Islamabad Today on Instagram: "⚡ A Cumulonimbus Incus Stuns Islamabad Sky on 7th Sept What is a Cumulonimbus? ❓ A towering thundercloud that rises high into the atmosphere with a flat, dark base and a glowing crown lit by lightning. Known as Incus (Latin for “anvil”), it is the only cloud type capable of producing thunder, lightning, hail, and torrential rain, often forming just a few hundred feet above the Earth’s surface. 👉 What happened? On 7th September 2025, residents of Islamabad,