HRRR with a write-in for ICON

I'm not totally sure what that arrow is supposed to represent but I don't think it is the direction you are facing. For me it always points north and doesn't change. I suspected it was the direction you are moving in (useful for storm chasers) but it also doesn't seem to change as I move in a particular direction.

Do you see a small “particles animation” switch in the bottom right of the chart? That needs to be turned on.

You can also just click or tap anywhere on the map and an onscreen indicator is displayed showing the parameter value at that location.

I would appreciate it if someone on the Windy team could respond to this post. I would like to understand how total cloud coverage is calculated.

Thanks,
Bill

Thanks for the additional info. Possibly I’m starting to understand the issue. When viewing the map while zoomed out, is the grib file sent to the app at a lower resolution? If the grib file’s resolution varies with the map zoom level then I can totally see how the interpolation between points can change with zoom.

To be clear, the Hurricane Tracker is available in the iOS app when running on an iPad. It must just be on a phone where it is not shown.

Thanks, I just read though the other reports of it.

If this is not a bug, it is at least a suboptimal design. Surely you would not want this to happen if it could be avoided. I never know what the actual value is and thus cannot fully trust the map reading other than to give a sort of estimate.

It does sound like it is due to some sort of averaging over an area. I guess the point value for that location is not readily available.

I will also say in Windy's defense that in practice it probably doesn't make any difference. Surely the error bars on most of the forecasted values are as large or larger than the variability while zooming. It just offends my engineering sense of precision.

I've noticed that the forecasted values displayed on the maps will change as you zoom in or out. For temperature it may only be a couple of degrees. However, for cloud coverage, it can change by 10% (coverage) or more.

What is happening here? The only thing I can think of is that the app is sampling a region around the location and as you zoom in and out the region size changes.

I addition, when you change the zoom level, the value is initially way off and then after a second our two it corrects itself to the value that changes somewhat with the zoom level.

Two people have previously reported this issue with iOS 10.3.4. What version of iOS are you running?