High Tide Bulletin: Summer 2020

When you may experience higher than normal tides between June and August 2020.

The rising and falling of the sea is a phenomenon upon which we can always depend. 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. This bulletin tells you when you may experience higher than normal high tides for the period of time between between June and August 2020.

We also publish annual high tide flooding reports that present a broad outlook of what to expect for a given year in terms of high tide flooding, as well as a summary of high tide flooding events for the previous calendar year.

Regional outlook map

Select a region below to see when you may experience higher than normal tides from June and August 2020. 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.

Northeast outlook

Includes Maine, New Hampshire, Massachusetts, Connecticut, and New York

When will the tides be higher than normal?

  • June 3-8

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 Summer due to changing weather patterns and increasing water temperatures.

What kind of impact might I expect along the coast?

  • Due to the topography of the northeast (less low lying areas), high tides alone will likely not cause a significant impact on the coast unless accompanied by a storm or strong winds.

Where might I expect high tide flooding?

  • Bar Harbor, Maine; Portland, Maine; Boston, Massachusetts; Providence, Rhode Island; Kings Point, New York.

Regional outlook Text Only

Northeast outlook

Includes Maine, New Hampshire, Massachusetts, Connecticut, and New York.

When will the tides be higher than normal?

  • June 3-8

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 Summer due to changing weather patterns and increasing water temperatures.

What kind of impact might I expect along the coast?

  • Due to the topography of the northeast (less low lying areas), high tides alone will likely not cause a significant impact on the coast unless accompanied by a storm or strong winds.

Where might I expect high tide flooding?

  • Bar Harbor, Maine; Portland, Maine; Boston, Massachusetts; Providence, Rhode Island; Kings Point, New York.

Mid-Atlantic outlook

Includes New Jersey, Delaware, Pennsylvania, Maryland, District of Columbia, Virginia.

When will the tides be higher than normal?

  • June 3-7

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 Summer 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.

Where might I expect high tide flooding?

  • The Battery, New York; Bergen Point, New York; Sandy Hook, New Jersey; Atlantic City, New Jersey.

Southeast outlook

Includes North Carolina, South Carolina, Georgia, Eastern Florida coast.

When will the tides be higher than normal?

  • June 3-7

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 Summer 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.

Where might I expect high tide flooding?

  • Myrtle Beach, South Carolina; Charleston, South Carolina; Fort Pulaski, Georgia; Fernandina Beach, Florida.

Gulf Coast outlook

Includes Texas, Louisiana, Mississippi, Alabama, Western Florida coast.

When will the tides be higher than normal?

  • The Gulf is unlikely to experience coastal flooding based primarily on tides this summer.

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

Includes California, Oregon, Washington State.

When will the tides be higher than normal?

  • June 3-7

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 summer 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.

Where might I expect High Tide Flooding?

  • San Diego, California; Humboldt Bay, California.

Hawaii and the Pacific Islands outlook

Includes Hawaii, Guam, American Samoa, Midway, Kwajalein, and Wake Island.

When will the tides be higher than normal?

  • Hawaii and the Pacific Islands are unlikely to experience coastal flooding based primarily on tides this summer.

ALASKA outlook

When will the tides be higher than normal?

  • Alaska is unlikely to experience coastal flooding based primarily on tides this summer.

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.