Cloud physics vertically developed clouds, the cumulonimbus type is the tallest and can virtually span the entire troposphere from a few hundred metres above the ground up to the tropopause. It is the cloud responsible for thunderstorms. Some cirriform clouds can form at very high to extreme levels above the troposphere, mostly above the polar regions of Earth. Polar stratospheric clouds clouds are seen but rarely in winter at altitudes of 18 to 30 kilometers, while in summer, noctilucent clouds occasionally form at high latitudes at an altitude range of 76 to 85 kilometers. Homospheric types determined by cross-classification of forms and
UK Government G-Cloud COO of GDS, took over as director of G-Cloud. A new version of the G-Cloud framework is normally released about every 6 to 9 months. G-Cloud version 9 went live in May 2017; as of November 2017, the release date for version 10 had not been finalised. G-Cloud had several calls for contract to establish framework agreements. Major US vendors Amazon Web Services (AWS) and Google were initially excluded by the UK government in 2012 (G-Cloud 3) but AWS has since been added in 2013 (G-Cloud 4). Following hints by the head of the programme, GDS chief operating officer Tony