These stunning images show a rare lenticular cloud formation seen in the sky over Alnwick last Thursday morning.
Lenticular cloud form as strong winds blow over, and around, rugged terrain.
The formations get their name from their smooth, lens-like shape.
Under certain lighting conditions, bright colours can be seen along the clouds’ edges, a process called irisation.
Their saucer-like shape and irisation often results in the clouds being mistaken for UFOs.
While lenticular clouds can produce visually stunning formations, they also serve as a warning for pilots, indicating areas of severe turbulence and are avoided by planes.
The top picture was taken at South Charlton by Andy Grant of Brockleyhall Farm Cottages. The other photo was taken by Katie Biggs.
Email your pictures for consideration as Your Picture of the Week in the Northumberland Gazette to email@example.com