{"url_path":"/weather/alerts/2.49.0.1.840.0.c4697f6a33e133f80b4ed71f28e56becbf43c778.001.1","section_key":"alert","section_title":"Flash Flood Warning issued May 18 at 5:06PM CDT until May 18 at 9:00PM CDT by NWS St Louis MO","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.c4697f6a33e133f80b4ed71f28e56becbf43c778.001.1","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":289,"has_tables":false,"body_markdown":"# Flash Flood Warning: Flash Flood Warning issued May 18 at 5:06PM CDT until May 18 at 9:00PM CDT by NWS St Louis MO\n\n**Severity:** Severe\n**Certainty:** Likely\n**Urgency:** Immediate\n**Areas:** Clinton, IL; Madison, IL; Monroe, IL; St. Clair, IL; Jefferson, MO; St. Louis, MO; St. Louis City, MO\n**Issued by:** NWS St Louis MO\n**Sent:** 2026-05-18T17:06:00-05:00\n**Effective:** 2026-05-18T17:06:00-05:00\n**Expires:** 2026-05-18T21:00:00-05:00\n\n## Description\nFFWLSX\n\nThe National Weather Service in St Louis has issued a\n\n* Flash Flood Warning for...\nWestern Clinton County in south central Illinois...\nSouthern Madison County in southwestern Illinois...\nNorthwestern Monroe County in southwestern Illinois...\nSaint Clair County in southwestern Illinois...\nNortheastern Jefferson County in east central Missouri...\nEastern Saint Louis County in east central Missouri...\nEast Central Saint Louis City in east central Missouri...\n\n* Until 900 PM CDT.\n\n* At 506 PM CDT, Doppler radar indicated thunderstorms producing\nheavy rain across the warned area. Between 1 and 2 inches of rain\nhave fallen. Additional rainfall amounts of 1 to 2 inches are\npossible in the warned area. Flash flooding is ongoing or expected\nto begin shortly.\n\nHAZARD...Flash flooding caused by thunderstorms.\n\nSOURCE...Radar indicated.\n\nIMPACT...Flash flooding of small creeks and streams, urban areas,\nhighways, streets and underpasses as well as other poor\ndrainage and low-lying areas.\n\n* Some locations that will experience flash flooding include...\nBelleville, Granite City, O'Fallon, East St. Louis, Collinsville,\nEdwardsville, Fairview Heights, Cahokia, Swansea, Glen Carbon,\nShiloh, Highland, Troy, Waterloo, Columbia, Maryville, Mascoutah,\nPontoon Beach and Centreville.\n\nThis includes the following State Parks...\nFrank Holten State Park and Horseshoe Lake State Park.\n\nThis includes the following highways...\nInterstate 64 in Illinois between exits 9 and 27. Interstate 70 in\nIllinois between exits 21 and 30.\n\n## Instructions\nTurn around, don't drown when encountering flooded roads. Most flood\ndeaths occur in vehicles."}