{"url_path":"/weather/alerts/2.49.0.1.840.0.a496ccc6c0ac15a787a550fc367dab9de631aa4e.002.1","section_key":"alert","section_title":"Frost Advisory issued May 19 at 11:46AM MDT until May 20 at 8:00AM MDT by NWS Rapid City SD","topic":"weather","document":{"doc_type":"alert","doc_date":"2026-05-19","source_url":"https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.a496ccc6c0ac15a787a550fc367dab9de631aa4e.002.1","accession_number":null,"cik":null,"ticker":null,"issuer_name":null,"edgar_url":null,"primary_entity_key":null,"primary_entity_name":"NWS Rapid City SD"},"word_count":141,"has_tables":false,"body_markdown":"# Frost Advisory: Frost Advisory issued May 19 at 11:46AM MDT until May 20 at 8:00AM MDT by NWS Rapid City SD\n\n**Severity:** Minor\n**Certainty:** Likely\n**Urgency:** Expected\n**Areas:** Northern Perkins; Butte; Northern Meade Co Plains; Ziebach; Southern Foothills; Custer Co Plains; Pennington Co Plains; Haakon; Western Fall River; Northern Oglala Lakota; Northern Jackson; Bennett; Mellette; Todd; Tripp; Southern Meade Co Plains; Eastern Fall River; Southern Oglala Lakota; Southern Jackson; Southern Perkins\n**Issued by:** NWS Rapid City SD\n**Sent:** 2026-05-19T11:46:00-06:00\n**Effective:** 2026-05-19T11:46:00-06:00\n**Expires:** 2026-05-20T03:00:00-06:00\n\n## Description\n* WHAT...Temperatures as low as 33 may result in frost formation.\n\n* WHERE...Portions of northwestern, south central, and southwestern\nSouth Dakota.\n\n* WHEN...From midnight MDT /1 AM CDT/ tonight to 8 AM MDT /9 AM CDT/\nWednesday.\n\n* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive\noutdoor plants may be killed if left uncovered.\n\n## Instructions\nTake steps now to protect tender plants from the cold."}