JACKSONVILLE, Fla – Sea fog season typically pick up around Northeast Florida heading into late winter and spring.
Some of the densest fog in the state occurs in our area due to the cold shelf water off our coast.
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As warm moist air drifts in from the Atlantic Ocean and encounters the colder coastal water, the air chills to a point where moisture condenses forming fog.
Often the fog dissipates by mid-morning but can linger offshore only to be blown in by winds.
Fog will not develop as much when the water climbs over 68 degrees limiting the densest fog events to February through April.
The extent of colder nearshore water can extend over many miles increasing the density and extent of sea fog.
Fog can become trapped between the coast and where the water begins to warm up more than 60 miles offshore north Florida in the Gulf Stream.
Heaviest fog events develop when high pressure builds east of Florida resulting in onshore warm moist southeasterly airflow with dew points in the 60’s to near 70°F.