Portugal
Ballast ReefPut-in-Bay
borderline Ultra · subscribers
in the headland's lee today — swell from the quarter/behind
- window
- —
The full spot briefing is part of the subscription: entry, bottom, hazards, tide window.
Open in the appPut-in-Bay spearfishing forecast — wind, swell, visibility & live cameras
5.2
wave 0.3 m head-on
visibility2m
Today — right on the edge — wave, wind and visibility.
Sources: IPMA · buoys · Copernicus · Sentinel-2 — high confidence · data 08:14
Sources & confidence
- Sources
- IPMA · NDBC & IH buoys · Copernicus Marine · Sentinel-2
- Method
- spearo sea-state engine: 6-model consensus + satellite clarity (ZSD) + buoy-bias checks
- Freshness
- Re-read every hour, per coast
Compiled by the spearo sea-state engine · How it works →
The verdict comes from seven water factors and hard safety gates — not ten tabs. Go or stay.
How we score the water
Our own model
Our own forecast engine — not a third-party widget. It weighs these water factors into one go-or-stay verdict for this coast; the 0–10 dial is that verdict, read out as a number.
- Swell & wave memory
- Height, period and direction of the swell, plus the wake of recent storms — an old storm still stirs the water, and the engine remembers.
- Wind & gusts
- Speed and gusts, hour by hour — wind speed and an onshore push chop the surface and cut visibility.
- Tides — none here
- The Great Lakes are fresh water: there is no tide, so this factor never moves the verdict. The level is pushed around by wind setup and seiche instead.
- Water temperature
- Lake surface temperature from NOAA GLERL's GLSEA daily composite, not an ocean model — sharply cold water vetoes a green verdict.
- Currents & outflow
- Direction and drift of the current — it pushes you, and it drags turbid coastal water across where you dive.
- Rain runoff & air clarity
- Rain muddies the water inshore through land runoff, while fog and haze cut visibility at the surface.
- Coast shape & exposure
- How the coast faces the swell — a sheltered cove keeps the water clean; an exposed, head-on point takes a penalty.
Safety gates
- Thunderstorm forecast — an instant red, no exceptions.
- An official warning (MeteoAlarm / IPMA) — yellow, or red for the higher ranks.
- Missing input data — a would-be green is capped to yellow rather than overstated.
- Strong disagreement between forecast models — a green day is pulled back to yellow.
- Night hours — where night spearfishing is banned by law the window is forced red; where it is legal (Australia outside NSW, New Zealand, South Africa) it is capped at yellow, never green.
It all folds into a single 0–10 score and one verdict: go or stay.
A forecast, not a guarantee — the sea has the last word.
Where to get in, where to hunt
Entry points with coordinates
Seabed relief — promising ground
Coming soon
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