<![CDATA[Écart considérable entre prévision par 3 h ou par 1 h]]>Je consulte sur mon iPad le temps Arôme pour Nantes mardi prochain. Pour la version 3 h, il n'y a pas de pluie, pour la version par h, il y a 15 mm d'eau entre 9 et 15 h ?
Pourquoi, même si l'écran affiche ECMWF pour cette échéance !
Idem en passant par chrome.![text alternatif](![1_1648802000139_14BAA2A9-0259-4FB7-B160-E2542B592EFF.png](Envoi en cours 0%) ![0_1648802000139_03813DB0-DFE4-4E32-BE3E-F6790C08A10A.png](Envoi en cours 0%) url de l'image)

]]>https://community.windy.com/topic/19979/écart-considérable-entre-prévision-par-3-h-ou-par-1-hRSS for NodeTue, 17 Mar 2026 12:39:26 GMTFri, 01 Apr 2022 08:33:43 GMT60<![CDATA[Reply to Écart considérable entre prévision par 3 h ou par 1 h on Wed, 27 Apr 2022 10:59:43 GMT]]>Hi all,
this bug has been fixed.

Tomas

]]>https://community.windy.com/post/105632https://community.windy.com/post/105632Wed, 27 Apr 2022 10:59:43 GMT<![CDATA[Reply to Écart considérable entre prévision par 3 h ou par 1 h on Fri, 08 Apr 2022 13:01:48 GMT]]>@filip_k
@jylera
Thanks for investigation.

]]>https://community.windy.com/post/104041https://community.windy.com/post/104041Fri, 08 Apr 2022 13:01:48 GMT<![CDATA[Reply to Écart considérable entre prévision par 3 h ou par 1 h on Fri, 08 Apr 2022 12:50:15 GMT]]>@idefix37 There is something seriously wrong with merging AROME and ECMWF. Notice that after 5 days (that's when forecast step of ECMWF changes from 1h to 3h) forecast goes haywire. It is more visible with 1h forecast, but 3h forecast is wrong too. Multiple days (notice temperature going up and down - "red hills") get mashed up into one. We will investigate and fix this, thank you for the report.

3-hour step
ecmwf_vs_arome_3h.jpg
1-hour step
ecmwf_vs_arome_1h.jpg

]]>https://community.windy.com/post/104040https://community.windy.com/post/104040Fri, 08 Apr 2022 12:50:15 GMT<![CDATA[Reply to Écart considérable entre prévision par 3 h ou par 1 h on Fri, 08 Apr 2022 12:35:17 GMT]]>@idefix37 Hello, we did have a closer look and there is certainly something wrong with the AROME forecast. We will fix it, thank you for report!

]]>https://community.windy.com/post/104035https://community.windy.com/post/104035Fri, 08 Apr 2022 12:35:17 GMT<![CDATA[Reply to Écart considérable entre prévision par 3 h ou par 1 h on Wed, 06 Apr 2022 06:47:22 GMT]]>@jylera

You show screenshots from April 1rst. So it is not easy to analyse them now again.
So I have made the same exercise at the end of this week. Between Saturday and Sunday there are similar problems.

ECMWF for Saturday and Sunday does not predict any rain. With 1h setting the time step after 5 days is 3h.

397D0120-7732-4E3B-8BCE-8FCBAE517FB7.jpeg

With AROME and 1h setting, rain is predicted and time step after 5 days is still 1h !

CD4111C7-2423-4855-B5F0-E0A245DD721B.jpeg

But with AROME and 3h setting, there is no rain and time steps are 3h after 5 days.

4F847922-111B-4968-838A-B7CDD92E3D46.jpeg

@Korina So there is something wrong with AROME setting and 1h setting after 5 days.

These screenshots are from the iPad app.

]]>https://community.windy.com/post/103737https://community.windy.com/post/103737Wed, 06 Apr 2022 06:47:22 GMT<![CDATA[Reply to Écart considérable entre prévision par 3 h ou par 1 h on Tue, 05 Apr 2022 16:09:21 GMT]]>@jylera 1A53C8DB-5112-4023-8045-34738E85EB91.jpeg

]]>https://community.windy.com/post/103735https://community.windy.com/post/103735Tue, 05 Apr 2022 16:09:21 GMT<![CDATA[Reply to Écart considérable entre prévision par 3 h ou par 1 h on Tue, 05 Apr 2022 16:07:18 GMT]]>@korina voici les copies d'écran iPad 679F527C-4DDE-4FEE-8301-31F53C89ED0B.jpeg

]]>https://community.windy.com/post/103734https://community.windy.com/post/103734Tue, 05 Apr 2022 16:07:18 GMT<![CDATA[Reply to Écart considérable entre prévision par 3 h ou par 1 h on Fri, 01 Apr 2022 11:24:57 GMT]]>@jylera Hello, please enclose a screenshot. The image has to have a smaller size.

]]>https://community.windy.com/post/103376https://community.windy.com/post/103376Fri, 01 Apr 2022 11:24:57 GMT