This is the maximum zoom level before the Windy web application switches to street maps. I find myself often squinting at this to figure out how my activities relate to predicted cloudcover and temperature gradients. The cropped image probably does not reproduce my subjective experience, because my screen is a high-DPI one. It's even more pronounced when applied against the (wonderful!) HRRR forecast availability, as it has such high resolution.
I have been working around this since, well, forever, by either moving the weather picker around when using the street map (for simple checks) or using the browser font-increase function (when I'm checking forecasts over time or evaluating a more complex interface), at a lower zoom level, but it's been annoying me and I'm not sure of what use street maps are at such a low zoom level.
Blessedly, this frustration is not replicated on mobile, where gradients stay active at much higher zooms.
In a related consideration regarding zoom levels, I do find when I type in the name of a favorite or feature in the Windy search that it loses my zoom level and zooms out way, way too far. Both issues seem to relate to a design with much lower zoom levels in mind.