Ocean turns tropical, turquoise blue ahead of peak tourism season on the East Coast

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Before and after: Phytoplankton blooms along the Mid-Atlantic coast

Satellite imagery shows the before and after view of phytoplankton blooms on the Mid-Atlantic coast. The first image is from March 2026 and the second image shows conditions two months later.

If you're looking for tropical waters, you may not have to travel that far.

The color of the ocean is appearing brighter than normal with a turquoise blue tint along the Mid-Atlantic coast, and there's a reason for it.

Satellite imagery from NASA showcases the color change, with the ocean appearing much brighter than normal in areas such as the Jersey Shore. You can see enormous swirling patches offshore, fueled by a mixture of spring sunlight, nutrient-rich waters and seasonal ocean upwelling, according to NASA.

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Starting in early April, satellites started detecting a patch of brownish, blue-green water lingering off the coasts of New Jersey, Delaware, Maryland and Virginia.

A drone shot of the Belmar Beach and coastal road and buildings on a sunny day in Belmar, New Jersey, USA

(Wirestock / Getty Images)

The colors and patterns appear to be most intense in the shallow coastal zone where the waters of Raritan Bay, Delaware Bay and Chesapeake Bay merged with the Atlantic Ocean — an area known as the Mid-Atlantic Bight.

The Mid-Atlantic Bight falls between Cape Hatteras, North Carolina, and Martha's Vineyard, Massachusetts. In this area, coastal phytoplankton blooms initiate in the winter and summer, although the timing and size of blooms varies from year to year.

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The area is not typically known for its Caribbean-like water. In fact, scientists consider the Mid-Atlantic to be "noisy" or "dirty" because rivers often discolor coastal waters with plumes of suspended sediment, water stained with colored dissolved organic matter and an array of microscopic and aquatic plant life, according to NASA.

A view of the Lifegaurd chair on the beach in Cape May, New Jersey

(Wirestock / Getty Images)

When this matter mixes with phytoplankton blooms, it becomes more difficult for scientists to distinguish and categorize blooms in shallow coastal zones compared to deeper, darker, more uniform waters of the open ocean, NASA said.

Why the water looks tropical

Scientists say the blue waters come from phytoplankton, which are microscopic plant-like organisms that float near the ocean's surface.

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When sunlight hits chlorophyll inside dense concentrations of the organisms, the water reflects bright blue and turquoise tones visible from aircraft and orbiting satellites.

Ocean view from Punta Sur at Isla Mujeres

(Mardoz / Getty Images)

The ocean off New Jersey typically appears darker green or gray because of sediment, algae and changing light conditions. This bloom changes that appearance dramatically.

But if you're on a boat in the middle of the ocean, the water might not look all that different to you.

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As phytoplankton multiply rapidly in nutrient-rich water, chlorophyll absorbs portions of sunlight while reflecting blue-green wavelengths, producing the glowing turquoise effect which is now visible in the Mid-Atlantic, according to NASA.

Aerial view of beautiful white cruise ship above luxury cruise in the ocean sea at early in the morning time concept smart tourism travel on holiday vacation time on summer

(Suphanat Khumsap / Getty Images)

As a result, locals and visitors are comparing the coastline to tropical destinations, like the Caribbean and the Bahamas.

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NASA's Earth Observatory and Goddard Space Flight Center have been closely tracking the bloom as it expands across the Mid-Atlantic coast.

Phytoplankton bloom seen on satellite imagery in the Mid-Atlantic.

(NASA / FOX Weather)

These blooms happen every year, but the scale and vivid coloring of this year's bloom have drawn attention. NASA said the combination of weather, nutrient levels and ocean currents this spring produced one of the region's most visually striking displays in recent memory.

Last year's bloom turned water in the Atlantic and Cape May counties a bright blue for several weeks before disappearing, according to NASA.

Beach sunsets cape May NJ

(jim Schlett / Getty Images)

"The colors are caused by light interacting with high concentrations of phytoplankton near the surface," scientists explained in NASA observations of the event.

But is it safe?

Luckily, the bloom poses little danger to those on the water, including swimmers, surfers and beachgoers, officials said.

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Phytoplankton form the foundation of the marine food chain and are essential to ocean ecosystems. Similar blooms happen every spring as temperatures rise and sunlight increases.

However, scientists say extremely large blooms can sometimes create temporary stress on marine life if massive amounts of phytoplankton die off at once.

When algae dies and sinks to the ocean floor, it is consumed by bacteria. This process consumes oxygen in the water and if the levels drop too low, it can stress and potentially kill fish and shellfish, according to researchers. These impacts tend to be very limited and short-lived.

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Oceanographers with Rutgers University said the bloom will likely fade once available nutrients in surface waters are depleted.

Unless storms, river runoff or additional upwelling replenish those nutrients, the tropical appearance will dissipate within weeks as ocean conditions return to normal.