{"url_path":"/weather/alerts/2.49.0.1.840.0.83c3c15b48faa08053db6943dad6c1ba75f79bc1.001.1","section_key":"alert","section_title":"Heat Advisory issued September 16 at 11:29AM CDT until September 18 at 8:00PM CDT by NWS St Louis MO","topic":"weather","document":{"doc_type":"alert","doc_date":"2026-09-16","source_url":"https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.83c3c15b48faa08053db6943dad6c1ba75f79bc1.001.1","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":216,"has_tables":false,"body_markdown":"# Heat Advisory: Heat Advisory issued September 16 at 11:29AM CDT until September 18 at 8:00PM CDT by NWS St Louis MO\n\n**Severity:** Moderate\n**Certainty:** Likely\n**Urgency:** Expected\n**Areas:** Greene; Macoupin; Montgomery; Fayette; Calhoun; Jersey; Boone; Callaway; Montgomery; Lincoln\n**Issued by:** NWS St Louis MO\n**Sent:** 2026-09-16T11:29:00-05:00\n**Effective:** 2026-09-16T11:29:00-05:00\n**Expires:** 2026-09-17T02:30:00-05:00\n\n## Description\n* WHAT...Heat index values up to 105.\n\n* WHERE...In Illinois, Fayette IL, Montgomery IL, Calhoun IL, Greene\nIL, Jersey IL, and Macoupin IL Counties. In Missouri, Boone MO,\nCallaway MO, Lincoln MO, and Montgomery MO Counties.\n\n* WHEN...Until 8 PM CDT Friday.\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. Young children and\npets should never be left unattended in vehicles under any\ncircumstances. Take extra precautions if you work or spend time\noutside. When possible reschedule strenuous activities to early\nmorning or evening. Know the signs and symptoms of heat exhaustion\nand heat stroke. Wear lightweight and loose fitting clothing when\npossible. To reduce risk during outdoor work, the Occupational Safety\nand Health Administration recommends scheduling frequent rest breaks\nin shaded or air conditioned environments. Anyone overcome by heat\nshould be moved to a cool and shaded location. Heat stroke is an\nemergency! Call 9 1 1."}