NCAR Science on Twitter: "#FBF In 1999, Carlye Calvin took this spectacular photo of a unique cloud formation fanning out over Boulder… but what is it? Tell us your guess in the
![A winter tree with its branches fanning outward stands with heavy clouds behind it. There is grass in the foreground and hedges beyond Stock Photo - Alamy A winter tree with its branches fanning outward stands with heavy clouds behind it. There is grass in the foreground and hedges beyond Stock Photo - Alamy](https://c8.alamy.com/comp/2ATY8PM/a-winter-tree-with-its-branches-fanning-outward-stands-with-heavy-clouds-behind-it-there-is-grass-in-the-foreground-and-hedges-beyond-2ATY8PM.jpg)
A winter tree with its branches fanning outward stands with heavy clouds behind it. There is grass in the foreground and hedges beyond Stock Photo - Alamy
![Wallpaper sea, the sky, grass, the sun, clouds, trees, house, tropics, stones, shore, island, horizon, the bushes, Kiribati, Tabuaeran, Fanning Island images for desktop, section пейзажи - download Wallpaper sea, the sky, grass, the sun, clouds, trees, house, tropics, stones, shore, island, horizon, the bushes, Kiribati, Tabuaeran, Fanning Island images for desktop, section пейзажи - download](https://img4.goodfon.com/wallpaper/nbig/b/2d/fanning-island-kiribati-tabuaeran-tropiki-ostrov-more-bereg.jpg)
Wallpaper sea, the sky, grass, the sun, clouds, trees, house, tropics, stones, shore, island, horizon, the bushes, Kiribati, Tabuaeran, Fanning Island images for desktop, section пейзажи - download
FSWN Fanning Springs - FSWN Fanning Springs at sunset and it's 66.9 F - https://dixie.weatherstem.com/fswnfanningsprings. Tag image: https://www.weatherstem.com/clouds?ts=1609281010&camera=1648 | Facebook
![Fanning Atoll, Kiribati, lagoon, beach, paradise, Pacific Ocean, shoreline, island, HD wallpaper | Peakpx Fanning Atoll, Kiribati, lagoon, beach, paradise, Pacific Ocean, shoreline, island, HD wallpaper | Peakpx](https://w0.peakpx.com/wallpaper/413/125/HD-wallpaper-fanning-atoll-kiribati-lagoon-beach-paradise-pacific-ocean-shoreline-island-clouds-palms.jpg)
Fanning Atoll, Kiribati, lagoon, beach, paradise, Pacific Ocean, shoreline, island, HD wallpaper | Peakpx
![A winter tree with its branches fanning outward stands with heavy clouds behind it. There is grass in the foreground and hedges beyond Stock Photo - Alamy A winter tree with its branches fanning outward stands with heavy clouds behind it. There is grass in the foreground and hedges beyond Stock Photo - Alamy](https://c8.alamy.com/comp/2ATY8TG/a-winter-tree-with-its-branches-fanning-outward-stands-with-heavy-clouds-behind-it-there-is-grass-in-the-foreground-and-hedges-beyond-2ATY8TG.jpg)
A winter tree with its branches fanning outward stands with heavy clouds behind it. There is grass in the foreground and hedges beyond Stock Photo - Alamy
![A line of winter trees with their branches fanning outward standing with heavy clouds behind them. There is grass in the foreground and hedges beyond Stock Photo - Alamy A line of winter trees with their branches fanning outward standing with heavy clouds behind them. There is grass in the foreground and hedges beyond Stock Photo - Alamy](https://c8.alamy.com/comp/2B2KY6T/a-line-of-winter-trees-with-their-branches-fanning-outward-standing-with-heavy-clouds-behind-them-there-is-grass-in-the-foreground-and-hedges-beyond-2B2KY6T.jpg)
A line of winter trees with their branches fanning outward standing with heavy clouds behind them. There is grass in the foreground and hedges beyond Stock Photo - Alamy
![The layered clouds fanning are reflected in water, Stock Photo, Picture And Royalty Free Image. Pic. WR3053795 | agefotostock The layered clouds fanning are reflected in water, Stock Photo, Picture And Royalty Free Image. Pic. WR3053795 | agefotostock](https://previews.agefotostock.com/previewimage/medibigoff/bab8bc8f00b3a82ab2f8e5fe1e932789/wr3053795.jpg)