Samsung NX 500 & Samyang 8mm F2.8 UMC Fisheye II, interval 5 seconds, speed 150x
20260402_1005-1200utc_Kacerov_x264_1800x1080.mp4 (100 MB)
Wave of altocumulus clouds above Prague.
See also comparison of this image from the Sentinel-2B satellite (Highlight Optimized Natural Color image, with native pixel size of the used MSI bands 10m, showing location from which the timelapse was captured, and its angle of view) and a ground-level shot from the timelapse series, both taken at the same time (10:16:50 UTC). Thanks to the high resolution of the MSI instrument, individual altocumulus clouds are clearly visible in the image it captured. Though, despite the fact that both images were taken at the same time, it is impossible to co-locate the individual altocumulus clouds in these. For comparison, attached are images from the FCI instrument on the Meteosat-12 satellite (MTG-I1) from the same time: RGB True Color, RGB Cloud Type (CHMI), RGB Cloud Phase (CHMI), RGB VIS-IR and VIS 0.6. The cloud wave is visible in all of these, but without any structure within it (the resolution of these images is 0.5 and 1 km). Animations of the RGB True Color and RGB Cloud Type (CHMI) images show significant temporal variability of the wave, which corresponds to the development seen in the time-lapse. Small red cross in MTG images shows the location from where the timelapse was taken (Praha - Kačerov, Czechia).