Écart considérable entre prévision par 3 h ou par 1 h

[jylera]

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.  url de l'image)

[Korina]

@jylera Hello, please enclose a screenshot. The image has to have a smaller size.

[jylera]

@korina voici les copies d'écran iPad

[jylera]

@jylera

[idefix37]

@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.

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

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

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

These screenshots are from the iPad app.

[Korina]

@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!

[Filip_K]

@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

1-hour step

[idefix37]

@filip_k
@jylera
Thanks for investigation.

[nesro]

Hi all,
this bug has been fixed.

Tomas