────────────────────────┬───────────────────────┤mer. 26 avril├───────────────────────┬──────────────────────────────┐
│ Matin │ Après-midi └──────┬──────┘ Soir │ Nuit │
├──────────────────────────────┼──────────────────────────────┼──────────────────────────────┼──────────────────────────────┤
│ _`/"".-. Pluie éparse à │ \ / Partiellement …│ _`/"".-. Averse de plui…│ _`/"".-. Pluie éparse à │
│ ,\_( ). 4-6 °C │ _ /"".-. 7 °C │ ,\_( ). 11 °C │ ,\_( ). 8 °C │
│ /(___(__) ↘ 10-21 km/h │ \_( ). ↓ 16-23 km/h │ /(___(__) ↘ 16-23 km/h │ /(___(__) ↘ 12-21 km/h │
│ ‘ ‘ ‘ ‘ 16 km │ /(___(__) 16 km │ ‘ ‘ ‘ ‘ 15 km │ ‘ ‘ ‘ ‘ 14 km │
│ ‘ ‘ ‘ ‘ 0.0 mm | 21% │ 0.1 mm | 68% │ ‘ ‘ ‘ ‘ 0.2 mm | 83% │ ‘ ‘ ‘ ‘ 0.1 mm | 47% │
└──────────────────────────────┴──────────────────────────────┴──────────────────────────────┴──────────────────────────────┘
┌─────────────┐
┌──────────────────────────────┬───────────────────────┤jeu. 27 avril├───────────────────────┬──────────────────────────────┐
│ Matin │ Après-midi └──────┬──────┘ Soir │ Nuit │
├──────────────────────────────┼──────────────────────────────┼──────────────────────────────┼──────────────────────────────┤
│ _`/"".-. Légères averse…│ .-. Neige forte │ _`/"".-. Averse de plui…│ _`/"".-. Pluie éparse à │
│ ,\_( ). 4-6 °C │ ( ). 10 °C │ ,\_( ). 11-12 °C │ ,\_( ). 7-8 °C │
│ /(___(__) ↘ 20 km/h │ (___(__) ↘ 22-24 km/h │ /(___(__) ↘ 21-26 km/h │ /(___(__) ↘ 14-24 km/h │
│ ‘ * ‘ * 18 km │ * * * * 16 km │ ‘ ‘ ‘ ‘ 14 km │ ‘ ‘ ‘ ‘ 15 km │
│ * ‘ * ‘ 1.8 mm | 32% │ * * * * 1.2 mm | 81% │ ‘ ‘ ‘ ‘ 0.6 mm | 89% │ ‘ ‘ ‘ ‘ 0.2 mm | 83% │
└──────────────────────────────┴──────────────────────────────┴──────────────────────────────┴──────────────────────────────┘
(if you mean 25 apr). It was shower prediction, not snow prediction.
If you mean 27 apr, there is snow indeed, but why are you sure that it is impossible?
We had snow in Munich two days ago, why it's not possible that it comes again?
And look at this photo:
https://pbs.twimg.com/media/C-CPAjTXYAAC6L9.jpg
This photo I received from one of wttr.in users.
The city on the photo has almost the same latitude as Lyon.
chubin
on 25 Apr 2017
Hello @chubin
I'm referring to the 27th of April, as mentioned in the beginning of my post.
It sounds really impossible for this time of year, given predicted temperatures for that day and current temperatures, and their evolution for the past few weeks. It could be rain but not snow.
The French weather forecast agency detailed predictions is 0% snow probability and 0% frost probability for the whole week. Basically looks like this other weather forecast service : http://www.accuweather.com/en/en/lyon/171210/hourly-weather-forecast/171210?hour=57.
Also there's no snow predicted anywhere else in the surrounding countryside nor in the whole country for the local weather forecast service at noon.
I can send you a picture on thursday :)
xlucas
on 25 Apr 2017
Check this forecast for example:
https://www.worldweatheronline.com/v2/weather.aspx?q=Lyon,%20France
Open Thursday, afternoon
As you can see, in this forecast you also have snow
chubin
on 25 Apr 2017
Yes, but you are right. Our datasource is sometimes really inaccurate. I think the best solution would be to have several datasources and let users choose from
chubin
on 25 Apr 2017
That would be nice !
xlucas
on 25 Apr 2017
so how about accessing different countries' official weather services? At least the German weather service offers free FTP access and I'm sure others do that as well. Using a local weather service should give more accurate predictions, right?
the-n3i
on 8 May 2017
@the-n3i It's a good question. I don't know if a local weather service gives more accurate predictions, but it is at least a good idea to have different data sources and combine them (or give a user ability to chose from). What German local weather services are you talking about?
chubin
on 8 May 2017
I'm talking about "DWD" (Deutscher Wetterdienst, literally "German Weather Service"). It's a state-run service and therefore has to give access to its data under a relatively free license.
Information about DWD in English can be found here.
Info about FTP Access to their data and the restrictions can be found here.
the-n3i
on 8 May 2017
@the-n3i Das ist echt interessant. Ich werde mir das mal genauer ansehen. Vielen Dank für den Hinweis. Ich wusste gar nicht, dass die DWD Daten frei zu Verfügung gestellt werden.
(I better switch back to English because of other users who could read this issue later).
Thank you very much for the link. I'll check the format of the data, and how often they are actualized and other things like that.
chubin
on 8 May 2017
see also #9
chubin
on 3 Sep 2017
All the issues related to inaccurate forecasts are duplicates of issue #9, isn't it?
pabloab
on 28 Sep 2020
@pabloab Maybe yes, or maybe not. This also can be caused by #523 or #526
chubin
on 29 Sep 2020
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so how about accessing different countries' official weather services? At least the German weather service offers free FTP access and I'm sure others do that as well. Using a local weather service should give more accurate predictions, right?