John Hawley
Oct 27, 2026
Florida Weather and Landscapes Series: Part 3
High tides, persistent coastal winds and rainfall can combine to flood neighborhoods, stress plants and slow drainage. Here is what the October 2026 flooding in St. Augustine tells us about the risks—and what property owners can do.
On October 26, 2026, floodwater returned to St. Augustine’s Coquina Avenue after the street had been mostly dry earlier that morning. The day before, neighbors near Quarry Creek had used kayaks to move along a flooded residential street, and one resident reported creek water reaching her front yard. The scenes offered a vivid reminder that coastal flooding can reach landscapes well beyond the oceanfront.
The flooding threat continued beyond the weekend. In an October 27 bulletin, the National Weather Service Jacksonville extended its St. Johns River basin coastal flood warning through 2 a.m. Friday, October 30, forecasting moderate flooding during high tides. The warning covers areas including Trout River, South Central Duval, Eastern Clay, Eastern Putnam, Western St. Johns and Inland Flagler, giving this story a direct Jacksonville-area connection.
NWS warned of potential road closures, inundation of low-lying properties and some shoreline erosion. Warning coverage and expiration times differ by location and can change, so readers should check their local forecast. For homeowners, HOAs and landscape managers, the extension also means the receiving waters for neighborhood drainage systems may remain elevated through additional tide cycles.
October 27 Warning Extension: Why Jacksonville’s Riverfront Matters
Coastal flood warnings can apply well inland along tidal rivers and tributaries. The October 27 St. Johns River basin warning includes Jacksonville-area zones along Trout River and South Central Duval, illustrating why distance from the beach alone does not determine exposure. Water levels in connected waterways can affect both waterfront properties and the drainage systems serving nearby neighborhoods.
The warning establishes a regional flood threat; it does not identify a malfunctioning storm drain at a particular address. But it provides a concrete local setting for an important question: what happens when the waterway receiving neighborhood runoff is already high? The answer helps explain why lawns and streets may remain wet even when rainfall has eased.
What Is a King Tide, and Why Can It Flood St. Augustine?
A king tide is an exceptionally high predicted tide driven by the gravitational relationships among the Earth, moon and sun. High tides occur regularly, but their heights vary with those astronomical cycles and local coastal geography. Low-lying streets and properties near tidal creeks, marshes and waterways can flood when water rises high enough to spill beyond its usual boundaries.
Wind and weather can raise water levels above the predicted astronomical tide. Persistent onshore winds can push water toward the coast and impede its movement back out, while rain adds runoff to the system. NOAA notes that high-tide flooding can occur even on sunny days when tides, winds, currents and local conditions combine.
How Nor’easters and Northeast Winds Add to Coastal Flooding
A nor’easter is an East Coast storm whose coastal winds typically blow from the northeast. These storms can produce persistent winds, rough surf, rain and coastal flooding, though not every period of northeast wind is itself a nor’easter. The effect on any particular location depends on the storm’s position, wind direction and duration, rainfall and timing relative to the tide.
When elevated water persists through successive tides, a neighborhood may experience repeated flooding even after water temporarily recedes. A tide table estimates the astronomical component, but it does not by itself capture all the additional water pushed toward shore by weather. Residents should pair tide predictions with the latest local flood warnings and observed water levels.
What Does El Niño Have to Do With Florida Coastal Storms?
El Niño is a climate pattern involving warmer-than-average water in the central and eastern tropical Pacific. It can influence atmospheric circulation and shift the odds of wetter, stormier conditions across parts of the southern United States during the cool season. The U.S. Geological Survey says an El Niño pattern is more often associated with an increase in nor’easters and coastal storms in the Southeast, although every season is different.
El Niño does not create a king tide, and a single flooding event cannot be attributed to El Niño simply because the climate pattern is present. The immediate St. Augustine explanation is the combination of high astronomical tides, persistent northeast winds and local conditions. El Niño is useful context for understanding seasonal risk, not a substitute for the forecast for a specific storm or property.
Why High River and Tidal Water Can Keep Storm Drains From Emptying
A storm drain is an entrance to a drainage system; the water still needs an outlet. Many systems rely on gravity and a difference in water levels to move runoff toward a creek or river. When the receiving water rises, that difference shrinks, slowing discharge even if the grate is clear.
A submerged outlet does not automatically stop all flow: discharge depends on water levels throughout the system. If downstream water rises sufficiently, it can push backward through unprotected pipes and emerge through street drains or ditches. NOAA identifies submerged outfalls and backflow as ways coastal flooding can prolong flooding inland.
Backflow valves and tide gates can limit reverse flow, but they do not pump rainfall runoff out against high receiving water. While closed, they can leave runoff waiting for downstream levels to fall unless storage or pumping is available. NOAA also notes that elevated groundwater can reduce the soil’s ability to absorb runoff, adding pressure on drainage.
What This Means for Jacksonville Yards, HOAs and Drainage Repairs
For a property draining toward the St. Johns River or a connected tidal creek, the outlet condition belongs in the drainage assessment. Clearing an inlet can address debris, but it cannot lower the river. An additional yard drain may offer limited improvement if it connects to the same system whose discharge is restricted by high downstream water.
After water recedes, record where ponding occurred, how long it lasted and whether it rose and fell with the tide. A drainage professional can use those observations to assess grading, compaction, pipe capacity and receiving-water levels together. Any proposed pump, valve or new outlet needs an appropriate design and discharge location; moving water toward a neighboring property can create another problem.
Landscape recovery also depends on how long root zones remain saturated. Postpone equipment traffic and unnecessary irrigation on waterlogged areas, and assess planting conditions before installing sod, trees or shrubs. Persistent ponding after nearby waterways return to normal warrants closer investigation of the property and its drainage route.
Saltwater Flooding and Salt Spray Affect Plants Differently
Coastal landscapes may be exposed to salt in two distinct ways: salt carried through the air onto leaves, and salty or brackish water entering the soil around roots. Saltwater inundation can damage sensitive turf and landscape plants, while prolonged flooding also limits oxygen available to roots. The degree of damage depends on the plant, salinity, duration, soil and drainage.
A plant that handles salt spray is not necessarily suited to repeated saltwater flooding. Conversely, a plant that tolerates wet soil may still be sensitive to salt. Floodwater can be fresh, brackish, salty or contaminated, depending on its source and location; do not assume its salinity from appearance alone.
Windblown Salt and Sand Can Reach Beyond the Beach
The movement of sand and other particles by wind is called aeolian transport. On the coast, strong winds can carry sand and salt spray toward homes, lawns and planted beds, abrading foliage and leaving salt deposits. Wind can also remove moisture from leaves, producing symptoms that overlap with salt injury.
Damage may appear as browned leaf edges, scorched foliage or decline on the side facing prevailing winds, but those signs have other possible causes. Once conditions are safe, UF/IFAS recommends promptly rinsing salt spray from affected foliage with fresh water where practical. Follow current water-use rules and avoid adding water to already saturated soil unnecessarily.
What Flooding Means for New Sod and Landscape Plantings
The St. Augustine flooding also intersected with a real planting decision. Action News Jax reported that a Coquina Avenue resident was laying sod on a soaked lawn after previous storms delayed the delivery. The report does not establish that the sod was damaged, but the example shows why installation timing becomes complicated when high water repeatedly returns.
New sod needs good contact with soil and appropriate moisture while its roots establish, but a persistently flooded or saturated site can make preparation and establishment difficult. Heavy equipment and foot traffic on wet soil may worsen compaction or rutting. Before installation, assess whether the site can drain, whether another high tide is expected and whether the soil is firm enough to work without damage.
New trees and shrubs also need oxygen around their roots, even when irrigation is essential during establishment. A wet surface does not guarantee the entire root zone has the right moisture, and a dry-looking surface does not prove the soil below is dry. Check the soil and adjust watering to site conditions, plant needs and applicable restrictions rather than following a fixed schedule regardless of rainfall.
What Should Homeowners Do After Saltwater Flooding?
Wait for water to recede and authorities to indicate that conditions are safe before inspecting a flooded landscape. Photograph affected areas, note how long water remained and record whether the suspected source was tidal water, rainfall runoff or both. Floodwater may contain sewage or other contaminants, so avoid direct contact and follow local health guidance.
If saltwater inundation is suspected, consult UF/IFAS Extension or a qualified landscape professional about testing and recovery. UF/IFAS notes that, after water recedes, fresh water may be used to leach soluble salts from soil where conditions allow. Leaching requires a suitable fresh-water source and adequate drainage; adding water to a saturated site with no outlet can worsen waterlogging, and current water-use restrictions still apply.
Avoid rushing to replace every browned plant: some injury becomes clearer over time, and recovery varies by species and severity. Document visible changes, remove hazardous debris safely and seek an arborist’s assessment for damaged or unstable trees. Salt-tolerance lists are useful for replanting, but match each plant to its specific exposure, drainage, available space and cold tolerance.
Dunes and Coastal Landscapes: Why Beach Erosion Matters Inland
The Daytona Beach images that prompted this discussion show waves reaching far up the shore during a period of high water and strong onshore winds. A beach temporarily covered by water at high tide is not, by itself, proof that all of its sand has been permanently lost. A post-event assessment is needed to distinguish temporary inundation, sand movement offshore and lasting erosion.
Dunes and their vegetation help stabilize sand and can reduce wind and salt-spray exposure for areas landward. Damaged dunes may leave coastal properties more exposed to future waves and wind, making their condition relevant to landscape planning as well as shoreline protection. Dune work and planting can be regulated, so property owners should check with local and state authorities before altering a dune or removing vegetation.
A Practical Weather Lesson for Northeast Florida Landscapes
St. Augustine’s flooded streets show how a coastal event can reach yards through creeks and connected waterways. The October 27 warning extension for the St. Johns River basin brings the same concern into Jacksonville-area river and tributary neighborhoods. Daytona’s high surf illustrates another part of the same regional concern: exposure at the oceanfront, where waves, wind, sand and salt interact with dunes and planted areas. Each property’s risk depends on its elevation, drainage route, proximity to tidal water and the plants already in place.
As El Niño shapes the broader seasonal outlook, landscape decisions still need to be based on current conditions at the site. Watch forecasts and tides, inspect drainage after water recedes, and choose plants for the actual combination of salt, wind, flooding and soil conditions they will face. Check the latest local alerts before making weather-dependent plans.
Continue the series: Part 1: El Niño’s historic impacts on the Southeast and Florida | Part 2: El Niño vs. La Niña and Florida winter landscaping
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