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Programs

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• Maritime Services
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    • Puget Sound Current Survey
  • NOCMP - Modeling
• Coastal Oceanographic Applications and Services of Tides and Lakes (COASTAL)
  • St. Charles Parish Real-Time Monitoring System
  • Storm QuickLooks
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  • Sea Level Trends
  • Marsh Restoration
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  • Marsh Restoration Tool - MAPTITE
  • Inundation Analysis
  • Extreme Water Levels
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Education

• Tides
  • What are Tides?
  • What causes Tides?
  • Gravity, Inertia, and the Two Bulges
  • Changing Angles and Changing Tides
  • Frequency of Tides - The Lunar Day
  • Tidal Variations - The Influence of Position and Distance
  • Types and Causes of Tidal Cycles
  • What Affects Tides in Addition to the Sun and Moon?
  • The Importance of Monitoring the Tides and Their Currents
  • How are Tides Measured? - The Old System
  • How are Tides Measured? - The New System
• Currents
  • The Challenge of Measuring Water Currents
    • Productive Water-borne Commerce, Maneuvering in Confined Waterwayss
  • NOS Education - Currents
• For Teachers & Students
  • Tides Lesson Plans
  • Tides Roadmap to Resources
• Our Restless Tides
  • 1 - Introduction
  • 2 - The Astronomical Tide-Producing Forces
  • 3 - Detailed Explanation of the Differential Tide Producing Forces
  • 4 - Variations in the Range of the Tides
  • 5 - Factors Influencing the Local Heights
  • 6 - Prediction of the Tides
• About Tides and Water Levels
  • History of Tidal Analysis and Prediction
    • Harmonic Analysis
    • Tidal Constituents and Harmonic Analysis
  • Tide Predicting Machines
    • The William Ferrel Tide-Predicting Machine
    • Tide Predicting Machine No. 2
    • Tide Predicting Machines from Other Countries
  • How Do We Measure Water Levels?
    • Former Water Level Measurement System
    • New Water Level Measurement System
    • Comparisons of Former and New Water Level Measurement Systems
  • The Challenge of Measuring Water Currents

Help & About

• About
  • About the Center for Operational Oceanographic Products and Services (CO-OPS)
    • Mission Statement
    • Organizational Chart
    • Contact Information
  • CO-OPS Divisions
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    • CO-OPS Organization - Engineering Division
  • Site Map - You are currently on this page.
• Frequently Asked Questions
  • FAQ - Tide Predictions and Data
  • FAQ - Hydrographic and Oceanographic Agencies in Other Countries
  • FAQ - Tidal Current Predictions and Data
  • FAQ - Problems Accessing Data
• Reference
  • Tide and Current Glossary

Information

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Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services