Met Office: Noctilucent cloud over Darlington and Durham

Noctilucent clouds, also known as "night-shining" clouds, form at altitudes of around 200,000 feet in the layer of the atmosphere known as the mesosphere.

The rare clouds in Darlington (Image: YVONNE ALDERSON) They are the highest clouds in the Earth's atmosphere and are typically seen between latitudes of 45° and 80° in both hemispheres, making the north of England a prime viewing location during the right conditions in summer months.

Visible only under very specific circumstances, these clouds occur when the sun is below the horizon and the lower atmosphere is dark, but the upper atmosphere is still illuminated by sunlight.

This unique positioning causes the clouds—made up of tiny ice crystals—to glow in hauntingly beautiful shades of silver, blue, and occasionally orange or red.

Their shimmering streaks are often mistaken for thin cirrus clouds but can be distinguished by their height and the fact that they appear well after sunset.

Noctilucent Clouds from Steetley Pier (Image: PAUL GALE) The recent display over Darlington was one of the clearest sightings in years, drawing attention from amateur astronomers, photographers, and curious onlookers alike.

Many took to social media to share images of the spectacle, with some describing the scene as “otherworldly” and “mesmerising.”

The Met Office confirmed the phenomenon early Monday morning, noting that the clear, calm summer conditions were perfect for noctilucent cloud formation.

Despite their high altitude and beauty, noctilucent clouds are not linked to any changes in ground-level weather patterns.

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Scientists are still unlocking the secrets behind these elusive clouds.

It’s understood that a combination of water vapour, extremely low temperatures, and high-altitude dust particles—often from meteors—is necessary for their formation.

Increasing occurrences in recent decades have raised questions about the possible influence of climate change and human activities, including the presence of methane and pollutants in the upper atmosphere.

Residents who caught a glimpse of the clouds are unlikely to forget the experience.

“I’ve never seen anything like it,” said one Darlington resident. “The sky looked magical—like something from a dream.”

While noctilucent clouds are rare, the summer months from mid-June to mid-July offer the best chance of sightings in northern parts of the UK.