Excessive Heat — Greater Vancouver Area, Washington

2015-06-26 to 2015-06-28 · Greater Vancouver Area, Washington

Event narrative

Afternoon temperatures were in the low to mid 90s which is around 20 degrees higher than the seasonal normals. The low temperatures were in the mid to upper 60s which is around 10 degrees above the seasonal normal. Several new daily temperature records were set for the warmest low temperatures. A man drowned while swimming in the Lewis River on June 27th.

Wider weather episode

A strong upper level ridge of high pressure resulted in hot temperatures across Southwest Washington. Afternoon temperatures peaked in the low to mid 90s which are around 20 degrees warmer than the seasonal normals. Monsoonal moisture and onshore winds resulted in fairly high humidities (40 to 50% in the afternoons) making the temperatures feel 2 to 5 degrees warmer than they were. The mid-level moisture also added to an increase of thunderstorms around the region. Clouds from these thunderstorms limited overnight radiation cooling. Nighttime temperatures were warm with minimum temperatures 10 to 15 degrees warmer than the seasonal normals.

Source: NOAA Storm Events Database, event_id 580573. Narrative written by the NWS forecast office that issued the report.