{"url_path":"/weather/alerts/2.49.0.1.840.0.ffddfaca4378a4d487d77a2caed257c190c3fcac.001.1","section_key":"alert","section_title":"Special Marine Warning issued June 20 at 6:57PM EDT until June 20 at 8:00PM EDT by NWS Jacksonville FL","topic":"weather","document":{"doc_type":"alert","doc_date":"2026-06-20","source_url":"https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.ffddfaca4378a4d487d77a2caed257c190c3fcac.001.1","accession_number":null,"cik":null,"ticker":null,"issuer_name":null,"edgar_url":null,"primary_entity_key":null,"primary_entity_name":"NWS Jacksonville FL"},"word_count":209,"has_tables":false,"body_markdown":"# Special Marine Warning: Special Marine Warning issued June 20 at 6:57PM EDT until June 20 at 8:00PM EDT by NWS Jacksonville FL\n\n**Severity:** Severe\n**Certainty:** Likely\n**Urgency:** Immediate\n**Areas:** Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM\n**Issued by:** NWS Jacksonville FL\n**Sent:** 2026-06-20T18:57:00-04:00\n**Effective:** 2026-06-20T18:57:00-04:00\n**Expires:** 2026-06-20T20:00:00-04:00\n\n## Description\nSMWJAX\n\nThe National Weather Service in Jacksonville has issued a\n\n* Special Marine Warning for...\nCoastal waters from Fernandina Beach to St. Augustine FL out 20\nNM...\n\n* Until 800 PM EDT.\n\n* At 657 PM EDT, strong thunderstorms were located along a line\nextending from 9 nm west of Amelia City to Mayport, moving east at\n15 knots.\n\nHAZARD...Wind gusts 34 knots or greater.\n\nSOURCE...Radar.\n\nIMPACT...Small craft could be damaged in briefly higher winds and\nsuddenly higher waves.\n\n* Locations impacted include...\nAtlantic Beach, Mayport, Talbot Island, Nassau Sound Approach Buoy\n6a, Saint Johns Lighted Buoy, Amelia City, Whittakers Snapper Hole\nReef, and Jacksonville Beach.\n\n## Instructions\nMove to safe harbor until hazardous weather passes. If your vessel is\ncaught offshore, immediately secure for heavy weather. Ensure all\ncrew members are wearing USCG approved Type I life jackets and\nnonessential crew are below decks. Deploy jack lines and harnesses if\navailable. Check life saving equipment, including batteries on\nhandheld radios, for readiness."}