{"url_path":"/weather/alerts/2.49.0.1.840.0.7b8f4c95c8a153d14d6c7b3af8d6c6ac7b349390.003.1","section_key":"alert","section_title":"Heat Advisory issued July 21 at 10:47AM PDT until July 22 at 11:00PM PDT by NWS Portland OR","topic":"weather","document":{"doc_type":"alert","doc_date":"2026-07-21","source_url":"https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.7b8f4c95c8a153d14d6c7b3af8d6c6ac7b349390.003.1","accession_number":null,"cik":null,"ticker":null,"issuer_name":null,"edgar_url":null,"primary_entity_key":null,"primary_entity_name":"NWS Portland OR"},"word_count":356,"has_tables":false,"body_markdown":"# Heat Advisory: Heat Advisory issued July 21 at 10:47AM PDT until July 22 at 11:00PM PDT by NWS Portland OR\n\n**Severity:** Moderate\n**Certainty:** Likely\n**Urgency:** Expected\n**Areas:** Lower Columbia River; Tualatin Valley; West Hills and Chehalem Mountains; Inner Portland Metro; East Portland Metro; Outer Southeast Portland Metro; West Central Willamette Valley; East Central Willamette Valley; West Columbia River Gorge I-84 Corridor; Upper Hood River Valley; Central Columbia River Gorge I-84 Corridor; Cowlitz County Lowlands; North Clark County Lowlands; Inner Vancouver Metro; East Clark County Lowlands; West Columbia River Gorge - SR 14; Central Columbia River Gorge - SR 14\n**Issued by:** NWS Portland OR\n**Sent:** 2026-07-21T10:47:00-07:00\n**Effective:** 2026-07-21T10:47:00-07:00\n**Expires:** 2026-07-22T05:00:00-07:00\n\n## Description\n* WHAT...High temperatures up to 100.\n\n* WHERE...Greater Portland/Vancouver Metro, Western and Central\nColumbia River Gorge and the Hood River Valley, Lower Columbia\nRiver and Cowlitz River Valleys, and Central Willamette Valley.\n\n* WHEN...Until 11 PM PDT Wednesday.\n\n* IMPACTS...Hot temperatures may cause heat illnesses.\n\n* ADDITIONAL DETAILS...Smoke from fires outside of the region or\nclouds moving into the area could result in cooler daytime high\ntemperatures than currently forecast. Around a 10-15% chance of\nthunderstorms on Wednesday afternoon which may increase cloud\ncover and thus cause temperatures to be slightly lower than\nforecast.\n\n## Instructions\nDrink plenty of fluids, stay in a cool place during the heat of the\nday, stay out of the sunshine, and check up on relatives and\nneighbors. For those without air conditioning, use fans to keep air\nmoving. Keeps windows closed during the day and open at night,\nunless air quality is degraded due to wildfire smoke.\n\nTake extra precautions when outside. Wear lightweight and loose\nfitting clothing. Try to limit strenuous activities to early morning\nor evening. Take action when you see symptoms of heat exhaustion and\nheat stroke.\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.\n\nDo not leave young children and pets in unattended vehicles. Car\ninteriors will reach lethal temperatures in a matter of minutes."}