The Great Lakes: More Perilous Than the Ocean?

At first glance, the Great Lakes may appear serene, but beneath their surface lies a treacherous reality.

Unlike the ocean's rolling swells, waves here are steeper and more closely spaced, making them unpredictable and challenging to navigate.

Paul Christensen, an experienced mariner, notes that waves on the Great Lakes build rapidly, akin to the difference between a swimming pool and a bathtub—it takes less energy to stir the waters in a confined space.

Advancements in technology and forecasting have improved safety since the tragic sinking of the SS Edmund Fitzgerald in 1975.

However, experts caution against underestimating these inland seas.

John Lenters, a climate and lake scientist, explains that the Great Lakes' waves are primarily generated by local storms, leading to choppy conditions.

In contrast, ocean waves often result from distant storms, creating smoother, more predictable swells.

Additionally, the proximity of waves in the Great Lakes means large ships can be caught on multiple crests simultaneously, causing structural stress.

This phenomenon has led to vessels like the SS Daniel J. Morrell breaking apart during storms.

Seasonal variations also play a role.

In the fall, cold air over warm lake waters creates unstable conditions, leading to larger, more unpredictable waves.

Furthermore, freshwater freezes faster than saltwater, posing additional hazards during colder months.

Freshwater spray can quickly coat ships in ice, adding significant weight and instability.

Understanding these unique challenges is crucial for those navigating or enjoying the Great Lakes.

Respecting their power and unpredictability can mean the difference between a safe voyage and a perilous one.