Clouds shown on Quixel's blog

Can someone please describe how to acquire and the workflow to implement clouds like these shown at the top of Quixel’s recent blog post? Is it just a high-res HDRI and skybox? From where or whom? Thanks.

Bridge 2019.5: All-new UE plugin with 4.24 & Mac support](Bridge 2019.5: All-new UE plugin with 4.24 & Mac support)

That might just be a photo for the website.

You can generate these hdr sky images in Vue software

While we are on the topic of that picture (which is dope !). Is there a tutorial on how to make that scene in particular.

Thanks you,
b