Geostationary Ring Convection RGB - Multimission

This visualization is composed of a 3-hourly imagery of RGB Convection products from different geostationary satellites: Meteosat 0 Degree and Meteosat IODC, GOES-16 and GOES-17, Himawari-8. Every single imagery composing the final product, is generated by assigning red, green and blue to imageries based upon brightness temperature difference (BDT) between the two water vapour channels, infrared and visible solar channels data from the following instruments: - SEVIRI (Meteosat): WV6.2, WV7.3, IR3.9, IR10.8, NIR1.6, VIS0.6 channels. - ABI (GOES-16 and GOES-17): WV6.2, WV7.3, IR3.9, IR10.3, NIR1.6, VIS0.64 channels. - AHI (Himawari-8): WV6.2, WV7.3, IR3.9, IR10.4, NIR1.6, VIS0.64 channels. This product is useful to emphasize convection with strong updrafts and small ice particles indicative of severe storms and helps in identifying the early stage of strong convection. Severe convective storms appear bright yellow in this colour scheme because of the near zero BTD WV6.2-WV7.3 of overshooting Cb clouds. The strong updrafts in these clouds produce small ice particles at cloud tops due to homogeneous freezing of cloud drops, resulting with large BTD IR3.9-IR10.8 (green). Finally, large negative values of NIR1.6-VIS0.6 because of the large absorption at NIR1.6 by ice particles keeps the blue very low. Please note that small ice crystals of Cirrus clouds should not be confused with vigorous convection. Inferred small ice crystals that are not associated with anvils of Cb clouds must form by elevated strong updrafts, such as in high altitude orographic wave clouds. Product is limited to daytime utility, high Sun zenith and high satellite scanning angles.