{"url_path":"/weather/alerts/2.49.0.1.840.0.6a14db25b9252b3576a3f1faedb67b5d6c28c5c5.002.1","section_key":"alert","section_title":"Heat Advisory issued September 18 at 2:00PM CDT until September 19 at 8:00PM CDT by NWS St Louis MO","topic":"weather","document":{"doc_type":"alert","doc_date":"2026-09-18","source_url":"https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.6a14db25b9252b3576a3f1faedb67b5d6c28c5c5.002.1","accession_number":null,"cik":null,"ticker":null,"issuer_name":null,"edgar_url":null,"primary_entity_key":null,"primary_entity_name":"NWS St Louis MO"},"word_count":126,"has_tables":false,"body_markdown":"# Heat Advisory: Heat Advisory issued September 18 at 2:00PM CDT until September 19 at 8:00PM CDT by NWS St Louis MO\n\n**Severity:** Moderate\n**Certainty:** Likely\n**Urgency:** Expected\n**Areas:** Bond; Clinton; Marion; Washington; Randolph; Madison; St. Clair; Monroe; Moniteau; Cole; Osage; Gasconade; Warren; St. Charles; Franklin; St. Louis; St. Louis City; Jefferson; Crawford; Washington; St. Francois; Ste. Genevieve; Iron; Madison; Reynolds\n**Issued by:** NWS St Louis MO\n**Sent:** 2026-09-18T14:00:00-05:00\n**Effective:** 2026-09-18T14:00:00-05:00\n**Expires:** 2026-09-19T05:00:00-05:00\n\n## Description\n* WHAT...Heat index values up to 105.\n\n* WHERE...Portions of south central and southwest Illinois and\ncentral, east central, and southeast Missouri.\n\n* WHEN...Until 8 PM CDT Saturday.\n\n* IMPACTS...Hot temperatures and high humidity may cause heat\nillnesses.\n\n## Instructions\nDrink plenty of fluids, stay in an air-conditioned room, stay out of\nthe sun, and check up on relatives and neighbors."}