If you look your data for Saturday the 13th of August, you see 0.4mm at 5.00AM. This is the total of rain accumulation between 2.00AM and 5.00AM. Then you see 0.9mm at 8.00AM. This is the total of rain between 5.00AM and 8.00AM.
If you go for Windy Premium, by splitting from 3h forecast to 1h forecast, you will see how the rain fall is spread by 1h in place of seeing the accumulation over 3h : for instance, you could have 0.2mm at 4.00AM and 0.2mm at 5.00AM as a potential example
@idefix37 Sure, I take your point, I don't want to be throwing the baby out with the bath water. I'm generally thinking about non-orographically induced convective precipitation when I talk about the merits of extrapolation. But do bear in mind – models can be pretty bad when it comes to orographically induced convection.
Frontal precipitation is a very different story however, and I would most certainly agree that a high-resolution model will beat extrapolation in a frontal situation over complex terrain even at short lead times. I'm not sure what the Swiss approach specifically is, so I won't comment on that.
With convective showers though, the terrain won't matter as much. The triggering is a bit less random, sure, since the model will understand the thermal properties of the orography to some extent. But terrain induced resolved convection still has a ways to go, especially because of a problem known the "grey zone", which is emerging in sub-kilometre resolution limited-area models.
All the same, if anyone knows their way around complex-terrain NWP, it's the Swiss :)
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The best way to change the prediction in 1 hour increments is the hold your smartphone in one hand and to move the time slider with your thumb, you get a better control. But this is not possible with a tablet.
I think that Windy try to reduce the number of buttons to give more free space to the map on a small phone screen. With your proposal it would need to add 9 buttons more.