Dictionary term
Slack Water
Direct answer
Slack Water is the brief interval when a tidal current speed is near its minimum before reversing or changing phase.
Slack Water is the low-current interval between flood and ebb flow.
Slack Water is the low-current interval between flood and ebb flow.
A Sun–Earth orientation for seasonal, atmospheric, tidal, and terrestrial terms.Quick reference
- Use when
- Use Slack Water from an official current-station prediction, not from a nearby high- or low-tide time alone.
- Do not use it for
- Slack Water is not guaranteed still water; wind, river discharge, eddies, and forecast error can leave dangerous flow.
- Reference category
- Seasons & Earth Almanac
- Related terms
- Tidal Bore, Growing Degree Day, Astronomical Season, Equinox
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The story behind Slack Water
Dedicated current observations showed that slack timing can differ substantially from vertical high and low water.
Slack Water in spiritual tradition
Spiritually, slack water can symbolize pause while real-world safety depends on local current data.
Slack Water: fact and faith, kept distinct
This is a factual calendar, astronomy, Earth-science, cultural-history, or observational reference. It can support wonder and practical planning without becoming a claim of fate, spiritual causation, or private revelation.
Slack Water in numerology
Slack Water is not a numerology claim. Any numbers attached to it should retain their ordinary scientific, calendrical, navigational, or historical meaning unless a separate symbolic interpretation is clearly labeled.
Why Slack Water matters
It can be important for diving, docking, bridge transit, and narrow-channel navigation.
Slack Water at work: an example
In an inlet, high tide at a harbor gauge may occur before or after slack current in the channel.
Where interpretation stops
Slack Water is presented as sourced astronomy, calendrical, Earth-science, cultural, or instrument-history reference. Definitions should distinguish measured phenomena from civil convention and historical interpretation, preserve location and time dependencies, and avoid turning factual sky data into a deterministic personal claim.
Sources and editorial method
Research references used for this entry include:
- NOAA Tides and Currents Glossary - Operational definitions for tides, tidal currents, ranges, datums, bores, and amphidromic systems.
- Source
- The Great Almanac Dictionary
- Category
- Seasons & Earth Almanac
- Also appears in
- Seasons & Earth Almanac
- Aliases
- None listed
- Last updated
- 2026-07-16
Check the current-station slack time
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Common questions
What is Slack Water?
Slack Water is the brief interval when a tidal current speed is near its minimum before reversing or changing phase.
How is Slack Water used in an almanac?
Use Slack Water from an official current-station prediction, not from a nearby high- or low-tide time alone.
What should I avoid when interpreting Slack Water?
Slack Water is not guaranteed still water; wind, river discharge, eddies, and forecast error can leave dangerous flow.
