You can see the source IR image (which incorporates GOES data) here: https://navigator.eumetsat.int/product/EO:EUM:DAT:0330

It took quite a while to work out how to process it to get a level of realism I was happy with. IR is tricky because the same level of grey could either be warm cloud or cold land, so just discarding anything below a certain level to try and get rid of the land also loses a lot of cloud detail. I've combined that IR map with another false-colour image which lets me recover some of that detail, then I'm also extracting clouds from a true-colour image which restores more detail for areas in daylight.