[{"data":1,"prerenderedAt":185},["ShallowReactive",2],{"leaderboard-total":3,"spot-the-sisters":9,"spot-seo-the-sisters":150},{"entries":4,"total":5,"period":6,"type":7,"generated_at":8},[],0,"all_time","reports","2026-10-02T06:59:37.379659Z",{"id":10,"name":11,"slug":12,"latitude":13,"longitude":14,"description":15,"difficulty":16,"image_url":17,"status":18,"tide_constituents":19,"hazard_entries":70,"access_info_structured":84,"area_boundary":17,"routes":17,"created_at":92,"updated_at":93,"today_conditions":94,"today_verdict_view":117,"images":145,"submitted_by":146,"region_name":148,"verification_status":149,"verified_at":17,"disputed":107,"verifier_count":5,"last_verified_display_name":17},"ba85524c-a356-4102-87a3-1be6bc717641","The Sisters","the-sisters",-32.325,115.575,"The Sisters is a striking limestone reef formation in Shoalwater Islands Marine Park, off Rockingham's coast in Perth's south. Named for the cluster of rocks that break the surface, this cavernous reef system offers otherworldly snorkelling through underwater nooks, swim-throughs, and rocky channels teeming with marine life. The reef's varying depths — averaging 7 metres — and its proximity to open ocean make it best tackled on calm days when the Indian Ocean settles. As part of a protected marine park, the waters here are pristine, drawing snorkellers looking for an adventurous reef exploration beyond the usual beach-entry spots.","intermediate",null,"published",{"name":20,"amplitude":36,"phase":52,"latitude":13,"model":68,"epoch":69},[21,22,23,24,25,26,27,28,29,30,31,32,33,34,35],"2N2","J1","K1","K2","M2","M4","MF","MM","N2","O1","P1","Q1","S1","S2","T2",[37,38,39,40,41,42,43,44,45,46,47,48,49,50,51],0.004199503336153558,0.009029909641352493,0.16751913718190795,0.014791829327926236,0.05219102829131892,0.004296215206772267,0.004076429572993602,0.00474476886146048,0.014103284637497833,0.12151463632316606,0.05149716088199529,0.023756482513291204,0.01239091897590325,0.041313942694605664,0.0025241949559766893,[53,54,55,56,57,58,59,60,61,62,63,64,65,66,67],58.25419476405305,223.37930817974606,181.29430663143833,34.05110067145227,56.99979204518856,142.95123813918846,27.920723128732355,233.59675493928526,109.34808026802135,175.425805757435,171.36823281205437,172.53054389867037,323.1567121214905,61.05407448192694,253.84027061665208,"EOT20","1992-01-01T00:00:00Z",[71,77,81],{"name":72,"description":73,"severity":74,"season_start":75,"season_end":76},"Strong swells and ocean surges","Exposed reef location can experience significant swell, especially in south-westerly winds or during winter storms. Calm conditions essential.","warning",5,9,{"name":78,"description":79,"severity":80,"season_start":17,"season_end":17},"Boat traffic","Located within Shoalwater Islands Marine Park where recreational and charter vessels operate. Snorkellers should stay aware and surface carefully.","caution",{"name":82,"description":83,"severity":80,"season_start":17,"season_end":17},"Sharp limestone reef","Cavernous limestone reef formations have sharp edges. Cuts and scrapes possible when navigating swim-throughs and rocky channels.",{"directions":85,"parking":86,"facilities":87,"fees":90,"access_method":91},"The Sisters reef is located offshore in Shoalwater Islands Marine Park, approximately 45 minutes south of Perth. Best accessed via a kayak or boat launch from Mersey Point, Point Peron, or Rockingham Beach. Several local dive and snorkel charter operators run trips to the reef from Rockingham.","Parking available at Mersey Point carpark, Point Peron carpark, and Rockingham Beach foreshore.",[88,89],"parking","toilets","No entry fee for the marine park, but charter tours have fees. Boat launch fees may apply at some ramps.","boat","2026-07-27T02:58:34.172045Z","2026-08-04T05:36:16.070413Z",{"verdict":95,"evaluated_at":96,"models":97},"marginal","2026-10-02T02:25:18.152852Z",[98,105,111],{"model_name":99,"is_favourable":100,"value":101,"threshold":102,"unit":103,"operator":104},"Wind Speed",true,3.45,10,"kn","lte",{"model_name":106,"is_favourable":107,"value":108,"threshold":109,"unit":110,"operator":104},"Wave Height",false,1.19,0.5,"m",{"model_name":112,"is_favourable":107,"value":113,"threshold":114,"unit":115,"operator":116},"Visibility",1.65,2,"","gte",{"verdict":95,"rating":118,"evaluated_at":96,"generated_at":96,"source":119,"confidence":120,"visibility":123,"parameters":124,"models_passed":126,"models_total":75},"Fair","precomputed",{"level":121,"value":122},"High",92.5,{"score":113,"rating":17,"confidence":17},[125,127,133,137,142],{"name":106,"value":108,"label":17,"unit":110,"favourable":107,"score":5,"optimal_max":109,"marginal_max":126},1,{"name":128,"value":129,"label":17,"unit":130,"favourable":107,"score":126,"optimal_max":131,"marginal_max":132},"Swell Period",10.45,"s",8,12,{"name":99,"value":134,"label":17,"unit":103,"favourable":100,"score":135,"optimal_max":102,"marginal_max":136},3.450316,3,15,{"name":138,"value":139,"label":17,"unit":140,"favourable":107,"score":126,"optimal_max":75,"marginal_max":141},"Precipitation",5.4,"mm",20,{"name":143,"value":17,"label":144,"unit":115,"favourable":107,"score":126,"optimal_max":17,"marginal_max":17},"Tidal Phase","ebb",[],{"display_name":147},"Daniel","Western Australia","unverified",{"title":151,"description":152,"canonical_url":153,"og_image":154,"structured_data":155,"breadcrumbs":178},"Snorkeling Conditions at The Sisters - How's the Spot","Check snorkeling conditions at The Sisters, Western Australia. Fair conditions, water 18.1°C, waves 1.19m","https:\u002F\u002Fhowsthespot.com\u002Fspots\u002Fthe-sisters","https:\u002F\u002Fhowsthespot.com\u002Fog-default.png",[156,165],{"@context":157,"@type":158,"name":11,"description":159,"url":153,"geo":160,"address":162},"https:\u002F\u002Fschema.org","Place","The Sisters is a striking limestone reef formation in Shoalwater Islands Marine Park, off Rockingham's coast in Perth's south. Named for the cluster of rocks that break the surface, this cavernous...",{"@type":161,"latitude":13,"longitude":14},"GeoCoordinates",{"@type":163,"addressRegion":148,"addressCountry":164},"PostalAddress","Australia",{"@context":157,"@type":166,"name":167,"description":152,"url":153,"breadcrumb":168},"WebPage","Snorkeling Conditions at The Sisters",{"@context":157,"@type":169,"itemListElement":170},"BreadcrumbList",[171,175,177],{"@type":172,"position":126,"name":173,"item":174},"ListItem","Home","https:\u002F\u002Fhowsthespot.com",{"@type":172,"position":114,"name":148,"item":176},"https:\u002F\u002Fhowsthespot.com\u002Fexplore?region=western-australia",{"@type":172,"position":135,"name":11,"item":153},[179,181,183],{"label":173,"href":180},"\u002F",{"label":148,"href":182},"\u002Fexplore?region=western-australia",{"label":11,"href":184},"\u002Fspots\u002Fthe-sisters",1790924511856]