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NOAA safeguarding navigation in New York Harbor

February 5, 2020

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tides and currents

Two large red-colored sensors sit on the deck of a ship.The New York City skyline can be seen in the background. NOAA oceanographers deploy sensors like these in the water to measure the tidal currents for a period of time and then return to collect them. These two were recovered from the Hudson River, just off the coast of lower Manhattan.

Spring 2020 high tide outlook is now available

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tides and currents

Downtown Annapolis, Maryland, pictured here in 2012, is one of three major East Coast urban areas already being faced with nuisance flooding in excess of 30 days per year.

View real-time water levels and winds for Hurricane #Dorian

August 29, 2019

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tides and currents

As the forecast track for Hurricane Dorian takes it towards Florida this weekend, it will coincide with higher than normal tides. Potential storm surge occurring on top of these larger high tides could result in coastal flooding.

How many high tides are there per day?

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tides and currents

A tidepool in Monterey Bay National Marine Sanctuary.

NOAA experts to summarize 2017 U.S. high tide flooding

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tides and currents

Nuisance flooding along the Potomac River in Alexandria, Virginia, during a Spring 2016 "Supermoon."

Podcast: The motion of the ocean

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tides and currents

The Gulf Stream.

Spring 2019 high tide outlook now available

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tides and currents

Flooding in Annapolis, Maryland.

Summer high tide 2017 outlook now available

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tides and currents

Flooding in Annapolis, Maryland.

Summer 2018 high tide outlook now available

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tides and currents

Downtown Annapolis, Maryland, pictured here in 2012, is one of three major East Coast urban areas already being faced with nuisance flooding in excess of 30 days per year.

2017 NOAA tide tables are now available

November 2, 2016

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tides and currents

Ocean waves recede along a rocky beach shoreline.

Fall 2016 high tide bulletin now available for U.S. coasts

September 13, 2016

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tides and currents

Nuisance flooding along the Potomac River in Alexandria, Virginia, during a Spring 2016 "Supermoon."

NOAA engineers a better ocean current sensor for mariners

August 24, 2016

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tides and currents

Max Ivanov and Scott Mowery with NOAA's Center for Operational Oceanographic Products and Services install an improved current sensor system on a navigation buoy in Chesapeake Bay. The system transmits real-time current speed and direction observations via satellite to help mariners more safely navigate busy shipping channels.

Tides

Most coastal areas experience two low tides and two high tides every lunar day, or 24 hours and 50 minutes.

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Ocean & Coasts Education

Ocean currents

Map of temperature of the North Atlantic Ocean shows the warm Gulf Stream current along the East Coast of the United States transporting heat northward towards the cooler high latitudes.

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Ocean & Coasts Education

King tides and El Niño team up to threaten California coast

January 27, 2016

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coastal communities

tides and currents

King tides and El Niño team up to threaten California coasts.
Coastal flooding could last through winter.