High Tide Bulletin: Spring 2017

When you may experience higher than normal tides from March through May 2017.

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 March and May 2017.

Note: Depending on non-tidal conditions (wind, storms, etc.) regions may experience impacts before or after the dates mentioned here.

Regional outlook map

Select a region below to see when you may experience higher than normal tides from March-May 2017.

NOTE: Higher than normal high tides alone do not necessarily cause coastal flooding. However, nuisance flooding 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.

West Coast Outlook

Includes California, Oregon, Washington State

When will the tides be higher than normal?

  • May 26th - 27th

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 as we approach the June 21 summer solstice, due to the position of the sun relative to the equator.

What kind of impact might I expect along the coast?

  • Minor tidal flooding along the coast, especially in low-lying areas.
  • If a local storm or large swell are present at this time, increased levels of tidal flooding and coastal erosion may occur.
  • Lower than normal low tides will also occur.

Have a photo that shows coastal flooding in your region? Send it to us!

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Regional outlook (Text only)

Northeast outlook

Includes Maine, New Hampshire, Massachussets, Connecticut, New York

When will the tides be higher than normal?

  • April 27th - 29th, May 25th - 28th

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.
  • In May, mean sea level will be higher 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), tidal flooding will generally not have a significant impact on the coast unless there is a severe storm

Mid-Atlantic outlook

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

When will the tides be higher than normal?

  • April 27th - 29th, May 25th - 28th

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 as we approach the June 21 summer solstice, due to the position of the sun relative to the earth's equator.
  • In May, mean sea level will be higher 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.

Southeast outlook

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

When will the tides be higher than normal?

  • April 28th, May 26th - 27th

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 as we approach the June 21 summer solstice, due to the position of the sun relative to the earth's equator.
  • In May, mean sea level will be higher 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.

Gulf Coast outlook

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

When will the tides be higher than normal?

  • The Gulf Coast will not be significantly impacted.

Why not?

  • 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?

  • May 26th - 27th

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 as we approach the June 21 summer solstice, due to the position of the sun relative to the earth's equator.

What kind of impact might I expect along the coast?

  • Minor tidal flooding along the coast, especially in low-lying areas.
  • If a local storm or large swell are present at this time, increased levels of tidal flooding and coastal erosion may occur.
  • Lower than normal low tides will also occur.

Hawaii and the Pacific Islands outlook

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

When will the tides be higher than normal?

  • May 27th

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 as we approach the June 21 summer solstice, due to the position of the sun relative to the earth's equator.

What kind of impact might I expect along the coast?

  • Minor tidal flooding along the coast, in particular in low-lying areas.
  • If a local storm or large swell is present at this time, increased levels of tidal flooding and coastal erosion may occur.
  • Lower than normal low tides will also occur.

ALASKA outlook

When will the tides be higher than normal?

  • May 26th - 27th

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 as we approach the June 21 summer solstice, due to the position of the sun relative to the earth's equator.

What kind of impact might I expect along the coast?

  • Due to the topography of Alaska (less low lying areas), tidal flooding will generally not have a significant impact on the coast unless there is a severe storm.