{"url_path":"/weather/alerts/2.49.0.1.840.0.09f968a7e433934777e7b69d6e9f558543c21fd7.001.1","section_key":"alert","section_title":"Special Marine Warning issued July 20 at 5:45PM CDT until July 20 at 6:45PM CDT by NWS New Orleans LA","topic":"weather","document":{"doc_type":"alert","doc_date":"2026-07-20","source_url":"https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.09f968a7e433934777e7b69d6e9f558543c21fd7.001.1","accession_number":null,"cik":null,"ticker":null,"issuer_name":null,"edgar_url":null,"primary_entity_key":null,"primary_entity_name":"NWS New Orleans LA"},"word_count":276,"has_tables":false,"body_markdown":"# Special Marine Warning: Special Marine Warning issued July 20 at 5:45PM CDT until July 20 at 6:45PM CDT by NWS New Orleans LA\n\n**Severity:** Severe\n**Certainty:** Likely\n**Urgency:** Immediate\n**Areas:** Terrebonne Bay; Coastal Waters from Port Fourchon LA to Lower Atchafalaya River LA out 20 nm; Coastal waters from Port Fourchon Louisiana to Lower Atchafalaya River LA from 20 to 60 NM\n**Issued by:** NWS New Orleans LA\n**Sent:** 2026-07-20T17:45:00-05:00\n**Effective:** 2026-07-20T17:45:00-05:00\n**Expires:** 2026-07-20T18:45:00-05:00\n\n## Description\nSMWLIX\n\nThe National Weather Service in New Orleans has issued a\n\n* Special Marine Warning for...\nCoastal Waters from Port Fourchon LA to Lower Atchafalaya River LA\nout 20 nm...\nCoastal waters from Port Fourchon Louisiana to Lower Atchafalaya\nRiver LA from 20 to 60 NM...\nTerrebonne Bay...\n\n* Until 645 PM CDT.\n\n* At 545 PM CDT, a cluster of severe thunderstorms capable of\nproducing waterspouts was located along a line extending from 6 nm\nsoutheast of Dulac to 16 nm southwest of Timbalier Island, moving\nsouth at 10 knots.\n\nHAZARD...Waterspouts, wind gusts to 40 knots, and small hail.\n\nSOURCE...Radar.\n\nIMPACT...Waterspouts can quickly form and capsize boats...damage\nvessels and oil rigs...and create suddenly higher waves.\nSmall craft could be damaged in briefly higher winds and\nsuddenly higher waves.\n\n* Locations impacted include...\nTerrebonne Bay, Isle Derniers, and Timbalier Island.\n\n## Instructions\nStrong winds will be dangerous for boaters or anyone near the water.\nBoaters should avoid waterspouts and never try to navigate near them.\nMake sure all on board are wearing life jackets. Seek shelter or move\nto safe harbor until hazardous weather passes.\n\nFrequent lightning is occurring with these storms. If caught on the\nopen water stay below deck if possible, keep away from ungrounded\nmetal objects."}