{"url_path":"/weather/alerts/2.49.0.1.840.0.9b67250488079e3d386696bf387cc3c2ff7aea48.003.1","section_key":"alert","section_title":"Heat Advisory issued July 20 at 8:00AM CDT until July 20 at 8:00PM CDT by NWS Sioux Falls SD","topic":"weather","document":{"doc_type":"alert","doc_date":"2026-07-20","source_url":"https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.9b67250488079e3d386696bf387cc3c2ff7aea48.003.1","accession_number":null,"cik":null,"ticker":null,"issuer_name":null,"edgar_url":null,"primary_entity_key":null,"primary_entity_name":"NWS Sioux Falls SD"},"word_count":180,"has_tables":false,"body_markdown":"# Heat Advisory: Heat Advisory issued July 20 at 8:00AM CDT until July 20 at 8:00PM CDT by NWS Sioux Falls SD\n\n**Severity:** Moderate\n**Certainty:** Likely\n**Urgency:** Expected\n**Areas:** Lyon; Osceola; Dickinson; Sioux; O'Brien; Clay; Gregory; Charles Mix; Douglas; Hutchinson; Turner; Lincoln; Bon Homme; Yankton\n**Issued by:** NWS Sioux Falls SD\n**Sent:** 2026-07-20T08:00:00-05:00\n**Effective:** 2026-07-20T08:00:00-05:00\n**Expires:** 2026-07-20T18:00:00-05:00\n\n## Description\n* WHAT...Heat index values up to 104 expected.\n\n* WHERE...Portions of northwest Iowa and south central and southeast\nSouth Dakota.\n\n* WHEN...From 11 AM this morning to 8 PM CDT this evening.\n\n* IMPACTS...Hot temperatures and high humidity may cause heat\nillnesses.\n\n## Instructions\nDo not leave young children and pets in unattended vehicles. Car\ninteriors will reach lethal temperatures in a matter of minutes.\n\nDrink plenty of fluids, stay in an air-conditioned room, stay out of\nthe sun, and check up on relatives and neighbors.\n\nTo reduce risk during outdoor work, the Occupational Safety and\nHealth Administration recommends scheduling frequent rest breaks in\nshaded 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."}