[{"data":1,"prerenderedAt":209},["ShallowReactive",2],{"leaderboard-total":3,"spot-seo-julia-percy-island-discovery-coast":9,"spot-julia-percy-island-discovery-coast":51},{"entries":4,"total":5,"period":6,"type":7,"generated_at":8},[],0,"all_time","reports","2026-10-03T06:32:05.526386Z",{"title":10,"description":11,"canonical_url":12,"og_image":13,"structured_data":14,"breadcrumbs":44},"Snorkeling Conditions at Julia Percy Island (Discovery Coast) - How's the Spot","Check snorkeling conditions at Julia Percy Island (Discovery Coast), Victoria. Hazardous conditions, water 14.9°C, waves 2.50m","https:\u002F\u002Fhowsthespot.com\u002Fspots\u002Fjulia-percy-island-discovery-coast","https:\u002F\u002Fhowsthespot.syd1.cdn.digitaloceanspaces.com\u002Fspots\u002Fimport_julia-percy-island-discovery-coast_0_0b4c8b9bc3cb.jpg",[15,28],{"@context":16,"@type":17,"name":18,"description":19,"url":12,"geo":20,"address":24},"https:\u002F\u002Fschema.org","Place","Julia Percy Island (Discovery Coast)","Julia Percy Island (known traditionally as Deen Maar) is Australia's only offshore volcano and the largest basalt island off western Victoria's Discovery Coast. This wild, windswept island rises dr...",{"@type":21,"latitude":22,"longitude":23},"GeoCoordinates",-38.416071,142.003766,{"@type":25,"addressRegion":26,"addressCountry":27},"PostalAddress","Victoria","Australia",{"@context":16,"@type":29,"name":30,"description":11,"url":12,"breadcrumb":31},"WebPage","Snorkeling Conditions at Julia Percy Island (Discovery Coast)",{"@context":16,"@type":32,"itemListElement":33},"BreadcrumbList",[34,39,42],{"@type":35,"position":36,"name":37,"item":38},"ListItem",1,"Home","https:\u002F\u002Fhowsthespot.com",{"@type":35,"position":40,"name":26,"item":41},2,"https:\u002F\u002Fhowsthespot.com\u002Fexplore?region=victoria",{"@type":35,"position":43,"name":18,"item":12},3,[45,47,49],{"label":37,"href":46},"\u002F",{"label":26,"href":48},"\u002Fexplore?region=victoria",{"label":18,"href":50},"\u002Fspots\u002Fjulia-percy-island-discovery-coast",{"id":52,"name":18,"slug":53,"latitude":22,"longitude":23,"description":54,"difficulty":55,"image_url":13,"status":56,"tide_constituents":57,"hazard_entries":108,"access_info_structured":132,"area_boundary":119,"routes":119,"created_at":139,"updated_at":140,"today_conditions":141,"today_verdict_view":162,"images":188,"submitted_by":206,"region_name":26,"verification_status":208,"verified_at":119,"disputed":153,"verifier_count":5,"last_verified_display_name":119},"5ed5da24-0730-45f4-97ba-0a6bf651d5dd","julia-percy-island-discovery-coast","Julia Percy Island (known traditionally as Deen Maar) is Australia's only offshore volcano and the largest basalt island off western Victoria's Discovery Coast. This wild, windswept island rises dramatically from the Southern Ocean, surrounded by deep reefs, surge channels, and caves carved into ancient lava flows. The waters teem with marine life thanks to the island's isolation and protected status — one of Australia's largest fur seal colonies (over 27,000 Australian fur seals) surrounds the island, while the underwater topography features dramatic drop-offs, overhangs, and the famous 'Blowhole' cave at Thunder Point. Snorkeling here is for experienced adventurers only, requiring calm conditions and boat access.","advanced","published",{"name":58,"amplitude":74,"phase":90,"latitude":22,"model":106,"epoch":107},[59,60,61,62,63,64,65,66,67,68,69,70,71,72,73],"2N2","J1","K1","K2","M2","M4","MF","MM","N2","O1","P1","Q1","S1","S2","T2",[75,76,77,78,79,80,81,82,83,84,85,86,87,88,89],0.003802871096663876,0.010413812804651862,0.1767431470781165,0.038962878136952005,0.13014800328973772,0.0037835946817970805,0.005097298217355835,0.005336492163631262,0.009528811615418136,0.1297295551778061,0.05436882518969233,0.03331470279174859,0.011608362019040764,0.13765045396382275,0.012389386392156749,[91,92,93,94,95,96,97,98,99,100,101,102,103,104,105],155.8435649617835,280.97711866534945,256.5347807071285,115.77471897752253,42.75259116024236,115.02229155231616,171.11273804819973,246.99553371612353,294.1100398374652,237.88053928887075,250.58120919358544,223.76220677166975,9.516030563897859,113.48235013236194,122.15831573259318,"EOT20","1992-01-01T00:00:00Z",[109,115,120,123,126],{"name":110,"description":111,"severity":112,"season_start":113,"season_end":114},"Surge and Swell","Exposed Southern Ocean location means large swells and powerful surge conditions, especially around the Blowhole cave. Only diveable in flat, calm conditions.","danger",6,8,{"name":116,"description":117,"severity":118,"season_start":119,"season_end":119},"Strong Ocean Currents","Unpredictable currents sweep around the island's basalt cliffs and reef systems. Can change rapidly with tide and weather.","warning",null,{"name":121,"description":122,"severity":118,"season_start":119,"season_end":119},"Remote Location","Island is 19 km offshore with no facilities, shelter, or emergency services. Self-reliance is critical.",{"name":124,"description":125,"severity":118,"season_start":119,"season_end":119},"Deep Holes and Irregular Reef","The surrounding reefs at The Crags access point are irregular with deep holes and permanent rips running through gaps in the reef.",{"name":127,"description":128,"severity":129,"season_start":130,"season_end":131},"Cold Water Temperatures","Southern Ocean water temperatures are very cold year-round (10-16°C), requiring thick wetsuits and increasing hypothermia risk on long snorkels.","caution",5,10,{"directions":133,"parking":134,"facilities":135,"fees":137,"access_method":138},"Located approximately 19 km offshore from The Crags, west of Port Fairy on Victoria's Discovery Coast. Access is by private or charter boat only — no ferry service. Charter tours depart from Port Fairy or nearby coastal towns.","Parking available at The Crags Coastal Reserve car park (end of The Crags Road, off Princes Highway\u002FA1).",[136],"parking","No on-site fees. Charter boat tours cost approximately $100–$200 per person.","boat","2026-07-27T02:57:52.794036Z","2026-08-04T05:32:31.002680Z",{"verdict":142,"evaluated_at":143,"models":144},"no_go","2026-10-03T02:17:15.293787Z",[145,151,157],{"model_name":146,"is_favourable":147,"value":148,"threshold":131,"unit":149,"operator":150},"Wind Speed",true,2.31,"kn","lte",{"model_name":152,"is_favourable":153,"value":154,"threshold":155,"unit":156,"operator":150},"Wave Height",false,2.495,0.5,"m",{"model_name":158,"is_favourable":153,"value":159,"threshold":40,"unit":160,"operator":161},"Visibility",0.99,"","gte",{"verdict":142,"rating":163,"evaluated_at":143,"generated_at":143,"source":164,"confidence":165,"visibility":168,"parameters":169,"models_passed":40,"models_total":130},"Hazardous","precomputed",{"level":166,"value":167},"High",100,{"score":159,"rating":119,"confidence":119},[170,172,177,180,185],{"name":152,"value":171,"label":119,"unit":156,"favourable":153,"score":5,"optimal_max":155,"marginal_max":36},2.4953563879685268,{"name":173,"value":174,"label":119,"unit":175,"favourable":153,"score":36,"optimal_max":114,"marginal_max":176},"Swell Period",10.55,"s",12,{"name":146,"value":178,"label":119,"unit":149,"favourable":147,"score":43,"optimal_max":131,"marginal_max":179},2.3131696,15,{"name":181,"value":182,"label":119,"unit":183,"favourable":153,"score":5,"optimal_max":130,"marginal_max":184},"Precipitation",32.2,"mm",20,{"name":186,"value":119,"label":187,"unit":160,"favourable":147,"score":43,"optimal_max":119,"marginal_max":119},"Tidal Phase","slack",[189,196,203],{"id":190,"image_url":13,"sort_order":5,"is_primary":147,"moderation_status":191,"license":192,"license_url":193,"attribution":194,"author_name":195},"937a0c75-cba9-4c8a-8e35-9d28779393d6","approved","CC BY 2.0","https:\u002F\u002Fcreativecommons.org\u002Flicenses\u002Fby\u002F2.0\u002F","Photo by Ed Dunens","Ed Dunens",{"id":197,"image_url":198,"sort_order":36,"is_primary":153,"moderation_status":191,"license":199,"license_url":200,"attribution":201,"author_name":202},"5e31211b-58f2-4580-a76c-2458c22b690b","https:\u002F\u002Fhowsthespot.syd1.cdn.digitaloceanspaces.com\u002Fspots\u002Fimport_julia-percy-island-discovery-coast_1_54f5a200bd89.jpg","CC BY 3.0","https:\u002F\u002Fcreativecommons.org\u002Flicenses\u002Fby\u002F3.0\u002F","Photo by Mattinbgn ( talk · contribs )","Mattinbgn",{"id":204,"image_url":205,"sort_order":40,"is_primary":153,"moderation_status":191,"license":192,"license_url":193,"attribution":194,"author_name":195},"19e02c15-2bff-42b3-8f8b-51e393c67d94","https:\u002F\u002Fhowsthespot.syd1.cdn.digitaloceanspaces.com\u002Fspots\u002Fimport_julia-percy-island-discovery-coast_2_0f16a0e79411.jpg",{"display_name":207},"Daniel","unverified",1791009163423]