The satellite images are usually updated every 15 mnutes.
The top image is a visible image,
Which is the actual view from space, during hours of darkness it will of course be black.
The lower image is an Infrared image, with the coldest areas being the whitest, and warmer being black, the thicker and taller the clouds, the whiter they appear.
If you click on either image it will take you to the Sat24 web site, where there are a lot more visible images for the countries around Europe.
(link opens in a new window)