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# High Tide Bulletin: Fall 2017

## When you may experience higher than normal tides from September through November 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  September and November 2017.

## Regional **outlook** (Text only)

          -  Northeast 
          -  Mid-Atlantic
          -  Southeast
          -  Gulf Coast
          -  West Coast
          -  Pacific Islands
          -  Alaska

## **Northeast** outlook

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

### **When will the tides be higher than normal?**

            - November 4-6

### **Why will they be higher than normal?**

            - Mean sea level is generally higher in the early fall months in the northeast due to warmer, expanding ocean water and changes in weather patterns.
            - 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.

### **What kind of impact might I expect along the coast?**

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

### **Where might I expect high tide flooding?**

            - Areas near the tide station at Kings Point, NY have the greatest chance of seeing high tide flooding.

## **Mid-Atlantic** outlook

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

### **When will the tides be higher than normal?**

            - October 7-9, November 4-7

### **Why will they be higher than normal?**

            - Mean sea level is generally higher in the early fall months in the Mid Atlantic due to warmer, expanding ocean water and changes in weather patterns.
            - In November, 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.

### **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?**

            - Areas near the tide station at Cape May, NJ have the greatest chance of seeing high tide flooding.

## **Southeast** outlook

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

### **When will the tides be higher than normal?**

            - September 17-19, October 7-10, November 3-8

### **Why will they be higher than normal?**

            - Mean sea level is generally higher in the fall in the Southeast due to changing weather patterns and a decrease in Gulf Stream transport.
            - In November, 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.

### **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?**

            - Tide stations at the following locations have the greatest chance of seeing high tide flooding - Wilmington, NC; Beaufort, NC; Charleston, SC; Fort Pulaski, GA.

## **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 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?**

            - In September, October and November, water levels will not be significantly impacted by the Perigean Spring Tide.             

### **Why won’t they be higher than normal?**

            - The timing of the perigee is not closely aligned with the full or new moon, reducing the overall effect of the perigean spring tide.

## **Hawaii and the Pacific Islands** outlook

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

### **When will the tides be higher than normal?**

            - In September, October and November, water levels will not be significantly impacted by the Perigean Spring Tide. 

### **Why won’t they be higher than normal?**

            - The timing of the perigee is not closely aligned with the full or new moon, reducing the overall effect of the perigean spring tide.

## **ALASKA** outlook

### **When will the tides be higher than normal?**

            - November 4 - 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.

### **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.

Have a photo that shows coastal flooding in your region? Share it with us!

###### Quick **Links**

          - Center for Operational Oceanographic Products and Services:  the nation's official source for tidal information.
          - What is high tide flooding?
          - Why are there summer tides in the fall?
          - What is a perigean spring tide?
          - Archive of Past High Tide Bulletins

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