Time-lapse photography of clouds and other phenomena in the sky

My present timelapsing gear consists of full frame Sony A7C camera (with FE 28-60mm F4-5.6, TTArtisan 11mm F2.8 ED Fisheye and Sigma 17 mm f/4 DG DN Contemporary lenses) and APS-C camera Samsung NX500 (with Samyang 12mm F2.0 NCS CS,Samyang 8mm F2.8 UMC Fisheye II and Asahi Takumar SMC 55mm F2 M42 lenses). Comments on why I use these cameras can be found in the Introduction to time-lapse photography page.

All the times below are given in UTC (GMT).

Sources of satellite, radar and other meteorological data used below (unless stated else): CHMI, EUMETSAT and NOAA.

Note: movie files below, which are stored as .mkv (only for selected cases), encrypted here as H.265 RGB) are identical to those stored as .mp4 (here standard H.264 YUV420 encryption), but should have somewhat better quality, namely in fine transitions of the blue sky. However, to play these, you will most likely have to do so outside of your browser, either using a system movie player, or one of the external ones (e.g. MPC-HC or VLC).

Cloud waves above Praha. Determining the height of this and subsequent waves is somewhat uncertain. According to the High Resolution Visible (HRV) channel images from Meteosat-11 (MSG-4, Meteosat Second Generation), the individual waves in the wider area over the Czech Republic seem to cast shadows on a lower, more continuous cloud layer - see this HRV image from the beginning of the timelapse, in which the wave shown in the timelapse is marked with a green arrow, along with the location and angle of the timelapse, and the HRV loop, in which the location of the imaging location is marked with a white cross, and its red color indicates the time of the timelapse. According to lidar observations (source: EUMETNET e-Profile) from nearby Praha-Libuš, the continuous cloud layer is at levels around 1.5 to 2 km - so the waves must be higher above it. The midday (12 UTC) atmospheric sounding (also from Praha-Libuš) indicates a possible additional cloud layer at around 4 km - which might be the level of the waves.