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1. Home
2. News
3. High Tide Flooding Archive
4. High Tide Bulletin: Spring 2021

NOAA High Tide Bulletin
          SPRING 2021: When you may experience higher than normal tides
            between March and May, 2021.


Tides are the regular rise and
          fall of the sea surface caused by the gravitational pull of the moon and sun and their position relative to
          the earth. There are some factors that cause the tides to be higher than what is "normally" seen from day to
          day. Depending on non-tidal conditions (wind, storms, etc.), regions may experience impacts before or after
          the dates mentioned here. Higher than normal high tides alone do not necessarily cause coastal flooding. However, they are becoming
          increasingly impactful due to continued sea level rise. High tide
            flooding that inundates busy streets, and
          washes out beaches is more likely to occur during these periods depending on your location along the coast.
          More severe flooding may result if adverse weather—heavy rains, strong wind or big waves—conditions are
          present.  Want to dig deeper? View the latest annual report
          summarizing
          *high tide flooding events in 2019* and our *high tide flooding outlook through April 2021.*
          This report is based on new, national flooding thresholds. It focuses on more impactful, deeper floods at some locations and
          expands the outlook to about 100 coastal locations.
 Select Your Region Select your region to see when you may experience higher than normal tides that may cause flooding. NOAA Coastal Inundation Dashboard The NOAA Coastal Inundation Dashboard provides real-time water levels with forecasts out to 48 hours for all tidal stations. High Tide Flooding Bulletin: Historical
                  Archive View an archive of past high tide flooding dates for all regions. Center for Operational Oceanographic
                  Products and Services (CO-OPS) CO-OPS is the NOAA tides and currents office. Print High Tide Bulletin Print or save this bulletin as a PDF document.
 NORTHEAST OUTLOOK
 Dates: March 29 - April 2, 2021
                          April 26 - May 1, 2021
                          May 24 - May 30, 2021 (The predicted tides at some locations will
                            be some of the highest of the year) Locations: Tide stations at the following locations have the greatest chance of seeing high tide
                          flooding: Bar Harbor, Maine; Portland, Maine; Boston, Massachusetts; Providence, Rhode Island; Kings Point, New York
                            Visit the NOAA Coastal Inundation Dashboard for this region to view real-time water levels with forecasts out to 48 hours.
 Why will they be higher than normal? A perigean spring tide will be occurring. This is when the
                            moon is either new or full and closest to earth. Higher than normal high tides and lower than normal low tides
                            will occur.
                            Tides will increase leading up to and after the June 21 summer solstice, due to the position of the sun relative to the earth's equator.
                            Mean sea level is typically higher in the late spring due to changing weather patterns and increasing water temperatures. What kind of impact might I expect along the coast? Some of the Northeast will experience their highest tides of
              2021 in May and in some locations are predicted to exceed flood thresholds from tides alone.
              For March and April, high tides alone will likely not cause a
              significant impact on the coast in most areas unless accompanied by a storm or strong winds.
              Lower than normal low tides will also occur.
 MID-ATLANTIC OUTLOOK
 Dates: March 28 - April 1, 2021
            April 26 - April 30, 2021
            May 24 - May 29, 2021 (The predicted tides at some locations will
              be some of the highest of the year) Locations: Tide stations at the following locations have the greatest chance of seeing high tide
            flooding: The Battery, New York; Bergen Point, New York; Sandy Hook, New Jersey; Atlantic City,New Jersey; Cape May, New Jersey; Lewes, Delaware
              Visit the NOAA Coastal Inundation Dashboard for this region to view real-time water levels with forecasts out to 48 hours.
 Why will they be higher than normal? A perigean spring tide will be occurring. This is when the
              moon is either new or full and closest to earth. Higher than normal high tides and lower than normal low tides
              will occur.
              Tides will increase leading up to and after the June 21
              summer solstice, due to the position of the sun relative to the earth's equator.
              Mean sea level is typically higher in the late spring due to
              changing weather
              patterns and increasing water temperatures. What kind of impact might I expect along the coast? Some of the Mid Atlantic will experience their highest tides of 2021 in May
                            Minor tidal flooding along the coast will occur, particularly in low-lying areas.
                            If a storm occurs at this time, increased levels of tidal flooding and coastal erosion may occur.
                            Lower than normal low tides will also occur.
 SOUTHEAST OUTLOOK
 Dates: March 29 - April 1, 2021
            April 26 - April 30, 2021
            May 24 - May 29, 2021 (The predicted tides at some locations will
              be some of the highest of the year) Locations: Tide stations at the following locations have the greatest chance of seeing high tide
            flooding: Duck,  North Carolina; Myrtle Beach, South Carolina; Charleston, South Carolina; Fort Pulaski, Georgia; Fernandina Beach, Florida
              Visit the NOAA Coastal Inundation Dashboard for this region to view real-time water levels with forecasts out to 48 hours.
 Why will they be higher than normal? A perigean spring tide will be occurring. This is when the
              moon is either new or full and closest to earth. Higher than normal high tides and lower than normal low tides
              will occur.
              Tides will increase leading up to and after the June 21
              summer solstice, due to the position of the sun relative to the earth's equator.
              Mean sea level is typically higher in the late spring due to changing weather patterns and increasing water temperatures. What kind of impact might I expect along the coast? Minor tidal flooding along the coast will occur, particularly in low-lying areas.
            If a storm occurs at this time, increased levels of tidal flooding and coastal erosion may occur.
              Lower than normal low tides will also occur.
 GULF COAST OUTLOOK
 Dates: March - May, 2021 Locations: Texas, Louisiana, Mississippi, Alabama, Western Florida coast.
 Why will they be higher than normal? The Gulf Coast will not be significantly impacted. Why won’t they be impacted? In many locations of the Gulf Coast, the tidal range is relatively small compared to other regions of the U.S, so they will not be as significantly impacted by a perigean spring tide.
 WEST COAST OUTLOOK
 Dates: No dates in March and April
                May 25 - May 28, 2021 (The predicted tides at some locations will
                  be some of the highest of the year) Locations: Tide stations at the following locations have the greatest chance of seeing high tide
                flooding: Humboldt Bay, California; San Diego, California
                  Visit the NOAA Coastal Inundation Dashboard for this region to view real-time water levels with forecasts out to 48 hours.
 Why will they be higher than normal? A perigean spring tide will be occurring. This is when the moon is either new or full and closest to earth. Higher than normal high tides and lower than normal low tides will occur.
                  Tides will increase leading up to and after the June 21 summer solstice, due to the position of the sun relative to the earth's equator.
                  Mean sea level is typically higher in the late spring due to changing weather patterns and increasing water temperatures. What kind of impact might I expect along the coast? Minor tidal flooding along the coast, in particular in low-lying areas
                  If a storm occurs at this time, increased levels of tidal flooding and coastal erosion may occur
                  Lower than normal low tides will also occur.
 PACIFIC ISLANDS OUTLOOK
 Dates: No dates for March
            April 26 - April 30, 2021
            May 25 - May 28, 2021 (The predicted tides at some locations will
              be some of the highest of the year) Locations: Tide stations at the following locations have the greatest chance of seeing high tide
            flooding: Hawaii, Guam, American Samoa, Midway, Kwajalein, and Wake Island.
              Visit the NOAA Coastal Inundation Dashboard for this region to view real-time water levels with forecasts out to 48 hours.
 Why will they be higher than normal? A perigean spring tide will be occurring. This is when the
              moon is either new or full and closest to earth. Higher than normal high tides and lower than normal low tides
              will occur.
              Tides will increase leading up to and after the June 21
              summer solstice, due to the position of the sun relative to the earth's equator.
              Mean sea level is typically higher in the late spring due to changing weather patterns and increasing water temperatures. What kind of impact might I expect along the coast? Minor tidal flooding along the coast, in particular in low-lying areas
              If a storm occurs at this time, increased levels of tidal flooding and coastal erosion may occur
              Lower than normal low tides will also occur.
 ALASKA OUTLOOK
 Dates: March 28 - April 1, 2021
            April 26 - April 30, 2021
            May 25 - May 29, 2021 (The predicted tides at some locations will
              be some of the highest of the year) Locations: Tide stations at the following locations have the greatest chance of seeing high tide
            flooding: Alaska
              Visit the NOAA Coastal Inundation Dashboard for this region to view real-time water levels with forecasts out to 48 hours.
 Why will they be higher than normal? A perigean spring tide will be occurring. This is when the
              moon is either new or full and closest to earth. Higher than normal high tides and lower than normal low tides
              will occur.
              Tides will increase leading up to and after the June 21
              summer solstice, due to the position of the sun relative to the earth's equator.
              Mean sea level is typically higher in the late spring due to
              changing weather
              patterns and increasing water temperatures. What kind of impact might I expect along the coast? Due to the topography, in particular for southeast Alaska (less low lying areas), tidal flooding will generally not have a significant impact on the coast unless there is a severe storm. Lower than normal low tides will also occur.
              Lower than normal low tides will also occur.


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