{"url_path":"/weather/alerts/2.49.0.1.840.0.a1be87eaf8a05987e6679fd304c1dd91b86c9a42.001.1","section_key":"alert","section_title":"Frost Advisory issued May 18 at 12:00PM MDT until May 19 at 9:00AM MDT by NWS Missoula MT","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.a1be87eaf8a05987e6679fd304c1dd91b86c9a42.001.1","accession_number":null,"cik":null,"ticker":null,"issuer_name":null,"edgar_url":null,"primary_entity_key":null,"primary_entity_name":"NWS Missoula MT"},"word_count":154,"has_tables":false,"body_markdown":"# Frost Advisory: Frost Advisory issued May 18 at 12:00PM MDT until May 19 at 9:00AM MDT by NWS Missoula MT\n\n**Severity:** Minor\n**Certainty:** Likely\n**Urgency:** Expected\n**Areas:** Northern Clearwater Mountains; Southern Clearwater Mountains\n**Issued by:** NWS Missoula MT\n**Sent:** 2026-05-18T12:00:00-06:00\n**Effective:** 2026-05-18T12:00:00-06:00\n**Expires:** 2026-05-19T09:00:00-06:00\n\n## Description\n* WHAT...Temperatures as low as 28 will result in frost formation\nabove 3000 feet. Colder temperatures are expected in the higher\nvalleys.\n\n* WHERE...Southern Clearwater Mountains and Northern Clearwater\nMountains.\n\n* WHEN...From 11 PM this evening to 8 AM PDT Tuesday.\n\n* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive\noutdoor plants may be killed if left uncovered.\n\n* ADDITIONAL DETAILS...Temperature ranges: 30 to 33 Pierce to\nGrangemont area, and 33 to 36 in Elk River. In Idaho County, 28 to\n33 in Powell, 26 to 29 Elk City, and 19 to 25 in both Dixie and Elk\nRiver where a hard freeze is expected.\n\n## Instructions\nTake steps now to protect tender plants from the cold."}