Rare Roll Cloud Formation Amazes Beachgoers in Portugal During Heatwave

Understanding the Rare Roll Cloud

• ☁️ A roll cloud formation, an extremely rare meteorological event, was observed along the northern and central coast of Portugal.
• 💡 Such formations require a specific confluence of atmospheric conditions, often occurring at dawn or dusk.

Factors Contributing to the Formation

• 🌡️ The event occurred during a heatwave, with significant thermal gradients between the cold mornings and warmer sea surface temperatures.
• 🌊 The movement of the sea breeze during the evening played a crucial role in the cloud's formation and rotation.
• ⚠️ High surface temperatures on land prevented the cloud from developing further inland, causing it to remain localized and rotate on itself.