Rare Noctilucent Clouds Visible in Northern Hemisphere Skies This Summer
Noctilucent clouds, one of the rarest atmospheric phenomena, are now visible in the northern hemisphere. These clouds form in the mesosphere, approximately 50 miles (80 kilometers) above Earth's surface, and are composed of tiny ice water crystals. Their high altitude allows them to reflect sunlight long after sunset and before dawn, creating a striking silver and blue glow against the twilight sky. According to NASA, these clouds are visible between mid-May and mid-August, with peak sightings typically occurring in July. Recent observations include sightings over Kennewick, Washington, and Flensburg, Germany. The British Astronomical Association and the UK Met Office note that these clouds are most commonly seen at latitudes between 45° and 80° north, particularly near polar regions where the mesosphere is coldest. 
