Western Washington residents should prepare for several days of dangerous heat as the National Weather Service has issued a Heat Advisory for most lowland communities beginning Tuesday and continuing through late Wednesday night.
Forecasters expect temperatures to climb into the upper 80s and mid-90s across much of the region Tuesday and Wednesday, with warm overnight lows in the low to mid-60s offering little relief. Urban areas, including the greater Seattle metro, are expected to experience the greatest heat impacts.
The National Weather Service says most of Western Washington will experience Moderate HeatRisk, while some urban neighborhoods and mountain valleys could reach Major HeatRisk because of persistently warm overnight temperatures.
Health officials recommend staying hydrated, limiting strenuous outdoor activities during the hottest part of the day, wearing lightweight clothing, and checking on older adults, young children and neighbors who may be more vulnerable to heat-related illnesses.
In addition to the heat, wildfire smoke from British Columbia is expected to move into northwestern Washington on Monday as Fraser River Valley winds push smoke south. Areas north of Snohomish County are expected to see the greatest impacts, with hazy conditions possibly lingering into Tuesday before onshore winds help clear the air Wednesday.
The prolonged stretch of hot, dry weather is also increasing fire danger across the region. The National Weather Service warns that low humidity and dry vegetation will create elevated fire weather conditions through midweek.
Relief may arrive later in the week as a cooler weather system moves into Western Washington. Forecasters say conditions could become more unsettled beginning Thursday, bringing a chance of showers and thunderstorms. However, the exact timing and location of any storms remains uncertain.
Residents planning outdoor activities are encouraged to monitor the latest forecasts, drink plenty of water, seek shade or air-conditioned spaces when possible, and remain aware of changing weather conditions throughout the week.
