Prevelly
South West, WA · Shire of Augusta-Margaret River · Relative human–shark interaction conditions
Experimental · uncalibrated
Evidence freshness: 10 Nov 2026, 3:02 pm
Dominant evidence class for the index: Environmental habitat suitability
Why?
- •No live shark detections — this is not an operational alert
- •Water temperature (~18.3°C) favours great white shark thermal suitability
Shark interaction risk is assessed as MODERATE (public index 30.8/100) with moderate combined confidence. Primary drivers: No live shark detections — this is not an operational alert; Water temperature (~18.3°C) favours great white shark thermal suitability. No live shark-detection feed is connected. This is an experimental development assessment, not an operational warning. Always follow lifeguard instructions, beach closures, and official WA SharkSmart / DPIRD advice. vShark is not a government or SLSA product.
Species conditions
South-western transition hypothesis: still temperate-leaning, with increasing mixed-assemblage uncertainty toward Cape Naturaliste. Hypothesis to be tested.
Recent detections / sightings
No shark observations are stored for this location. That is a data gap, not evidence that sharks are absent. SharkSmart WA is not machine-connected.
CACHED rows are curated public notices, not a live tagged-shark feed, and do not enter the 0–100 as live detections.
Environmental state
- air_temperatureLIVE20.6 °C11 Nov 2026, 6:15 pm
- rainfall_24hLIVE0 mm11 Nov 2026, 6:15 pm
- rainfall_7dLIVE0.4 mm11 Nov 2026, 6:15 pm
- sstLIVE18.2 °C11 Nov 2026, 6:15 pm
- swell_heightLIVE1.96 m11 Nov 2026, 6:15 pm
- wind_direction_degLIVE142 deg11 Nov 2026, 6:15 pm
- wind_speed_knLIVE4.7 kn11 Nov 2026, 6:15 pm
Human exposure
- Class
- estimated
- Popularity proxy
- high
- Model exposure
- 0.45
Activity classes: surfing, bodyboarding, foiling
Estimated, not observed counts. No false precision.
Persistent spatial context
- beach
- reef
- river mouth
Geomorphology is persistent context, not a transient observation.
Data gaps
- turbidity proxy
- live detections
- recent detections
Missing data reduces confidence; it does not mean low risk.
Nearby locations
- Margaret River7.9 km
- Gracetown12.8 km
- Yallingup37.0 km
- Augusta40.4 km
- Dunsborough41.8 km
- Busselton49.1 km
Data coverage
Where vShark knows little is as important as where it knows more. Missing coverage does not mean low risk.
- Shark observation coverageNONE
SharkSmart WA / DPIRD detections are not machine-connected. No live tagged detections in vShark.
- Ocean coverageMODERATE
Open-Meteo marine SST and wave height at a regional centroid — not a beach sensor.
- Weather coverageMODERATE
Open-Meteo forecast weather at a regional centroid.
- Ecology coverageLOW
No live prey, whale, seal or productivity feed. Seasonal notes are hypotheses or climatology.
- Human exposure coverageLOW
Estimated from popularity class, weekday/weekend and swell. Not a head-count.
- Sensor coverageNONE
No acoustic, camera, drone or eDNA adapters connected.
- Historical coverageLOW
Incident reconstructions are added as frozen validation cases, not a complete history.
NOW / HISTORY — recent assessments
Append-only model outputs. New model versions do not rewrite these rows.
| When | Band | Index | Confidence | Model |
|---|---|---|---|---|
| 10 Nov 2026, 3:02 pm | MODERATE | 30.8 | MODERATE | 0.1.0-dev |
| 10 Nov 2026, 11:42 am | MODERATE | 30.8 | MODERATE | 0.1.0-dev |
| 10 Nov 2026, 11:06 am | MODERATE | 30.8 | MODERATE | 0.1.0-dev |
| 9 Nov 2026, 6:49 pm | MODERATE | 30.7 | MODERATE | 0.1.0-dev |
| 9 Nov 2026, 2:02 pm | MODERATE | 30.7 | MODERATE | 0.1.0-dev |
| 9 Nov 2026, 7:53 am | MODERATE | 40.9 | MODERATE | 0.1.0-dev |
| 9 Nov 2026, 4:54 am | MODERATE | 40.9 | MODERATE | 0.1.0-dev |
| 9 Nov 2026, 2:23 am | MODERATE | 47.3 | MODERATE | 0.1.0-dev |
| 8 Nov 2026, 9:29 pm | MODERATE | 47.3 | MODERATE | 0.1.0-dev |
| 8 Nov 2026, 6:54 pm | MODERATE | 47.3 | MODERATE | 0.1.0-dev |
| 8 Nov 2026, 4:57 pm | MODERATE | 47.5 | MODERATE | 0.1.0-dev |
| 8 Nov 2026, 12:24 pm | MODERATE | 47.5 | MODERATE | 0.1.0-dev |
| 8 Nov 2026, 7:15 am | MODERATE | 47.3 | MODERATE | 0.1.0-dev |
| 7 Nov 2026, 5:43 pm | MODERATE | 47.3 | MODERATE | 0.1.0-dev |
Evidence hierarchy
- Direct recent detection — Tagged receiver, verified instrument detection, or equivalent in the relevant window.
- Verified sighting — Sighting confirmed by a responsible authority or trained observer.
- Multiple corroborated observations — Independent reports that agree in space and time.
- Strong ecological proxy — Prey aggregation, carcass, or similar with documented association — still a proxy.
- Environmental habitat suitability — Temperature, depth, and similar suitability — not presence.
- Historical seasonal association — Climatology / phenology prior. Not a live observation.
- Long-term background prevalence — Baseline occurrence in the region. Weakest for now-casting.
Methodology
Relative interaction risk, not attack probability. Official advice outranks this page. Methodology · Data sources