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Jacksonville - FL, US, National Weather Service

Coastal waters from Altamaha Sound to Fernandina Beach FL out 20 NM

...PATCHY TO AREAS FOG ACROSS NEARSHORE WATERS OVERNIGHT... Moist air and light winds will produce areas of fog and low stratus overnight across the nearshore coastal waters and inland waterways. These conditions will allow for patches of dense fog with visibility of less than 1 NM at times. Marine interests should exercise caution tonight due to dense fog. Visibilities will be restricted to less than 1 nm at times. Navigation may be hazardous in restricted waterways and channels.