Why Did the Sea Change Color Off Florida’s West Coast?
An unusual color change in the waters off Florida’s coast was recorded by NASA satellites
By Andreína Barreto, February 27, 2026
In late January and early February 2026, the waters of the continental shelf off Florida’s West Coast showed an unusual change in color.
What is normally seen as a deep blue acquired brighter tones, ranging from light blue to green, visible even from space. Satellite images released by NASA documented the transformation and allowed scientists to analyze what happened in this area known as the West Florida Shelf.
Comparative photographs taken on January 24 and February 3 by the MODIS sensor aboard the Terra satellite, and by the OLI spectrometer on the Landsat 9 satellite, show the reflection of suspended sediment particles that alter the way light is reflected on the sea surface.
According to information published by NASA, this color comes primarily from calcium carbonate residue, composed of the remains of marine organisms that inhabit the seabed of this shallow ocean platform.
These sediments were stirred up by the winds associated with the cold air mass, which agitated the waters and caused the material to remain suspended.
What do the specialists say?
Experts like James Acker, an Earth Sciences analyst with NASA’s data services, point out that similar events are usually linked to hurricanes, which appear with intense winds.
However, Acker highlighted that, on this occasion, a relatively intense cold front triggered a comparable reaction in an atypical climatic context for the region.
“Another interesting aspect of these events is that the cold air cools the shallow water at the shores and makes it denser than the surrounding warmer open ocean water,” Acker said. The expert added that these phenomena can form when narrow channels of denser, colder seawater carry offshore sediments that then encounter slower-moving waters in the Gulf, which twist and condense into pairs of eddies.
Acker said that these types of features have been observed in other natural events, such as dust storms, both on Earth and on Mars.
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