Wind animation direction different (wrong?) at high zoom levels (sometimes) in Chrome

willrice

Dear Windy team,

I have spotted an unexpected behaviour in Chrome on macOS where the wind animation for a forecast sometimes appears to come from a different (incorrect?) direction at high zoom levels.

Video of the Unexpected Behaviour on Dropbox

Steps to Recreate

Browse to windy.com in Chrome on macOS
In the search bar, type Royston, UK then click on the first result (Royston, East of England)
Click on the forecast timeline to a random point in the future
Zoom in using the scroll wheel - one level at a time. Once you reach the maximum zoom level, zoom back out again one level at a time.
Observe the animated wind direction for discrepancies at different zoom levels. If none are observed, go back to step 3 and repeat...

Expected Behaviour
For any given point on the map, the wind animation is shown from the same direction at every zoom level.

Actual Behaviour
Sometimes the wind direction at higher zoom levels differs significantly (incorrect direction?) from the direction shown at lower zoom levels & in the forecast timeline (correct direction?). The discrepancy in animated direction appears to usually be between the 4th & 5th highest zoom levels.

Test System

Chrome 100.0.4896.75 (Official Build) (x86_6)
macOS 10.14.6 Mojave
Mac Pro 5,1 w/ Radeon RX 580 8 GB & 4k display

petra.pik

Hello @willrice, thank you for reporting this to us, we will look into it.

willrice

Still seeing this bug as originally reported.

I've recently noticed that the incorrect particle animation shown at high zoom levels looks like the particle animation for a much more zoomed out view (higher degree of variation in direction than one would expect for the zoom level)...

Looks like there could be a bug that is causing the browser to render the particle animation overlay for a different tile to the one of the current map view (and a less zoomed in view).