A nautical adage suggests that a reddish sunrise implies incoming inclement weather. The atmospheric phenomenon causing this effect involves dust and other small particles trapped in the air. When morning light passes through this particle-filled atmosphere, the shorter wavelengths (blues and greens) are scattered away, leaving the longer wavelengths (reds and oranges) to dominate the sky’s appearance. This is often interpreted by sailors and others familiar with weather patterns as a sign that a storm system, typically moving from west to east, is approaching.
The importance of this weather lore lies in its potential to provide early warning of changing conditions. Historically, seafarers relied heavily on such observations for safety and navigational decision-making. The phrase served as a readily remembered shorthand, allowing for quick communication and prompting preparations for rough weather. While modern meteorological tools are available, the proverb retains cultural significance and can still offer a preliminary indication of atmospheric changes.