{"url_path":"/weather/alerts/2.49.0.1.840.0.6c90d104aec59196f67595d4e5abe02eafee9263.007.1","section_key":"alert","section_title":"Dense Fog Advisory issued May 18 at 3:35PM EDT until May 19 at 11:00AM EDT by NWS Marquette MI","topic":"weather","document":{"doc_type":"alert","doc_date":"2026-05-18","source_url":"https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.6c90d104aec59196f67595d4e5abe02eafee9263.007.1","accession_number":null,"cik":null,"ticker":null,"issuer_name":null,"edgar_url":null,"primary_entity_key":null,"primary_entity_name":"NWS Marquette MI"},"word_count":214,"has_tables":false,"body_markdown":"# Dense Fog Advisory: Dense Fog Advisory issued May 18 at 3:35PM EDT until May 19 at 11:00AM EDT by NWS Marquette MI\n\n**Severity:** Minor\n**Certainty:** Likely\n**Urgency:** Expected\n**Areas:** Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border; Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore; Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore\n**Issued by:** NWS Marquette MI\n**Sent:** 2026-05-18T15:35:00-04:00\n**Effective:** 2026-05-18T15:35:00-04:00\n**Expires:** 2026-05-19T03:45:00-04:00\n\n## Description\n* WHAT...Dense fog will reduce visibility to less than one\nnautical mile.\n\n* WHERE...Lake Superior from Upper Entrance to Portage Canal to\nManitou Island MI 5NM off shore to the US/Canadian Border,\nLake Superior West of Line from Manitou Island to Marquette MI\nBeyond 5NM from shore and Lake Superior East of a line from\nManitou Island to Marquette MI and West of a line from Grand\nMarais MI to the US/Canadian Border Beyond 5NM from shore.\n\n* WHEN...Until 11 AM EDT Tuesday.\n\n* IMPACTS...Low visibility will make navigation difficult.\n\n## Instructions\nIf you must navigate, proceed with caution. Use proper fog\nsignals. Make sure all running lights are on. Remember to use\nyour radar and compass."}