Jun 29 - Jul 5, 2026
3.5%
Global attention share
13 developing stories, 978.2K searches across 18 regions
Major events are added as they surface and kept for the full week. Existing stories are updated as new facts, questions, and search patterns develop.
The week's developing stories
Keep track of high-interest global stories related to weather happening this week.
Added Jul 4, 2026Image via 朝日新聞
Nacreous clouds, also known as polar stratospheric clouds, are a rare type of cloud that form in the stratosphere at altitudes of 15 to 25 kilometers, typically in polar regions during winter. They are called 'mother of pearl' clouds due to their iridescent colors. These clouds play a crucial role in ozone depletion chemistry and represent unique atmospheric phenomena studied by meteorologists and scientists for their visual beauty and their impact on atmospheric chemistry and climate.
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