{"url_path":"/weather/alerts/2.49.0.1.840.0.af8d97f71d1af75a17e6bc2ed372877c0b7d01ae.001.1","section_key":"alert","section_title":"Hydrologic Outlook issued September 18 at 10:20AM MDT by NWS Riverton WY","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.af8d97f71d1af75a17e6bc2ed372877c0b7d01ae.001.1","accession_number":null,"cik":null,"ticker":null,"issuer_name":null,"edgar_url":null,"primary_entity_key":null,"primary_entity_name":"NWS Riverton WY"},"word_count":148,"has_tables":false,"body_markdown":"# Hydrologic Outlook: Hydrologic Outlook issued September 18 at 10:20AM MDT by NWS Riverton WY\n\n**Severity:** Unknown\n**Certainty:** Possible\n**Urgency:** Future\n**Areas:** Big Horn, WY; Fremont, WY; Hot Springs, WY; Johnson, WY; Lincoln, WY; Natrona, WY; Park, WY; Sublette, WY; Sweetwater, WY; Teton, WY; Washakie, WY\n**Issued by:** NWS Riverton WY\n**Sent:** 2026-09-18T10:20:00-06:00\n**Effective:** 2026-09-18T10:20:00-06:00\n**Expires:** 2026-09-19T12:00:00-06:00\n\n## Description\nESFRIW\n\nA wet weather system will support periods of showers and\nthunderstorms across Wyoming Friday, Saturday, and Sunday. This\nweather system is funneling abundant tropical moisture into the\nstate. Given this anomalously high moisture, many thunderstorms will\nfeature heavy rainfall, possibly leading to localized flooding. Poor\ndrainage areas, urban areas, and steep terrain will be the most\nsusceptible locations for this isolated flooding.\n\nMany locations could see rainfall totals anywhere between 0.75\" to\n1.75\" through Sunday afternoon, with a majority of this rain falling\nquickly in thunderstorms.\n\nRemember, if you encounter a flooded roadway, turn around don't down!"}